Package com.smartgwt.client.widgets.tree

# Class ResultTree

java.lang.Object
com.smartgwt.client.core.BaseClass
com.smartgwt.client.data.RecordList
com.smartgwt.client.widgets.tree.Tree
com.smartgwt.client.widgets.tree.ResultTree

All Implemented Interfaces:
  `HasHandlers`, `HasDataChangedHandlers`, `HasDataChangedHandlers`

public class ResultTree extends Tree
ResultTrees are an implementation of the `Tree` API, used to handle hierarchical data, whose nodes are DataSource records which are retrieved from a server.

Modifying ResultTrees

`ResultTree` nodes cannot be directly added or removed from a `paged` `ResultTree` via `Tree` APIs such as `Tree.add()` or `Tree.remove()`, since such trees are considered to be read-only by virtue of containing `ResultSet`s, which are read-only data structures. Even in other `FetchMode`s, calling such APIs will only update the local cache of the ResultTree, rather than triggering any server traffict to update the DataSource.

Use `DataSource.addData()`/`removeData()` to add/remove rows from the `DataSource`, and the `ResultTree` will reflect the changes automatically. Alternatively, the `DataSource.updateCaches()` method may be called to only update local caches of the DataSource in question, without generating any server traffic.

To create a locally modifiable cache of records from a DataSource, you can use `DataSource.fetchData()` to retrieve a List of records which can be modified directly, or you can create a client-only `DataSource` from the retrieved data to share a modifiable cache between several DataBoundComponents.

- ## Nested Class Summary

  ## Nested classes/interfaces inherited from class com.smartgwt.client.data.RecordList

  `RecordList.SortNormalizer`

- ## Field Summary

  ### Fields inherited from class com.smartgwt.client.data.RecordList

  `jsObj`

  ### Fields inherited from class com.smartgwt.client.core.BaseClass

  `config, configOnly, factoryCreated, factoryProperties, id, scClassName`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ResultTree()`
  `ResultTree(JavaScriptObject jsObj)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Tree`
  `applyFilter(Tree tree, Criteria criteria, TreeFilterMode filterMode, DataSource dataSource)`
  The ResultTree will call applyFilter() when it needs to locally filter the tree using the current filter criteria.
  `Tree`
  `applyFilter(Tree tree, Criteria criteria, TreeFilterMode filterMode, DataSource dataSource, DSRequest requestProperties)`
  The ResultTree will call applyFilter() when it needs to locally filter the tree using the current filter criteria.
  `int`
  `compareCriteria(Criteria newCriteria, Criteria oldCriteria)`
  Default behavior is to call `DataSource.compareCriteria()` to determine whether new criteria is equivalent to the old criteria (returns 0) or not.
  `int`
  `compareCriteria(Criteria newCriteria, Criteria oldCriteria, DSRequest requestProperties)`
  Default behavior is to call `DataSource.compareCriteria()` to determine whether new criteria is equivalent to the old criteria (returns 0) or not.
  `JavaScriptObject`
  `create()`
  `void`
  `dataArrived(TreeNode parentNode)`
  This callback fires whenever the resultTree receives new nodes from the server, after the new nodes have been integrated into the tree.
  `TreeNode`
  `get(int pos)`
  Get the item in the openList at a particular position.
  `String`
  `getAutoOpen()`
  Which nodes should be opened automatically - applied whenever `setRoot()` is called, including during initialization and as part of a re-fetch caused, for example, by `duplicate()` or `invalidateCache()`.
  `PreserveOpenState`
  `getAutoPreserveOpenState()`
  Controls what happens to the `"open state"` - the set of nodes opened or closed by the end user after tree data is loaded - when an entirely new tree of nodes is loaded from the server, as a consequence of calling `invalidateCache()` or of changing criteria such that the current cache of nodes is dropped.
  `Boolean`
  `getAutoUpdateSiblingNodesOnDrag()`
  For `multi-link trees`, indicates that we should automatically update the `position` values of old and new sibling records after a drag reparent or reposition-within-parent operation.
  `boolean`
  `getCanReturnOpenFolders()`
  When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, this property specifies the default value assumed for the `canReturnOpenSubfoldersProperty` when no value for that property is provided for a node.
  `String`
  `getCanReturnOpenSubfoldersProperty()`
  When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, `canReturnOpenSubfoldersProperty` may be set on any folder to indicate whether child folders might be returned by the server already open.
  `String`
  `getChildCountProperty()`
  When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, `childCountProperty` must be set for any folders that include only a partial list of children.
  `Criteria`
  `getCombinedCriteria()`
  Returns a copy of all `explicit` and `implicit` criteria currently applied to this `ResultTree`.
  `AdvancedCriteria`
  `getCombinedCriteriaAsAdvancedCriteria()`
  Returns a copy of all `explicit` and `implicit` criteria currently applied to this `ResultTree`.
  `Criteria`
  `getCriteria()`
  The filter criteria to use when fetching rows.
  `TreeNode[]`
  `getData()`
  Optional initial data for the tree.
  `DataSource`
  `getDataSource()`
  What `DataSource` is this resultTree associated with?
  `Boolean`
  `getDefaultIsFolder()`
  Controls whether nodes are assumed to be folders or leaves by default.
  `Boolean`
  `getDefaultNewNodesToRoot()`
  This attribute governs how to handle cache-synch when a new node is added to this dataSource with no explicit parentId.
  `Boolean`
  `getDisableCacheSync()`
  By default when the data of this ResultTree's dataSource is modified, the ResultTree will be updated to display these changes.
  `Boolean`
  `getDiscardParentlessNodes()`
  When data is loaded from the server, should nodes with an explicit value for the `Tree.parentIdField` which doesn't map to a valid parent node be dropped? If set to false, for `TreeGrid.loadDataOnDemand`:false trees, parentless nodes will be added as children of the root node - for `TreeGrid.loadDataOnDemand`:true, they will be added as children of the folder currently requesting children.
  `FetchMode`
  `getFetchMode()`
  Mode of fetching records from server.
  `Integer`
  `getFirstPositionValue()`
  If `autoUpdateSiblingNodesOnDrag` is in force, this is the value we will use to auto-update the position of a node when we cannot derive that value from the existing value of a neighbor.
  `Criteria`
  `getImplicitCriteria()`
  Criteria that are never shown to or edited by the user and are cumulative with any criteria provided via `DataBoundComponent.initialCriteria`, `setCriteria()` etc.
  `Boolean`
  `getKeepParentsOnFilter()`
  If set, tree-based filtering is performed such that parent nodes are kept as long as they have children that match the filter criteria, even if the parents themselves do not match the filter criteria.
  `Integer`
  `getKeepParentsOnFilterMaxNodes()`
  When a tree specifies the combination of `keepParentsOnFilter` and `loadDataOnDemand`, Smart GWT by default automatically fetches the "skeleton" of the filtered tree - see the `keepParentsOnFilter` overview for details, including the definition of "skeleton" and other relevant terminology
  `String`
  `getLinkDataAddOperation()`
  The `operationId` this `ResultTree` should use when performing add operations on its `linkDataSource`.
  `LinkDataFetchMode`
  `getLinkDataFetchMode()`
  The fetch mode for this tree's link data; ignored if this is not a `multi-link tree`
  `String`
  `getLinkDataFetchOperation()`
  The `operationId` this `ResultTree` should use when performing fetch operations on its `linkDataSource`.
  `String`
  `getLinkDataRemoveOperation()`
  The `operationId` this `ResultTree` should use when performing remove operations on its `linkDataSource`.
  `DataSource`
  `getLinkDataSource()`
  This property allows you to specify the dataSource to be used for fetching link information in a databound multilink tree.
  `String`
  `getLinkDataSourceAsString()`
  This property allows you to specify the dataSource to be used for fetching link information in a databound multilink tree.
  `Boolean`
  `getLoadDataOnDemand()`
  Does this resultTree load data incrementally as folders within the tree are opened, or is it all loaded in a single request? Must be true if `fetchMode` is "paged"
  `Integer`
  `getMatchingLeafJoinDepth()`
  This property allows you to specify the number of ancestor levels Smart GWT attempts to retrieve with each request, when using the built-in support for `keepParentsOnFilter` on `loadDataOnDemand` trees.
  `TreeModelType`
  `getModelType()`
  Selects the model used to construct the tree representation.
  `String`
  `getOpenState()`
  Returns a snapshot of the current open state of this tree's data as a `TreeGridOpenState` object.
  `static ResultTree`
  `getOrCreateRef(JavaScriptObject jsObj)`
  `Map`
  `getPaletteDefaults()`
  This method returns a Map of config properties suitable for use as the "defaults" attribute of a `PaletteNode`.
  `Boolean`
  `getProgressiveLoading()`
  Sets `progressive loading mode` for this ResultTree.
  `TreeNode[]`
  `getRange(int start, int end)`
  Get a range of items from the open list
  `Integer`
  `getResultSize()`
  How many tree nodes to retrieve at once from each large set of children in the tree.
  `JavaScriptObject`
  `getRootNode()`
  This attribute may be used to specify a root value for the parentIdField of this resultTree.
  `Boolean`
  `getSendNullParentInLinkDataCriteria()`
  For `multi-link tree`s only, should we send up the `parentId` in fetch criteria if the criteria value is null? If false, we remove the `parentId` from the criteria when `fetching link data`, if the criteria value is null (as it will be by default when fetching the direct child nodes of the tree's root).
  `String[]`
  `getServerFilterFields()`
  For `fetchMode:"local"` ResultTrees, this property lists field names that will be sent to the server if they are present in the criteria.
  `Boolean`
  `getServerKeepParentsOnFilter()`
  If true, indicates that your own server code will handle the complexities associated with the combination of `keepParentsOnFilter` and `loadDataOnDemand`.
  `Boolean`
  `getUpdateCacheFromRequest()`
  When a successful Add, Update or Remove type operation fires on this ResultTree's dataSource, if `DSResponse.data` is unset, should we integrate the submitted data values (from the request) into our data-set?
  `boolean`
  `getUseSimpleCriteriaLOD()`
  Whether or not we should skip promotion of a simple criteria to an `AdvancedCriteria` when sending the `DSRequest` to load the children of a node in a `loadDataOnDemand` or `fetchMode:"paged"` `ResultTree`.
  `void`
  `invalidateCache()`
  Manually invalidate this ResultTree's cache.
  `ResultTree`
  `setAutoOpen(String autoOpen)`
  Which nodes should be opened automatically - applied whenever `setRoot()` is called, including during initialization and as part of a re-fetch caused, for example, by `duplicate()` or `invalidateCache()`.
  `ResultTree`
  `setAutoPreserveOpenState(PreserveOpenState autoPreserveOpenState)`
  Controls what happens to the `"open state"` - the set of nodes opened or closed by the end user after tree data is loaded - when an entirely new tree of nodes is loaded from the server, as a consequence of calling `invalidateCache()` or of changing criteria such that the current cache of nodes is dropped.
  `ResultTree`
  `setAutoUpdateSiblingNodesOnDrag(Boolean autoUpdateSiblingNodesOnDrag)`
  For `multi-link trees`, indicates that we should automatically update the `position` values of old and new sibling records after a drag reparent or reposition-within-parent operation.
  `ResultTree`
  `setCanReturnOpenFolders(boolean canReturnOpenFolders)`
  When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, this property specifies the default value assumed for the `canReturnOpenSubfoldersProperty` when no value for that property is provided for a node.
  `ResultTree`
  `setCanReturnOpenSubfoldersProperty(String canReturnOpenSubfoldersProperty)`
  When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, `canReturnOpenSubfoldersProperty` may be set on any folder to indicate whether child folders might be returned by the server already open.
  `ResultTree`
  `setChildCountProperty(String childCountProperty)`
  When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, `childCountProperty` must be set for any folders that include only a partial list of children.
  `void`
  `setChildren(TreeNode parent, List newChildren)`
  Replaces the existing children of a parent node.
  `void`
  `setChildren(TreeNode parent, List newChildren, Integer totalChildren)`
  Replaces the existing children of a parent node.
  `ResultTree`
  `setCriteria(Criteria criteria)`
  The filter criteria to use when fetching rows.
  `ResultTree`
  `setData(TreeNode... data)`
  Optional initial data for the tree.
  `ResultTree`
  `setDataSource(DataSource dataSource)`
  What `DataSource` is this resultTree associated with?
  `ResultTree`
  `setDefaultIsFolder(Boolean defaultIsFolder)`
  Controls whether nodes are assumed to be folders or leaves by default.
  `ResultTree`
  `setDefaultNewNodesToRoot(Boolean defaultNewNodesToRoot)`
  This attribute governs how to handle cache-synch when a new node is added to this dataSource with no explicit parentId.
  `static void`
  `setDefaultProperties(ResultTree resultTreeProperties)`
  Class level method to set the default properties of this class.
  `ResultTree`
  `setDisableCacheSync(Boolean disableCacheSync)`
  By default when the data of this ResultTree's dataSource is modified, the ResultTree will be updated to display these changes.
  `ResultTree`
  `setDiscardParentlessNodes(Boolean discardParentlessNodes)`
  When data is loaded from the server, should nodes with an explicit value for the `Tree.parentIdField` which doesn't map to a valid parent node be dropped? If set to false, for `TreeGrid.loadDataOnDemand`:false trees, parentless nodes will be added as children of the root node - for `TreeGrid.loadDataOnDemand`:true, they will be added as children of the folder currently requesting children.
  `ResultTree`
  `setFetchMode(FetchMode fetchMode)`
  Mode of fetching records from server.
  `ResultTree`
  `setFirstPositionValue(Integer firstPositionValue)`
  If `autoUpdateSiblingNodesOnDrag` is in force, this is the value we will use to auto-update the position of a node when we cannot derive that value from the existing value of a neighbor.
  `ResultTree`
  `setImplicitCriteria(Criteria implicitCriteria)`
  Criteria that are never shown to or edited by the user and are cumulative with any criteria provided via `DataBoundComponent.initialCriteria`, `setCriteria()` etc.
  `ResultTree`
  `setKeepParentsOnFilter(Boolean keepParentsOnFilter)`
  If set, tree-based filtering is performed such that parent nodes are kept as long as they have children that match the filter criteria, even if the parents themselves do not match the filter criteria.
  `ResultTree`
  `setKeepParentsOnFilterMaxNodes(Integer keepParentsOnFilterMaxNodes)`
  When a tree specifies the combination of `keepParentsOnFilter` and `loadDataOnDemand`, Smart GWT by default automatically fetches the "skeleton" of the filtered tree - see the `keepParentsOnFilter` overview for details, including the definition of "skeleton" and other relevant terminology
  `ResultTree`
  `setLinkDataAddOperation(String linkDataAddOperation)`
  The `operationId` this `ResultTree` should use when performing add operations on its `linkDataSource`.
  `ResultTree`
  `setLinkDataFetchMode(LinkDataFetchMode linkDataFetchMode)`
  The fetch mode for this tree's link data; ignored if this is not a `multi-link tree`
  `ResultTree`
  `setLinkDataFetchOperation(String linkDataFetchOperation)`
  The `operationId` this `ResultTree` should use when performing fetch operations on its `linkDataSource`.
  `ResultTree`
  `setLinkDataRemoveOperation(String linkDataRemoveOperation)`
  The `operationId` this `ResultTree` should use when performing remove operations on its `linkDataSource`.
  `ResultTree`
  `setLinkDataSource(DataSource linkDataSource)`
  This property allows you to specify the dataSource to be used for fetching link information in a databound multilink tree.
  `ResultTree`
  `setLinkDataSource(String linkDataSource)`
  This property allows you to specify the dataSource to be used for fetching link information in a databound multilink tree.
  `ResultTree`
  `setLoadDataOnDemand(Boolean loadDataOnDemand)`
  Does this resultTree load data incrementally as folders within the tree are opened, or is it all loaded in a single request? Must be true if `fetchMode` is "paged"
  `ResultTree`
  `setMatchingLeafJoinDepth(Integer matchingLeafJoinDepth)`
  This property allows you to specify the number of ancestor levels Smart GWT attempts to retrieve with each request, when using the built-in support for `keepParentsOnFilter` on `loadDataOnDemand` trees.
  `ResultTree`
  `setModelType(TreeModelType modelType)`
  Selects the model used to construct the tree representation.
  `void`
  `setOpenState(String openState)`
  Reset the set of open folders within this tree's data to match the `TreeGridOpenState` object passed in.
  `ResultTree`
  `setProgressiveLoading(Boolean progressiveLoading)`
  Sets `progressive loading mode` for this ResultTree.
  `ResultTree`
  `setResultSize(Integer resultSize)`
  How many tree nodes to retrieve at once from each large set of children in the tree.
  `void`
  `setRootNode(JavaScriptObject rootNode)`
  This attribute may be used to specify a root value for the parentIdField of this resultTree.
  `ResultTree`
  `setSendNullParentInLinkDataCriteria(Boolean sendNullParentInLinkDataCriteria)`
  For `multi-link tree`s only, should we send up the `parentId` in fetch criteria if the criteria value is null? If false, we remove the `parentId` from the criteria when `fetching link data`, if the criteria value is null (as it will be by default when fetching the direct child nodes of the tree's root).
  `ResultTree`
  `setServerFilterFields(String... serverFilterFields)`
  For `fetchMode:"local"` ResultTrees, this property lists field names that will be sent to the server if they are present in the criteria.
  `ResultTree`
  `setServerKeepParentsOnFilter(Boolean serverKeepParentsOnFilter)`
  If true, indicates that your own server code will handle the complexities associated with the combination of `keepParentsOnFilter` and `loadDataOnDemand`.
  `ResultTree`
  `setUpdateCacheFromRequest(Boolean updateCacheFromRequest)`
  When a successful Add, Update or Remove type operation fires on this ResultTree's dataSource, if `DSResponse.data` is unset, should we integrate the submitted data values (from the request) into our data-set?
  `ResultTree`
  `setUseSimpleCriteriaLOD(boolean useSimpleCriteriaLOD)`
  Whether or not we should skip promotion of a simple criteria to an `AdvancedCriteria` when sending the `DSRequest` to load the children of a node in a `loadDataOnDemand` or `fetchMode:"paged"` `ResultTree`.
  `void`
  `unloadChildren(TreeNode node)`
  Deprecated.
  It's recommended that you instead use `Tree.reloadChildren()` to reload the children of a folder, or `Tree.removeChildren()` if you need to clear the cached children of a folder to add specific local data.
  `Boolean`
  `willFetchData(Criteria newCriteria)`
  Will changing the criteria for this resultTree require fetching new data from the server or can the new criteria be satisfied from data already cached on the client?

  ### Methods inherited from class com.smartgwt.client.widgets.tree.Tree

  `add, add, add, add, addDataChangedHandler, addList, addList, addList, addList, allChildrenLoaded, closeAll, closeAll, closeAll, closeFolder, closeFolder, closeFolder, closeFolder, closeFolders, createNodeLocator, createNodeLocator, discoverTree, find, find, find, findById, findChildrenProperty, findIndex, findIndex, findIndex, findIndex, findNextIndex, findNextIndex, findNextIndex, findNextNodeIndex, findNextNodeIndex, findNextNodeIndex, findNodeIndex, findNodeIndex, findNodeIndex, findNodeIndex, getAllNodes, getAllNodes, getAllowFilterOnLinkFields, getAutoOpenRoot, getChildren, getChildrenProperty, getChildrenResultSet, getDataSourceAsString, getDefaultNodeTitle, getDescendantFolders, getDescendantFolders, getDescendantLeaves, getDescendantLeaves, getDescendantNodeLocators, getDescendantNodeLocators, getDescendants, getDescendants, getFilteredTree, getFilteredTree, getFolders, getIdField, getIsFolderProperty, getLeaves, getLength, getLevel, getLevel, getLinkData, getLinkPositionField, getLoadState, getMultiLinkParents, getName, getName, getNameProperty, getNodeLocator, getOpenList, getOpenProperty, getParent, getParentIdField, getParentPath, getParents, getParentsAndPositions, getPath, getPathDelim, getPathForOpenListIndex, getReportCollisions, getRoot, getRootValue, getSeparateFolders, getShowRoot, getSortFoldersBeforeLeaves, getTitle, getTitleProperty, hasChildren, hasFolders, hasLeaves, isDescendantOf, isFolder, isInAncestorChain, isLeaf, isLoaded, isMultiLinkTree, isOpen, isOpen, isOpen, isOpen, isParent, isRoot, linkDataChanged, linkNodes, loadChildren, loadChildren, move, move, nodeForRecord, openAll, openAll, openAll, openAll, openAll, openFolder, openFolders, reloadChildren, remove, remove, remove, remove, removeChildren, removeList, setAllowFilterOnLinkFields, setAutoOpenRoot, setChildrenProperty, setDataSource, setDefaultNodeTitle, setDefaultProperties, setIdField, setIsFolderProperty, setJavaScriptObject, setLinkData, setLinkPositionField, setMultiLinkTree, setNameProperty, setOpenProperty, setParentIdField, setPathDelim, setReportCollisions, setRoot, setRootValue, setRootValue, setSeparateFolders, setShowRoot, setSortFoldersBeforeLeaves, setTitleProperty`

  ### Methods inherited from class com.smartgwt.client.data.RecordList

  `add, addAt, addDataChangedHandler, addList, addList, addListAt, contains, contains, containsAll, duplicate, equals, find, find, find, findAll, findAll, findAll, findAll, findAll, findAll, findAll, findAll, findIndex, findIndex, findIndex, findIndex, findIndex, findIndex, findNextIndex, findNextIndex, findNextIndex, findNextIndex, findNextIndex, findNextIndex, findNextIndex, findNextIndex, findNextIndex, first, getItems, getJsObj, getOrCreateJsObj, getProperty, getRangeList, getValueMap, indexOf, indexOf, intersect, isARecordList, isCreated, isEmpty, last, lastIndexOf, lastIndexOf, remove, removeAt, removeList, set, setLength, setSort, sort, sort, sortByProperty, sortByProperty, toArray`

  ### Methods inherited from class com.smartgwt.client.core.BaseClass

  `addDynamicProperty, addDynamicProperty, addDynamicProperty, addDynamicProperty, applyFactoryProperties, asSGWTComponent, clearDynamicProperty, createJsObj, destroy, doAddHandler, doInit, error, error, errorIfNotCreated, fireEvent, getAttribute, getAttributeAsBoolean, getAttributeAsDate, getAttributeAsDouble, getAttributeAsElement, getAttributeAsFloat, getAttributeAsInt, getAttributeAsJavaScriptObject, getAttributeAsMap, getAttributeAsString, getAttributeAsStringArray, getClassName, getConfig, getHandlerCount, getID, getRef, getRuleScope, getScClassName, getTestInstance, hasAutoAssignedID, hasDynamicProperty, internalSetID, internalSetID, isConfigOnly, isFactoryCreated, onBind, onInit, registerID, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAutoID, setConfig, setConfigOnly, setFactoryCreated, setID, setProperty, setProperty, setProperty, setProperty, setRuleScope, setScClassName`

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

  ### Methods inherited from interface com.google.gwt.event.shared.HasHandlers

  `fireEvent`

- ## Constructor Details

  - ### ResultTree

    public ResultTree()

  - ### ResultTree

    public ResultTree(JavaScriptObject jsObj)

- ## Method Details

  - ### getOrCreateRef

    public static ResultTree getOrCreateRef(JavaScriptObject jsObj)

  - ### getPaletteDefaults

    public Map getPaletteDefaults()
    This method returns a Map of config properties suitable for use as the "defaults" attribute of a `PaletteNode`. Use it when you need to work with PaletteNodes indirectly, such when setting up `TileRecord`s that will be used in a `TilePalette`. See `the dev tools overview` for examples of how to assemble and acquire a suitable defaults object when you are creating a PaletteNode indirectly

  - ### create

    public JavaScriptObject create()
    Overrides:
      `create` in class `Tree`

  - ### setAutoOpen

    public ResultTree setAutoOpen(String autoOpen)
    Which nodes should be opened automatically - applied whenever `setRoot()` is called, including during initialization and as part of a re-fetch caused, for example, by `duplicate()` or `invalidateCache()`.

    Options are:

    - "none" - no nodes are opened automatically
    - "root" - opens the `top-level node` - in databound trees, this node is always hidden
    - "all" - when `loading data on demand`, opens the `top-level node` and all of it's direct descendants - otherwise, opens all loaded nodes
    Parameters:
      `autoOpen` - New autoOpen value. Default value is "none"
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getAutoOpen

    public String getAutoOpen()
    Which nodes should be opened automatically - applied whenever `setRoot()` is called, including during initialization and as part of a re-fetch caused, for example, by `duplicate()` or `invalidateCache()`.

    Options are:

    - "none" - no nodes are opened automatically
    - "root" - opens the `top-level node` - in databound trees, this node is always hidden
    - "all" - when `loading data on demand`, opens the `top-level node` and all of it's direct descendants - otherwise, opens all loaded nodes
    Returns:
      Current autoOpen value. Default value is "none"

  - ### setAutoPreserveOpenState

    public ResultTree setAutoPreserveOpenState(PreserveOpenState autoPreserveOpenState)
    Controls what happens to the `"open state"` - the set of nodes opened or closed by the end user after tree data is loaded - when an entirely new tree of nodes is loaded from the server, as a consequence of calling `invalidateCache()` or of changing criteria such that the current cache of nodes is dropped.
    Parameters:
      `autoPreserveOpenState` - New autoPreserveOpenState value. Default value is "whenUnique"
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getAutoPreserveOpenState

    public PreserveOpenState getAutoPreserveOpenState()
    Controls what happens to the `"open state"` - the set of nodes opened or closed by the end user after tree data is loaded - when an entirely new tree of nodes is loaded from the server, as a consequence of calling `invalidateCache()` or of changing criteria such that the current cache of nodes is dropped.
    Returns:
      Current autoPreserveOpenState value. Default value is "whenUnique"

  - ### setAutoUpdateSiblingNodesOnDrag

    public ResultTree setAutoUpdateSiblingNodesOnDrag(Boolean autoUpdateSiblingNodesOnDrag) throws IllegalStateException
    For `multi-link trees`, indicates that we should automatically update the `position` values of old and new sibling records after a drag reparent or reposition-within-parent operation. For example, say you have a tree like this (where the number in parentheses indicates the node's `position` value):

               A
                 - B (1)
                 - C (2)
                 - D (3)
               E
                 - F (1)
                 - G (2)

    and you drag node C out and drop it between nodes F and G. This drag operation will spawn two update operations to the server: a "remove" to delete node C from parent A, and an "add" to re-add it under parent E. With `autoUpdateSiblingNodesOnDrag` in force, we also automatically issue two "update" operations to the server - one to change the position on node D to 2, and another to change the position on node G to 3. The end result of this is that node position values are kept correct.

    Please note the following:

    - As noted above, these automatic updates are persistent - we send a queue of actual update requests to the server. This is convenient, but it may not be terribly efficient, particularly if you have just dropped a node at the head of a list of several hundred siblings. This is why we do not default this setting to true
    - The automatic updates work by applying an integer delta value to the existing position value. So in the above example, we would compute a delta of negative 1 for node D and positive 1 for node G. The upshot of this is that `autoUpdateSiblingNodesOnDrag` only works well if your position values are consecutive integers
    Parameters:
      `autoUpdateSiblingNodesOnDrag` - New autoUpdateSiblingNodesOnDrag value. Default value is (see below)
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getAutoUpdateSiblingNodesOnDrag

    public Boolean getAutoUpdateSiblingNodesOnDrag()
    For `multi-link trees`, indicates that we should automatically update the `position` values of old and new sibling records after a drag reparent or reposition-within-parent operation. For example, say you have a tree like this (where the number in parentheses indicates the node's `position` value):

               A
                 - B (1)
                 - C (2)
                 - D (3)
               E
                 - F (1)
                 - G (2)

    and you drag node C out and drop it between nodes F and G. This drag operation will spawn two update operations to the server: a "remove" to delete node C from parent A, and an "add" to re-add it under parent E. With `autoUpdateSiblingNodesOnDrag` in force, we also automatically issue two "update" operations to the server - one to change the position on node D to 2, and another to change the position on node G to 3. The end result of this is that node position values are kept correct.

    Please note the following:

    - As noted above, these automatic updates are persistent - we send a queue of actual update requests to the server. This is convenient, but it may not be terribly efficient, particularly if you have just dropped a node at the head of a list of several hundred siblings. This is why we do not default this setting to true
    - The automatic updates work by applying an integer delta value to the existing position value. So in the above example, we would compute a delta of negative 1 for node D and positive 1 for node G. The upshot of this is that `autoUpdateSiblingNodesOnDrag` only works well if your position values are consecutive integers
    Returns:
      Current autoUpdateSiblingNodesOnDrag value. Default value is (see below)

  - ### setCanReturnOpenFolders

    public ResultTree setCanReturnOpenFolders(boolean canReturnOpenFolders) throws IllegalStateException
    When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, this property specifies the default value assumed for the `canReturnOpenSubfoldersProperty` when no value for that property is provided for a node.
    Parameters:
      `canReturnOpenFolders` - New canReturnOpenFolders value. Default value is false
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getCanReturnOpenFolders

    public boolean getCanReturnOpenFolders()
    When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, this property specifies the default value assumed for the `canReturnOpenSubfoldersProperty` when no value for that property is provided for a node.
    Returns:
      Current canReturnOpenFolders value. Default value is false

  - ### setCanReturnOpenSubfoldersProperty

    public ResultTree setCanReturnOpenSubfoldersProperty(String canReturnOpenSubfoldersProperty) throws IllegalStateException
    When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, `canReturnOpenSubfoldersProperty` may be set on any folder to indicate whether child folders might be returned by the server already open. If the property is set to false on a folder then subfolders of that folder are never allowed to be returned already open. This enables the paging mechanism to be more efficient in the amount of data that it requests from the server.

    For example, setting the `canReturnOpenSubfoldersProperty` value to `false` on a node is appropriate if the server-side code determines that the the node's children consist of entirely leaf nodes.

    Parameters:
      `canReturnOpenSubfoldersProperty` - New canReturnOpenSubfoldersProperty value. Default value is "canReturnOpenSubfolders"
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - `setCanReturnOpenFolders(boolean)`

  - ### getCanReturnOpenSubfoldersProperty

    public String getCanReturnOpenSubfoldersProperty()
    When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, `canReturnOpenSubfoldersProperty` may be set on any folder to indicate whether child folders might be returned by the server already open. If the property is set to false on a folder then subfolders of that folder are never allowed to be returned already open. This enables the paging mechanism to be more efficient in the amount of data that it requests from the server.

    For example, setting the `canReturnOpenSubfoldersProperty` value to `false` on a node is appropriate if the server-side code determines that the the node's children consist of entirely leaf nodes.

    Returns:
      Current canReturnOpenSubfoldersProperty value. Default value is "canReturnOpenSubfolders"
    See Also:
      - `getCanReturnOpenFolders()`

  - ### setChildCountProperty

    public ResultTree setChildCountProperty(String childCountProperty) throws IllegalStateException
    When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, `childCountProperty` must be set for any folders that include only a partial list of children. For a deeper discussion see the Paging large sets of children section of the `TreeDataBinding` overview.
    Parameters:
      `childCountProperty` - New childCountProperty value. Default value is "childCount"
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - Multi-Level Child Paging Example

  - ### getChildCountProperty

    public String getChildCountProperty()
    When using `fetchMode:"paged"` and providing multiple levels of the tree in one DSResponse, `childCountProperty` must be set for any folders that include only a partial list of children. For a deeper discussion see the Paging large sets of children section of the `TreeDataBinding` overview.
    Returns:
      Current childCountProperty value. Default value is "childCount"
    See Also:
      - Multi-Level Child Paging Example

  - ### setCriteria

    public ResultTree setCriteria(Criteria criteria)
    The filter criteria to use when fetching rows. For usage see `setCriteria()`.
    If this method is called after the component has been drawn/initialized: Set the filter criteria to use when fetching rows.

    Depending on the result of `compareCriteria()` and setting for `fetchMode`, setting criteria may cause a trip to the server to get a new set of nodes, or may simply cause already-fetched nodes to be re-filtered according to the new criteria.

    For a basic overview on when server fetches are generally performed, see `fetchMode`. However, this is not the final determination of when server fetches occur. Criteria can be split into local criteria and server criteria by specifying `serverFilterFields`. Thus, even when using fetchMode:"local" a new server fetch will occur if the server criteria changes. For details on how the criteria is split, see `DataSource.splitCriteria()`.

    Note: if criteria is being split to retrieve server criteria portion and the criteria is an `AdvancedCriteria`, the criteria must consist of a single "and" operator and one or more simple criteria below it. No other logical operators may be used. In other words, the `AdvancedCriteria` provided must be exactly representable by a simple criteria.

    Parameters:
      `criteria` - the filter criteria. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getCriteria

    public Criteria getCriteria()
    The filter criteria to use when fetching rows. For usage see `setCriteria()`.
    Returns:
      Current criteria value. Default value is null

  - ### setData

    public ResultTree setData(TreeNode... data) throws IllegalStateException
    Optional initial data for the tree. If the `fetchMode` is `"basic"` or `"local"` then the format of this data is exactly the same `parentId`-linked list of tree nodes as documented on `Tree.data` (when the `modelType` is set to `"parent"`). If the `fetchMode` is `"paged"` then the format is extended to allow the `childCountProperty` to be set on folder nodes.

    Providing an initial set of nodes in this way does not affect the behavior of the ResultTree in its loading of unloaded folders. An equivalent result is achieved if the first fetch from the server returns this same data.

    If `fetchMode` is `"paged"` then you may make folder-by-folder choices as to whether to use paging for the childen of each folder. If you would like to use paging in a folder then you may include a partial list of that folder's children with the data, provided that you set the `childCountProperty` to the total number of children. Otherwise you will need to include either all children of the folder or none of the children. Open folders without any children provided will cause immediate, new fetches for the children, as usual.

    Because the initial data is treated exactly as though it were returned from the tree's first server fetch, the order of the initial data must match the initial sort order of the TreeGrid displaying the data or, if no such sort is specified, the native storage order on the server. For example, consider initial data containing `n` records having the `parentId` `"X"`, meaning they are all in the same folder. These `n` records are the records at indices `0` through `(n - 1)` that are stored on the server under the parent node. If the `childCountProperty` set on the parent node indicates that there are `m > n` total rows under the parent node then the records at indices `n` to `(m - 1)` will be fetched from the server as the user scrolls the additional rows into view.

    Note : This is an advanced setting

    Overrides:
      `setData` in class `Tree`
    Parameters:
      `data` - New data value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - `Tree.setData(com.smartgwt.client.widgets.tree.TreeNode[])`
      - `TreeNode`
      - `Tree DataBinding`

  - ### getData

    public TreeNode[] getData()
    Optional initial data for the tree. If the `fetchMode` is `"basic"` or `"local"` then the format of this data is exactly the same `parentId`-linked list of tree nodes as documented on `Tree.data` (when the `modelType` is set to `"parent"`). If the `fetchMode` is `"paged"` then the format is extended to allow the `childCountProperty` to be set on folder nodes.

    Providing an initial set of nodes in this way does not affect the behavior of the ResultTree in its loading of unloaded folders. An equivalent result is achieved if the first fetch from the server returns this same data.

    If `fetchMode` is `"paged"` then you may make folder-by-folder choices as to whether to use paging for the childen of each folder. If you would like to use paging in a folder then you may include a partial list of that folder's children with the data, provided that you set the `childCountProperty` to the total number of children. Otherwise you will need to include either all children of the folder or none of the children. Open folders without any children provided will cause immediate, new fetches for the children, as usual.

    Because the initial data is treated exactly as though it were returned from the tree's first server fetch, the order of the initial data must match the initial sort order of the TreeGrid displaying the data or, if no such sort is specified, the native storage order on the server. For example, consider initial data containing `n` records having the `parentId` `"X"`, meaning they are all in the same folder. These `n` records are the records at indices `0` through `(n - 1)` that are stored on the server under the parent node. If the `childCountProperty` set on the parent node indicates that there are `m > n` total rows under the parent node then the records at indices `n` to `(m - 1)` will be fetched from the server as the user scrolls the additional rows into view.

    Overrides:
      `getData` in class `Tree`
    Returns:
      Current data value. Default value is null
    See Also:
      - `Tree.getData()`
      - `TreeNode`
      - `Tree DataBinding`

  - ### setDefaultIsFolder

    public ResultTree setDefaultIsFolder(Boolean defaultIsFolder) throws IllegalStateException
    Controls whether nodes are assumed to be folders or leaves by default.

    Nodes that have children or have the `isFolderProperty` set to true will always be considered folders. Other nodes will be considered folders or leaves by default according to this setting.

    If `defaultIsFolder` is unset, the ResultTree will automatically set it to match the value of `loadDataOnDemand`. This means that, when using folder-by-folder load on demand (`loadDataOnDemand:true`), by default a newly loaded node will be considered to be a folder that has not loaded its children yet.

    When not using folder-by-folder load on demand, by default a newly loaded node is considered a leaf. If you set `defaultIsFolder:true` explicitly, by default a newly loaded node is considered to be a folder with no children.

    See `Tree.isFolder()` for details on how to explicitly mark nodes as folders or leaves.

    Overrides:
      `setDefaultIsFolder` in class `Tree`
    Parameters:
      `defaultIsFolder` - New defaultIsFolder value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - `TreeGrid.setLoadDataOnDemand(java.lang.Boolean)`

  - ### getDefaultIsFolder

    public Boolean getDefaultIsFolder()
    Controls whether nodes are assumed to be folders or leaves by default.

    Nodes that have children or have the `isFolderProperty` set to true will always be considered folders. Other nodes will be considered folders or leaves by default according to this setting.

    If `defaultIsFolder` is unset, the ResultTree will automatically set it to match the value of `loadDataOnDemand`. This means that, when using folder-by-folder load on demand (`loadDataOnDemand:true`), by default a newly loaded node will be considered to be a folder that has not loaded its children yet.

    When not using folder-by-folder load on demand, by default a newly loaded node is considered a leaf. If you set `defaultIsFolder:true` explicitly, by default a newly loaded node is considered to be a folder with no children.

    See `Tree.isFolder()` for details on how to explicitly mark nodes as folders or leaves.

    Overrides:
      `getDefaultIsFolder` in class `Tree`
    Returns:
      Current defaultIsFolder value. Default value is null
    See Also:
      - `TreeGrid.getLoadDataOnDemand()`

  - ### setDefaultNewNodesToRoot

    public ResultTree setDefaultNewNodesToRoot(Boolean defaultNewNodesToRoot)
    This attribute governs how to handle cache-synch when a new node is added to this dataSource with no explicit parentId.

    If set to `true`, when a new node is added to this dataSource via `DataSource.addData()`, with no explicit parentId, the node will be added as a child of the root node of this result tree. Otherwise it will be ignored.

    Similar logic applies to `updated nodes` - if this property is true and the parentId of an updated node is cleared, it will be moved to become a child of root, otherwise it will be dropped from the tree.

    Note : This is an advanced setting

    Parameters:
      `defaultNewNodesToRoot` - New defaultNewNodesToRoot value. Default value is false
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getDefaultNewNodesToRoot

    public Boolean getDefaultNewNodesToRoot()
    This attribute governs how to handle cache-synch when a new node is added to this dataSource with no explicit parentId.

    If set to `true`, when a new node is added to this dataSource via `DataSource.addData()`, with no explicit parentId, the node will be added as a child of the root node of this result tree. Otherwise it will be ignored.

    Similar logic applies to `updated nodes` - if this property is true and the parentId of an updated node is cleared, it will be moved to become a child of root, otherwise it will be dropped from the tree.

    Returns:
      Current defaultNewNodesToRoot value. Default value is false

  - ### setDisableCacheSync

    public ResultTree setDisableCacheSync(Boolean disableCacheSync) throws IllegalStateException
    By default when the data of this ResultTree's dataSource is modified, the ResultTree will be updated to display these changes. Set this flag to true to disable this behavior.

    Note : This is an advanced setting

    Parameters:
      `disableCacheSync` - New disableCacheSync value. Default value is false
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getDisableCacheSync

    public Boolean getDisableCacheSync()
    By default when the data of this ResultTree's dataSource is modified, the ResultTree will be updated to display these changes. Set this flag to true to disable this behavior.
    Returns:
      Current disableCacheSync value. Default value is false

  - ### setDiscardParentlessNodes

    public ResultTree setDiscardParentlessNodes(Boolean discardParentlessNodes) throws IllegalStateException
    When data is loaded from the server, should nodes with an explicit value for the `Tree.parentIdField` which doesn't map to a valid parent node be dropped? If set to false, for `TreeGrid.loadDataOnDemand`:false trees, parentless nodes will be added as children of the root node - for `TreeGrid.loadDataOnDemand`:true, they will be added as children of the folder currently requesting children.

    This effectively allows nodes to be loaded into the current (or root) folder without needing an explicit `parentIdField value` that matches the folder's ID or `rootValue` for the resultTree.

    Note: For `loadDataOnDemand:false` trees, if this property is unset at init time, it will default to `true` if an explicit `rootNode` has been specified. This ensures that if the data tree retrieved from the server includes ancestors of the desired root-node we don't display them. Otherwise this property always defaults to false.

    Note : This is an advanced setting

    Overrides:
      `setDiscardParentlessNodes` in class `Tree`
    Parameters:
      `discardParentlessNodes` - New discardParentlessNodes value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getDiscardParentlessNodes

    public Boolean getDiscardParentlessNodes()
    When data is loaded from the server, should nodes with an explicit value for the `Tree.parentIdField` which doesn't map to a valid parent node be dropped? If set to false, for `TreeGrid.loadDataOnDemand`:false trees, parentless nodes will be added as children of the root node - for `TreeGrid.loadDataOnDemand`:true, they will be added as children of the folder currently requesting children.

    This effectively allows nodes to be loaded into the current (or root) folder without needing an explicit `parentIdField value` that matches the folder's ID or `rootValue` for the resultTree.

    Note: For `loadDataOnDemand:false` trees, if this property is unset at init time, it will default to `true` if an explicit `rootNode` has been specified. This ensures that if the data tree retrieved from the server includes ancestors of the desired root-node we don't display them. Otherwise this property always defaults to false.

    Overrides:
      `getDiscardParentlessNodes` in class `Tree`
    Returns:
      Current discardParentlessNodes value. Default value is null

  - ### setFetchMode

    public ResultTree setFetchMode(FetchMode fetchMode) throws IllegalStateException
    Mode of fetching records from server.

    fetchMode:"local" implies that local filtering will always be performed. See `keepParentsOnFilter` for additional filtering details.

    fetchMode:"basic" or "paged" implies that if search criteria change, the entire tree will be discarded and re-fetched from the server. When retrieving the replacement tree data, the default behavior will be to preserve the `openState` for any nodes that the server returns which were previously opened by the user. Note that this implies that if `loadDataOnDemand` is enabled and the server returns only root-level nodes, open state will be preserved only for root-level nodes, and children of open root-level nodes will be immediately fetched from the server if they are not included in the server's initial response.

    fetchMode:"paged" enables paging for nodes that have very large numbers of children. Whenever the children of a folder are loaded, the `resultTree` will set `DSRequest.startRow` and `endRow` when requesting children from the DataSource, and will manage loading of further children on demand, similar to how a `ResultSet` manages paging for lists. For a deeper discussion see the Paging large sets of children section of the `TreeDataBinding` overview.

    Parameters:
      `fetchMode` - New fetchMode value. Default value is "basic"
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - `setLoadDataOnDemand(java.lang.Boolean)`
      - `setUseSimpleCriteriaLOD(boolean)`
      - `Tree DataBinding`
      - Paging for Children Example

  - ### getFetchMode

    public FetchMode getFetchMode()
    Mode of fetching records from server.

    fetchMode:"local" implies that local filtering will always be performed. See `keepParentsOnFilter` for additional filtering details.

    fetchMode:"basic" or "paged" implies that if search criteria change, the entire tree will be discarded and re-fetched from the server. When retrieving the replacement tree data, the default behavior will be to preserve the `openState` for any nodes that the server returns which were previously opened by the user. Note that this implies that if `loadDataOnDemand` is enabled and the server returns only root-level nodes, open state will be preserved only for root-level nodes, and children of open root-level nodes will be immediately fetched from the server if they are not included in the server's initial response.

    fetchMode:"paged" enables paging for nodes that have very large numbers of children. Whenever the children of a folder are loaded, the `resultTree` will set `DSRequest.startRow` and `endRow` when requesting children from the DataSource, and will manage loading of further children on demand, similar to how a `ResultSet` manages paging for lists. For a deeper discussion see the Paging large sets of children section of the `TreeDataBinding` overview.

    Returns:
      Current fetchMode value. Default value is "basic"
    See Also:
      - `getLoadDataOnDemand()`
      - `getUseSimpleCriteriaLOD()`
      - `Tree DataBinding`
      - Paging for Children Example

  - ### setFirstPositionValue

    public ResultTree setFirstPositionValue(Integer firstPositionValue)
    If `autoUpdateSiblingNodesOnDrag` is in force, this is the value we will use to auto-update the position of a node when we cannot derive that value from the existing value of a neighbor. This happens when a node is dropped into the very first position below a parent (including the special case of the parent being previously empty)
    Parameters:
      `firstPositionValue` - New firstPositionValue value. Default value is 1
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getFirstPositionValue

    public Integer getFirstPositionValue()
    If `autoUpdateSiblingNodesOnDrag` is in force, this is the value we will use to auto-update the position of a node when we cannot derive that value from the existing value of a neighbor. This happens when a node is dropped into the very first position below a parent (including the special case of the parent being previously empty)
    Returns:
      Current firstPositionValue value. Default value is 1

  - ### setImplicitCriteria

    public ResultTree setImplicitCriteria(Criteria implicitCriteria)
    Criteria that are never shown to or edited by the user and are cumulative with any criteria provided via `DataBoundComponent.initialCriteria`, `setCriteria()` etc.
    Parameters:
      `implicitCriteria` - New implicitCriteria value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getImplicitCriteria

    public Criteria getImplicitCriteria()
    Criteria that are never shown to or edited by the user and are cumulative with any criteria provided via `DataBoundComponent.initialCriteria`, `setCriteria()` etc.
    Returns:
      Current implicitCriteria value. Default value is null

  - ### setKeepParentsOnFilter

    public ResultTree setKeepParentsOnFilter(Boolean keepParentsOnFilter) throws IllegalStateException
    If set, tree-based filtering is performed such that parent nodes are kept as long as they have children that match the filter criteria, even if the parents themselves do not match the filter criteria. If not set, filtering will exclude parent nodes not matching the criteria, and all nodes below them in the tree.

    If some criteria must be sent to the server in order to produce a valid tree of data, but `keepParentsOnFilter` is also required, the `serverFilterFields` attribute may be used to specify a list of field names that will be sent to the server whenever they are present in the criteria. Note that for the subset of criteria applied to these fields, `keepParentsInFilter` behavior will not occur without custom logic in the DataSource fetch operation.

    If `FetchMode` is explicitly set to `"paged"`, it is not possible to implement `keepParentsOnFilter`, either by local filtering or with the automatic client-driven handling mentioned below. Support for `keepParentsOnFilter` for a paged ResultTree therefore also requires custom logic in the DataSource fetch operation. To support this a developer must ensure that their fetch operation returns the appropriate set of nodes - all nodes that match the specified criteria plus their ancestor nodes even if they do not match the specified criteria.

    ### keepParentsOnFilter with load-on-demand trees

    The combination of `keepParentsOnFilter` and `loadDataOnDemand` presents additional difficulties that require special handling. The problem is that in order to determine even the top-level folders, you have to examine every node in the entire tree. For example, say there is one top-level folder that has thousands of folders and nodes underneath it, and there is just one leaf node, 6 levels deep, that matches the filter criteria. You have to find out about that node, because it implies the top-level folder must be retained.

    So the server basically has to examine every node in the dataset to determine even what shows up at the top level of the tree. If it does not do this, parent nodes that don't match the filter criteria will be excluded from the tree, with the upshot that the child nodes that do match the criteria will be inaccessible because nodes in load-on-demand trees are only loaded when their parent node is opened

    By default, Smart GWT solves this with a client-driven implementation of this special handling. This algorithm involves finding the nodes that match the filter criteria - which we term matching leaves - and then recursively travelling back up the tree, determining the ancestors of the matching leaves - the so-called dangling parents. When we have traversed all the way back to the root node from every matching leaf, we have recorded every dangling parent and have what we term the skeleton of the tree. The skeleton is then added to fetch criteria whenever a load-on-demand fetch request is made, ensuring that we fetch both dangling parents and matching leaves.

    There are three ways this recursive traversal can be implemented:

    - For dataSources that `support dynamic tree joins`, we use the `additionalOutputs` feature to declare self-joins that fetch multiple levels of parent in one query (the number of levels is configurable, see `matchingLeafJoinDepth`). Of Smart GWT's built-in DataSource types, only SQLDataSource is currently capable of this approach
    - For server-side dataSources that do not support self-joins, we combine individual single-level fetches into a `queue`, using `fieldValueExpressions` with `responseData "allRecords"` so that each fetch in the queue uses the output of the previous fetch as its criteria (so the first fetch returns the parents of the matching nodes, the second fetch returns the parents of those nodes, and so on). Again, the number of fetches per queue can be configured with the `matchingLeafJoinDepth` property. This approach works for any server-side DataSource implementation, including your own custom implementations
    - For `client-side` dataSources, which support neither self-joins not queueing, the algorithm simply makes as many single-level requests as necessary to build the entire skeleton. Note, this is exactly what would happen with previously-mentioned queueing approach, if you set `matchingLeafJoinDepth` to 1
    If you want to disable the automatic handling of `keepParentsOnFilter` on load-on-demand trees, see `serverKeepParentsOnFilter`
    Parameters:
      `keepParentsOnFilter` - New keepParentsOnFilter value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - `setKeepParentsOnFilterMaxNodes(java.lang.Integer)`
      - `Tree DataBinding`

  - ### getKeepParentsOnFilter

    public Boolean getKeepParentsOnFilter()
    If set, tree-based filtering is performed such that parent nodes are kept as long as they have children that match the filter criteria, even if the parents themselves do not match the filter criteria. If not set, filtering will exclude parent nodes not matching the criteria, and all nodes below them in the tree.

    If some criteria must be sent to the server in order to produce a valid tree of data, but `keepParentsOnFilter` is also required, the `serverFilterFields` attribute may be used to specify a list of field names that will be sent to the server whenever they are present in the criteria. Note that for the subset of criteria applied to these fields, `keepParentsInFilter` behavior will not occur without custom logic in the DataSource fetch operation.

    If `FetchMode` is explicitly set to `"paged"`, it is not possible to implement `keepParentsOnFilter`, either by local filtering or with the automatic client-driven handling mentioned below. Support for `keepParentsOnFilter` for a paged ResultTree therefore also requires custom logic in the DataSource fetch operation. To support this a developer must ensure that their fetch operation returns the appropriate set of nodes - all nodes that match the specified criteria plus their ancestor nodes even if they do not match the specified criteria.

    ### keepParentsOnFilter with load-on-demand trees

    The combination of `keepParentsOnFilter` and `loadDataOnDemand` presents additional difficulties that require special handling. The problem is that in order to determine even the top-level folders, you have to examine every node in the entire tree. For example, say there is one top-level folder that has thousands of folders and nodes underneath it, and there is just one leaf node, 6 levels deep, that matches the filter criteria. You have to find out about that node, because it implies the top-level folder must be retained.

    So the server basically has to examine every node in the dataset to determine even what shows up at the top level of the tree. If it does not do this, parent nodes that don't match the filter criteria will be excluded from the tree, with the upshot that the child nodes that do match the criteria will be inaccessible because nodes in load-on-demand trees are only loaded when their parent node is opened

    By default, Smart GWT solves this with a client-driven implementation of this special handling. This algorithm involves finding the nodes that match the filter criteria - which we term matching leaves - and then recursively travelling back up the tree, determining the ancestors of the matching leaves - the so-called dangling parents. When we have traversed all the way back to the root node from every matching leaf, we have recorded every dangling parent and have what we term the skeleton of the tree. The skeleton is then added to fetch criteria whenever a load-on-demand fetch request is made, ensuring that we fetch both dangling parents and matching leaves.

    There are three ways this recursive traversal can be implemented:

    - For dataSources that `support dynamic tree joins`, we use the `additionalOutputs` feature to declare self-joins that fetch multiple levels of parent in one query (the number of levels is configurable, see `matchingLeafJoinDepth`). Of Smart GWT's built-in DataSource types, only SQLDataSource is currently capable of this approach
    - For server-side dataSources that do not support self-joins, we combine individual single-level fetches into a `queue`, using `fieldValueExpressions` with `responseData "allRecords"` so that each fetch in the queue uses the output of the previous fetch as its criteria (so the first fetch returns the parents of the matching nodes, the second fetch returns the parents of those nodes, and so on). Again, the number of fetches per queue can be configured with the `matchingLeafJoinDepth` property. This approach works for any server-side DataSource implementation, including your own custom implementations
    - For `client-side` dataSources, which support neither self-joins not queueing, the algorithm simply makes as many single-level requests as necessary to build the entire skeleton. Note, this is exactly what would happen with previously-mentioned queueing approach, if you set `matchingLeafJoinDepth` to 1
    If you want to disable the automatic handling of `keepParentsOnFilter` on load-on-demand trees, see `serverKeepParentsOnFilter`
    Returns:
      Current keepParentsOnFilter value. Default value is null
    See Also:
      - `getKeepParentsOnFilterMaxNodes()`
      - `Tree DataBinding`

  - ### setKeepParentsOnFilterMaxNodes

    public ResultTree setKeepParentsOnFilterMaxNodes(Integer keepParentsOnFilterMaxNodes)
    When a tree specifies the combination of `keepParentsOnFilter` and `loadDataOnDemand`, Smart GWT by default automatically fetches the "skeleton" of the filtered tree - see the `keepParentsOnFilter` overview for details, including the definition of "skeleton" and other relevant terminology

    A problem can arise with this approach if the user enters overly inclusive filter criteria. For example, say you have a 200,000 row dataset and the user chooses to apply a filter of "a". Chances are that is going to include the majority of the nodes in the tree, which would be OK because this is a load-on-demand tree. However, because we will build, cache and then pass around the list of id's of the dangling parents, this may become a performance issue. A lot depends on the nature of your data - this will be much less of an issue for shallow trees with lots of leaf nodes relative to parents, compared to deep trees with a lot of dangling parents to record.

    If the user tries to filter the TreeGrid such that there are more matching nodes than is allowed by this setting, the system will truncate the fetch and show the warning message defined in `keepParentsOnFilterMaxNodesExceededMessage`. Since the cached node-list is derived from bottom to top, this truncation of the fetch process will usually mean we have not yet derived any top-level nodes. This in turn means that the tree will appear to be empty.

    Setting this property to a suitable value for your specific use case is an application tuning exercise, finding the right balance between usability and performance. To remove the node limit altogether, set this property to -1. However, if you have a load-on-demand tree over a large dataset, we do not recommend that you remove the limit completely, as it can lead to serious problems on both the client and server, as the application tries to cope with criteria that contains huge numbers of id's.

    Parameters:
      `keepParentsOnFilterMaxNodes` - New keepParentsOnFilterMaxNodes value. Default value is 8000
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getKeepParentsOnFilterMaxNodes

    public Integer getKeepParentsOnFilterMaxNodes()
    When a tree specifies the combination of `keepParentsOnFilter` and `loadDataOnDemand`, Smart GWT by default automatically fetches the "skeleton" of the filtered tree - see the `keepParentsOnFilter` overview for details, including the definition of "skeleton" and other relevant terminology

    A problem can arise with this approach if the user enters overly inclusive filter criteria. For example, say you have a 200,000 row dataset and the user chooses to apply a filter of "a". Chances are that is going to include the majority of the nodes in the tree, which would be OK because this is a load-on-demand tree. However, because we will build, cache and then pass around the list of id's of the dangling parents, this may become a performance issue. A lot depends on the nature of your data - this will be much less of an issue for shallow trees with lots of leaf nodes relative to parents, compared to deep trees with a lot of dangling parents to record.

    If the user tries to filter the TreeGrid such that there are more matching nodes than is allowed by this setting, the system will truncate the fetch and show the warning message defined in `keepParentsOnFilterMaxNodesExceededMessage`. Since the cached node-list is derived from bottom to top, this truncation of the fetch process will usually mean we have not yet derived any top-level nodes. This in turn means that the tree will appear to be empty.

    Setting this property to a suitable value for your specific use case is an application tuning exercise, finding the right balance between usability and performance. To remove the node limit altogether, set this property to -1. However, if you have a load-on-demand tree over a large dataset, we do not recommend that you remove the limit completely, as it can lead to serious problems on both the client and server, as the application tries to cope with criteria that contains huge numbers of id's.

    Returns:
      Current keepParentsOnFilterMaxNodes value. Default value is 8000

  - ### setLinkDataAddOperation

    public ResultTree setLinkDataAddOperation(String linkDataAddOperation)
    The `operationId` this `ResultTree` should use when performing add operations on its `linkDataSource`. Has no effect if this is not a `multi-link tree`.

    Note, this property wll be used by internal update operations when you drag-move or drag-reparent nodes in a multi-link tree. Do not use it when adding records from application code by directly calling `addData()` on the `linkDataSource`; instead just use the regular `operationId` property in your add request. Also note, because this property is intended to allow your code to influence the operationId used by internal methods, and those methods never directly update link data (moved and re-parented links are always removed and then re-added), there is no corresponding `linkDataUpdateOperation` property.

    Parameters:
      `linkDataAddOperation` - New linkDataAddOperation value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getLinkDataAddOperation

    public String getLinkDataAddOperation()
    The `operationId` this `ResultTree` should use when performing add operations on its `linkDataSource`. Has no effect if this is not a `multi-link tree`.

    Note, this property wll be used by internal update operations when you drag-move or drag-reparent nodes in a multi-link tree. Do not use it when adding records from application code by directly calling `addData()` on the `linkDataSource`; instead just use the regular `operationId` property in your add request. Also note, because this property is intended to allow your code to influence the operationId used by internal methods, and those methods never directly update link data (moved and re-parented links are always removed and then re-added), there is no corresponding `linkDataUpdateOperation` property.

    Returns:
      Current linkDataAddOperation value. Default value is null

  - ### setLinkDataFetchMode

    public ResultTree setLinkDataFetchMode(LinkDataFetchMode linkDataFetchMode) throws IllegalStateException
    The fetch mode for this tree's link data; ignored if this is not a `multi-link tree`
    Parameters:
      `linkDataFetchMode` - New linkDataFetchMode value. Default value is "separate"
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getLinkDataFetchMode

    public LinkDataFetchMode getLinkDataFetchMode()
    The fetch mode for this tree's link data; ignored if this is not a `multi-link tree`
    Returns:
      Current linkDataFetchMode value. Default value is "separate"

  - ### setLinkDataFetchOperation

    public ResultTree setLinkDataFetchOperation(String linkDataFetchOperation)
    The `operationId` this `ResultTree` should use when performing fetch operations on its `linkDataSource`. Has no effect if this is not a `multi-link tree`

    Note, this value can be overridden by `DSRequest.linkDataFetchOperation` when calling `fetchData()` on the component (e.g. `TreeGrid.fetchData`) directly from application code.

    Parameters:
      `linkDataFetchOperation` - New linkDataFetchOperation value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getLinkDataFetchOperation

    public String getLinkDataFetchOperation()
    The `operationId` this `ResultTree` should use when performing fetch operations on its `linkDataSource`. Has no effect if this is not a `multi-link tree`

    Note, this value can be overridden by `DSRequest.linkDataFetchOperation` when calling `fetchData()` on the component (e.g. `TreeGrid.fetchData`) directly from application code.

    Returns:
      Current linkDataFetchOperation value. Default value is null

  - ### setLinkDataRemoveOperation

    public ResultTree setLinkDataRemoveOperation(String linkDataRemoveOperation)
    The `operationId` this `ResultTree` should use when performing remove operations on its `linkDataSource`. Has no effect if this is not a `multi-link tree`.

    See `linkDataAddOperation` for more information on how this property is intended to be used.

    Parameters:
      `linkDataRemoveOperation` - New linkDataRemoveOperation value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getLinkDataRemoveOperation

    public String getLinkDataRemoveOperation()
    The `operationId` this `ResultTree` should use when performing remove operations on its `linkDataSource`. Has no effect if this is not a `multi-link tree`.

    See `linkDataAddOperation` for more information on how this property is intended to be used.

    Returns:
      Current linkDataRemoveOperation value. Default value is null

  - ### setLinkDataSource

    public ResultTree setLinkDataSource(DataSource linkDataSource) throws IllegalStateException
    This property allows you to specify the dataSource to be used for fetching link information in a databound multilink tree. A multilink tree is one where the same node is allowed to appear in multiple places in the tree, and it is achieved by providing the node data and the link data separately. Nodes are provided via the normal `dataSource`; `linkDataSource` is only used for fetching and updating link information.

    The `linkDataSource` is an ordinary `DataSource` that you implement just like any other. However, for correct operation as a `linkDataSource`, it must have the following:

    - A `primaryKey field`. Like any dataSource, a `linkDataSource` is not fully functional without a `primaryKey` field
    - A field named the same as the `Tree.parentIdField`
    - A field named the same as the `Tree.idField`
    - Optionally, a field named the same as the `Tree.linkPositionField`
    - Fields for other values you may wish to store with the link, if any

    ### Providing node data and link data

    Consider a structure for the components of a bicycle, greatly simplified:

                  Frame
                 /    \
              Wheel   Wheel
             /  \     /  \
           Hub Tire  Hub Tire

    Here, the two wheels are the same assembly, so really it should look like this:

                Frame
                 | |
                Wheel
                /   \
              Hub  Tire

    Normal Smart GWT trees cannot model this arrangement accurately because this is not really a tree, it is a graph; trees do not contain multiple paths to a given node. The only way to handle this arrangement of nodes in a formal tree would be to make two copies of the "Wheel" node, at which point they are no longer the same thing. Either way, in a `TreeGrid`, we would have to visualise it like this:

            Frame
               Wheel
                  Hub
                  Tire
               Wheel
                  Hub
                  Tire

    But if we use copies so that the the two wheels are no longer the same thing, changing one of them will no longer change the other, which is a fundamental problem because in this scenario, the two wheels really are the same thing. Now, changing the name of the "Hub" in one "Wheel" would not change it in the other; adding a "Spokes" node to the second item would not also add it to the first. Drag-reordering child nodes in one "Wheel" would not re-order them in the other. All of these things are incorrect, because the two wheels are the same thing.

    Multilink trees provide a way to handle this arrangement without physical copying of the duplicate nodes, preserving the sameness of them and thus fixing all the problems described above.

    The node data for the above tree, simplified, would be a flat list something like this:

            [
               { id: 1, description: "Frame" },
               { id: 2, description: "Wheel" },
               { id: 3, description: "Hub" },
               { id: 4, description: "Tire" }
            ]

    The link data would look like this:

            [
               { linkId: 1, parentId: 1, id: 2, position: 1 },
               { linkId: 2, parentId: 2, id: 3, position: 1 },
               { linkId: 3, parentId: 2, id: 4, position: 2 },
               { linkId: 4, parentId: 1, id: 2, position: 2 }
            ]

    Or, if you were using `linkDataFetchMode` "single", you would combine the node and link data into a single dataset like this:

            [
               { id: 1, position: 0, description: "Frame" },
               { parentId: 1, id: 2, position: 1, description: "Wheel", linkId: 1 },
               { parentId: 2, id: 3, position: 1, description: "Hub", linkId: 2 },
               { parentId: 2, id: 4, position: 2, description: "Tire", linkId: 3 },
               { parentId: 1, id: 2, position: 2, description: "Wheel", linkId: 4 }
            ]

    NOTE: It is also possible to create an unbound multilink tree - see `Tree.linkData`.

    Parameters:
      `linkDataSource` - New linkDataSource value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getLinkDataSource

    public DataSource getLinkDataSource()
    This property allows you to specify the dataSource to be used for fetching link information in a databound multilink tree. A multilink tree is one where the same node is allowed to appear in multiple places in the tree, and it is achieved by providing the node data and the link data separately. Nodes are provided via the normal `dataSource`; `linkDataSource` is only used for fetching and updating link information.

    The `linkDataSource` is an ordinary `DataSource` that you implement just like any other. However, for correct operation as a `linkDataSource`, it must have the following:

    - A `primaryKey field`. Like any dataSource, a `linkDataSource` is not fully functional without a `primaryKey` field
    - A field named the same as the `Tree.parentIdField`
    - A field named the same as the `Tree.idField`
    - Optionally, a field named the same as the `Tree.linkPositionField`
    - Fields for other values you may wish to store with the link, if any

    ### Providing node data and link data

    Consider a structure for the components of a bicycle, greatly simplified:

                  Frame
                 /    \
              Wheel   Wheel
             /  \     /  \
           Hub Tire  Hub Tire

    Here, the two wheels are the same assembly, so really it should look like this:

                Frame
                 | |
                Wheel
                /   \
              Hub  Tire

    Normal Smart GWT trees cannot model this arrangement accurately because this is not really a tree, it is a graph; trees do not contain multiple paths to a given node. The only way to handle this arrangement of nodes in a formal tree would be to make two copies of the "Wheel" node, at which point they are no longer the same thing. Either way, in a `TreeGrid`, we would have to visualise it like this:

            Frame
               Wheel
                  Hub
                  Tire
               Wheel
                  Hub
                  Tire

    But if we use copies so that the the two wheels are no longer the same thing, changing one of them will no longer change the other, which is a fundamental problem because in this scenario, the two wheels really are the same thing. Now, changing the name of the "Hub" in one "Wheel" would not change it in the other; adding a "Spokes" node to the second item would not also add it to the first. Drag-reordering child nodes in one "Wheel" would not re-order them in the other. All of these things are incorrect, because the two wheels are the same thing.

    Multilink trees provide a way to handle this arrangement without physical copying of the duplicate nodes, preserving the sameness of them and thus fixing all the problems described above.

    The node data for the above tree, simplified, would be a flat list something like this:

            [
               { id: 1, description: "Frame" },
               { id: 2, description: "Wheel" },
               { id: 3, description: "Hub" },
               { id: 4, description: "Tire" }
            ]

    The link data would look like this:

            [
               { linkId: 1, parentId: 1, id: 2, position: 1 },
               { linkId: 2, parentId: 2, id: 3, position: 1 },
               { linkId: 3, parentId: 2, id: 4, position: 2 },
               { linkId: 4, parentId: 1, id: 2, position: 2 }
            ]

    Or, if you were using `linkDataFetchMode` "single", you would combine the node and link data into a single dataset like this:

            [
               { id: 1, position: 0, description: "Frame" },
               { parentId: 1, id: 2, position: 1, description: "Wheel", linkId: 1 },
               { parentId: 2, id: 3, position: 1, description: "Hub", linkId: 2 },
               { parentId: 2, id: 4, position: 2, description: "Tire", linkId: 3 },
               { parentId: 1, id: 2, position: 2, description: "Wheel", linkId: 4 }
            ]

    NOTE: It is also possible to create an unbound multilink tree - see `Tree.linkData`.

    Returns:
      Current linkDataSource value. Default value is null

  - ### setLinkDataSource

    public ResultTree setLinkDataSource(String linkDataSource) throws IllegalStateException
    This property allows you to specify the dataSource to be used for fetching link information in a databound multilink tree. A multilink tree is one where the same node is allowed to appear in multiple places in the tree, and it is achieved by providing the node data and the link data separately. Nodes are provided via the normal `dataSource`; `linkDataSource` is only used for fetching and updating link information.

    The `linkDataSource` is an ordinary `DataSource` that you implement just like any other. However, for correct operation as a `linkDataSource`, it must have the following:

    - A `primaryKey field`. Like any dataSource, a `linkDataSource` is not fully functional without a `primaryKey` field
    - A field named the same as the `Tree.parentIdField`
    - A field named the same as the `Tree.idField`
    - Optionally, a field named the same as the `Tree.linkPositionField`
    - Fields for other values you may wish to store with the link, if any

    ### Providing node data and link data

    Consider a structure for the components of a bicycle, greatly simplified:

                  Frame
                 /    \
              Wheel   Wheel
             /  \     /  \
           Hub Tire  Hub Tire

    Here, the two wheels are the same assembly, so really it should look like this:

                Frame
                 | |
                Wheel
                /   \
              Hub  Tire

    Normal Smart GWT trees cannot model this arrangement accurately because this is not really a tree, it is a graph; trees do not contain multiple paths to a given node. The only way to handle this arrangement of nodes in a formal tree would be to make two copies of the "Wheel" node, at which point they are no longer the same thing. Either way, in a `TreeGrid`, we would have to visualise it like this:

            Frame
               Wheel
                  Hub
                  Tire
               Wheel
                  Hub
                  Tire

    But if we use copies so that the the two wheels are no longer the same thing, changing one of them will no longer change the other, which is a fundamental problem because in this scenario, the two wheels really are the same thing. Now, changing the name of the "Hub" in one "Wheel" would not change it in the other; adding a "Spokes" node to the second item would not also add it to the first. Drag-reordering child nodes in one "Wheel" would not re-order them in the other. All of these things are incorrect, because the two wheels are the same thing.

    Multilink trees provide a way to handle this arrangement without physical copying of the duplicate nodes, preserving the sameness of them and thus fixing all the problems described above.

    The node data for the above tree, simplified, would be a flat list something like this:

            [
               { id: 1, description: "Frame" },
               { id: 2, description: "Wheel" },
               { id: 3, description: "Hub" },
               { id: 4, description: "Tire" }
            ]

    The link data would look like this:

            [
               { linkId: 1, parentId: 1, id: 2, position: 1 },
               { linkId: 2, parentId: 2, id: 3, position: 1 },
               { linkId: 3, parentId: 2, id: 4, position: 2 },
               { linkId: 4, parentId: 1, id: 2, position: 2 }
            ]

    Or, if you were using `linkDataFetchMode` "single", you would combine the node and link data into a single dataset like this:

            [
               { id: 1, position: 0, description: "Frame" },
               { parentId: 1, id: 2, position: 1, description: "Wheel", linkId: 1 },
               { parentId: 2, id: 3, position: 1, description: "Hub", linkId: 2 },
               { parentId: 2, id: 4, position: 2, description: "Tire", linkId: 3 },
               { parentId: 1, id: 2, position: 2, description: "Wheel", linkId: 4 }
            ]

    NOTE: It is also possible to create an unbound multilink tree - see `Tree.linkData`.

    Parameters:
      `linkDataSource` - New linkDataSource value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getLinkDataSourceAsString

    public String getLinkDataSourceAsString()
    This property allows you to specify the dataSource to be used for fetching link information in a databound multilink tree. A multilink tree is one where the same node is allowed to appear in multiple places in the tree, and it is achieved by providing the node data and the link data separately. Nodes are provided via the normal `dataSource`; `linkDataSource` is only used for fetching and updating link information.

    The `linkDataSource` is an ordinary `DataSource` that you implement just like any other. However, for correct operation as a `linkDataSource`, it must have the following:

    - A `primaryKey field`. Like any dataSource, a `linkDataSource` is not fully functional without a `primaryKey` field
    - A field named the same as the `Tree.parentIdField`
    - A field named the same as the `Tree.idField`
    - Optionally, a field named the same as the `Tree.linkPositionField`
    - Fields for other values you may wish to store with the link, if any

    ### Providing node data and link data

    Consider a structure for the components of a bicycle, greatly simplified:

                  Frame
                 /    \
              Wheel   Wheel
             /  \     /  \
           Hub Tire  Hub Tire

    Here, the two wheels are the same assembly, so really it should look like this:

                Frame
                 | |
                Wheel
                /   \
              Hub  Tire

    Normal Smart GWT trees cannot model this arrangement accurately because this is not really a tree, it is a graph; trees do not contain multiple paths to a given node. The only way to handle this arrangement of nodes in a formal tree would be to make two copies of the "Wheel" node, at which point they are no longer the same thing. Either way, in a `TreeGrid`, we would have to visualise it like this:

            Frame
               Wheel
                  Hub
                  Tire
               Wheel
                  Hub
                  Tire

    But if we use copies so that the the two wheels are no longer the same thing, changing one of them will no longer change the other, which is a fundamental problem because in this scenario, the two wheels really are the same thing. Now, changing the name of the "Hub" in one "Wheel" would not change it in the other; adding a "Spokes" node to the second item would not also add it to the first. Drag-reordering child nodes in one "Wheel" would not re-order them in the other. All of these things are incorrect, because the two wheels are the same thing.

    Multilink trees provide a way to handle this arrangement without physical copying of the duplicate nodes, preserving the sameness of them and thus fixing all the problems described above.

    The node data for the above tree, simplified, would be a flat list something like this:

            [
               { id: 1, description: "Frame" },
               { id: 2, description: "Wheel" },
               { id: 3, description: "Hub" },
               { id: 4, description: "Tire" }
            ]

    The link data would look like this:

            [
               { linkId: 1, parentId: 1, id: 2, position: 1 },
               { linkId: 2, parentId: 2, id: 3, position: 1 },
               { linkId: 3, parentId: 2, id: 4, position: 2 },
               { linkId: 4, parentId: 1, id: 2, position: 2 }
            ]

    Or, if you were using `linkDataFetchMode` "single", you would combine the node and link data into a single dataset like this:

            [
               { id: 1, position: 0, description: "Frame" },
               { parentId: 1, id: 2, position: 1, description: "Wheel", linkId: 1 },
               { parentId: 2, id: 3, position: 1, description: "Hub", linkId: 2 },
               { parentId: 2, id: 4, position: 2, description: "Tire", linkId: 3 },
               { parentId: 1, id: 2, position: 2, description: "Wheel", linkId: 4 }
            ]

    NOTE: It is also possible to create an unbound multilink tree - see `Tree.linkData`.

    Returns:
      Current linkDataSource value. Default value is null

  - ### setLoadDataOnDemand

    public ResultTree setLoadDataOnDemand(Boolean loadDataOnDemand) throws IllegalStateException
    Does this resultTree load data incrementally as folders within the tree are opened, or is it all loaded in a single request? Must be true if `fetchMode` is "paged"

    See the `keepParentsOnFilter` overview for special considerations when filtering a load-on-demand tree

    Parameters:
      `loadDataOnDemand` - New loadDataOnDemand value. Default value is true
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - `TreeGrid.setLoadDataOnDemand(java.lang.Boolean)`
      - `setUseSimpleCriteriaLOD(boolean)`

  - ### getLoadDataOnDemand

    public Boolean getLoadDataOnDemand()
    Does this resultTree load data incrementally as folders within the tree are opened, or is it all loaded in a single request? Must be true if `fetchMode` is "paged"

    See the `keepParentsOnFilter` overview for special considerations when filtering a load-on-demand tree

    Returns:
      Current loadDataOnDemand value. Default value is true
    See Also:
      - `TreeGrid.getLoadDataOnDemand()`
      - `getUseSimpleCriteriaLOD()`

  - ### setMatchingLeafJoinDepth

    public ResultTree setMatchingLeafJoinDepth(Integer matchingLeafJoinDepth)
    This property allows you to specify the number of ancestor levels Smart GWT attempts to retrieve with each request, when using the built-in support for `keepParentsOnFilter` on `loadDataOnDemand` trees. See the `keepParentsOnFilter` overview for details.
    Parameters:
      `matchingLeafJoinDepth` - New matchingLeafJoinDepth value. Default value is 3
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getMatchingLeafJoinDepth

    public Integer getMatchingLeafJoinDepth()
    This property allows you to specify the number of ancestor levels Smart GWT attempts to retrieve with each request, when using the built-in support for `keepParentsOnFilter` on `loadDataOnDemand` trees. See the `keepParentsOnFilter` overview for details.
    Returns:
      Current matchingLeafJoinDepth value. Default value is 3

  - ### setModelType

    public ResultTree setModelType(TreeModelType modelType)
    Selects the model used to construct the tree representation. See `TreeModelType` for the available options and their implications.

    If the "parent" modelType is used, you can provide the initial parent-linked data set to the tree via the `Tree.data` attribute. If the "children" modelType is used, you can provide the initial tree structure to the Tree via the `Tree.root` attribute.

    Note : This is an advanced setting

    Overrides:
      `setModelType` in class `Tree`
    Parameters:
      `modelType` - New modelType value. Default value is "parent"
    Returns:
      `ResultTree` instance, for chaining setter calls
    See Also:
      - `Tree.setData(com.smartgwt.client.widgets.tree.TreeNode[])`
      - `Tree.setRoot(com.smartgwt.client.widgets.tree.TreeNode)`
      - Node Titles Example

  - ### getModelType

    public TreeModelType getModelType()
    Selects the model used to construct the tree representation. See `TreeModelType` for the available options and their implications.

    If the "parent" modelType is used, you can provide the initial parent-linked data set to the tree via the `Tree.data` attribute. If the "children" modelType is used, you can provide the initial tree structure to the Tree via the `Tree.root` attribute.

    Overrides:
      `getModelType` in class `Tree`
    Returns:
      Current modelType value. Default value is "parent"
    See Also:
      - `Tree.getData()`
      - `Tree.getRoot()`
      - Node Titles Example

  - ### setProgressiveLoading

    public ResultTree setProgressiveLoading(Boolean progressiveLoading)
    Sets `progressive loading mode` for this ResultTree. The ResultTree will copy this setting onto the `DSRequest`s that it issues, overriding the OperationBinding- and DataSource-level settings, in cases where the use of progressive loading does not affect the correctness of the tree's paging algorithm.

    This setting is applied automatically by `DataBoundComponent`s that have their own explicit setting for `progressiveLoading`.

    Note: This property only has an effect for `fetchMode:"paged"` ResultTrees.

    Parameters:
      `progressiveLoading` - New progressiveLoading value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    See Also:
      - `DataSource.setProgressiveLoading(java.lang.Boolean)`
      - `OperationBinding.progressiveLoading`
      - `DSRequest.setProgressiveLoading(java.lang.Boolean)`
      - `Progressive Loading`

  - ### getProgressiveLoading

    public Boolean getProgressiveLoading()
    Sets `progressive loading mode` for this ResultTree. The ResultTree will copy this setting onto the `DSRequest`s that it issues, overriding the OperationBinding- and DataSource-level settings, in cases where the use of progressive loading does not affect the correctness of the tree's paging algorithm.

    This setting is applied automatically by `DataBoundComponent`s that have their own explicit setting for `progressiveLoading`.

    Note: This property only has an effect for `fetchMode:"paged"` ResultTrees.

    Returns:
      Current progressiveLoading value. Default value is null
    See Also:
      - `DataSource.getProgressiveLoading()`
      - `OperationBinding.progressiveLoading`
      - `DSRequest.getProgressiveLoading()`
      - `Progressive Loading`

  - ### setResultSize

    public ResultTree setResultSize(Integer resultSize) throws IllegalStateException
    How many tree nodes to retrieve at once from each large set of children in the tree.

    Applicable only with `fetchMode: "paged"`. When a paged ResultTree is asked for rows that have not yet been loaded, it will fetch adjacent rows that are likely to be required soon, in batches of this size.

    Note : This is an advanced setting

    Parameters:
      `resultSize` - New resultSize value. Default value is 75
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - `Tree DataBinding`

  - ### getResultSize

    public Integer getResultSize()
    How many tree nodes to retrieve at once from each large set of children in the tree.

    Applicable only with `fetchMode: "paged"`. When a paged ResultTree is asked for rows that have not yet been loaded, it will fetch adjacent rows that are likely to be required soon, in batches of this size.

    Returns:
      Current resultSize value. Default value is 75
    See Also:
      - `Tree DataBinding`

  - ### setSendNullParentInLinkDataCriteria

    public ResultTree setSendNullParentInLinkDataCriteria(Boolean sendNullParentInLinkDataCriteria) throws IllegalStateException
    For `multi-link tree`s only, should we send up the `parentId` in fetch criteria if the criteria value is null? If false, we remove the `parentId` from the criteria when `fetching link data`, if the criteria value is null (as it will be by default when fetching the direct child nodes of the tree's root).

    Ignored for non-multiLink trees.

    Parameters:
      `sendNullParentInLinkDataCriteria` - New sendNullParentInLinkDataCriteria value. Default value is true
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getSendNullParentInLinkDataCriteria

    public Boolean getSendNullParentInLinkDataCriteria()
    For `multi-link tree`s only, should we send up the `parentId` in fetch criteria if the criteria value is null? If false, we remove the `parentId` from the criteria when `fetching link data`, if the criteria value is null (as it will be by default when fetching the direct child nodes of the tree's root).

    Ignored for non-multiLink trees.

    Returns:
      Current sendNullParentInLinkDataCriteria value. Default value is true

  - ### setServerFilterFields

    public ResultTree setServerFilterFields(String... serverFilterFields) throws IllegalStateException
    For `fetchMode:"local"` ResultTrees, this property lists field names that will be sent to the server if they are present in the criteria.

    This property may be used to ensure a dataSource receives the necessary criteria to populate a ResultTree's data, and also support `keepParentsOnFilter`.

    Note that for some AdvancedCriteria it will not be possible to extract the subcriteria that apply to certain fields. See `DataSource.splitCriteria()` for details on how serverFilterFields-applicable subcriteria are extracted from the specified criteria for the tree.

    Parameters:
      `serverFilterFields` - New serverFilterFields value. Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getServerFilterFields

    public String[] getServerFilterFields()
    For `fetchMode:"local"` ResultTrees, this property lists field names that will be sent to the server if they are present in the criteria.

    This property may be used to ensure a dataSource receives the necessary criteria to populate a ResultTree's data, and also support `keepParentsOnFilter`.

    Note that for some AdvancedCriteria it will not be possible to extract the subcriteria that apply to certain fields. See `DataSource.splitCriteria()` for details on how serverFilterFields-applicable subcriteria are extracted from the specified criteria for the tree.

    Returns:
      Current serverFilterFields value. Default value is null

  - ### setServerKeepParentsOnFilter

    public ResultTree setServerKeepParentsOnFilter(Boolean serverKeepParentsOnFilter)
    If true, indicates that your own server code will handle the complexities associated with the combination of `keepParentsOnFilter` and `loadDataOnDemand`. If this flag is true and your server code does not handle those complexities, the results are undefined, but most likely you will simply exclude non-matching parents if your tree is load-on-demand, which effectively means that filtering will be broken.

    If this flag is not set, Smart GWT will use its own automatic client-driven algorithm to ensure that `keepParentsOnFilter` is honored on load-on-demand trees. See the `keepParentsOnFilter` overview for details

    Parameters:
      `serverKeepParentsOnFilter` - New serverKeepParentsOnFilter value. Default value is See Below
    Returns:
      `ResultTree` instance, for chaining setter calls

  - ### getServerKeepParentsOnFilter

    public Boolean getServerKeepParentsOnFilter()
    If true, indicates that your own server code will handle the complexities associated with the combination of `keepParentsOnFilter` and `loadDataOnDemand`. If this flag is true and your server code does not handle those complexities, the results are undefined, but most likely you will simply exclude non-matching parents if your tree is load-on-demand, which effectively means that filtering will be broken.

    If this flag is not set, Smart GWT will use its own automatic client-driven algorithm to ensure that `keepParentsOnFilter` is honored on load-on-demand trees. See the `keepParentsOnFilter` overview for details

    Returns:
      Current serverKeepParentsOnFilter value. Default value is See Below

  - ### setUpdateCacheFromRequest

    public ResultTree setUpdateCacheFromRequest(Boolean updateCacheFromRequest) throws IllegalStateException
    When a successful Add, Update or Remove type operation fires on this ResultTree's dataSource, if `DSResponse.data` is unset, should we integrate the submitted data values (from the request) into our data-set?

    Note : This is an advanced setting

    Parameters:
      `updateCacheFromRequest` - New updateCacheFromRequest value. Default value is true
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getUpdateCacheFromRequest

    public Boolean getUpdateCacheFromRequest()
    When a successful Add, Update or Remove type operation fires on this ResultTree's dataSource, if `DSResponse.data` is unset, should we integrate the submitted data values (from the request) into our data-set?
    Returns:
      Current updateCacheFromRequest value. Default value is true

  - ### setUseSimpleCriteriaLOD

    public ResultTree setUseSimpleCriteriaLOD(boolean useSimpleCriteriaLOD)
    Whether or not we should skip promotion of a simple criteria to an `AdvancedCriteria` when sending the `DSRequest` to load the children of a node in a `loadDataOnDemand` or `fetchMode:"paged"` `ResultTree`. If the `DSRequest.textMatchStyle` is not "exact", we normally convert the simple criteria to an `AdvancedCriteria` for correctness in matching the node name, but setting this property to `true` will allow that to be skipped for backcompat with older releases.

    Note : This is an advanced setting

    Parameters:
      `useSimpleCriteriaLOD` - New useSimpleCriteriaLOD value. Default value is false
    Returns:
      `ResultTree` instance, for chaining setter calls
    See Also:
      - `TreeGrid.setAutoFetchTextMatchStyle(com.smartgwt.client.types.TextMatchStyle)`
      - `DataSource.setDefaultTextMatchStyle(com.smartgwt.client.types.TextMatchStyle)`

  - ### getUseSimpleCriteriaLOD

    public boolean getUseSimpleCriteriaLOD()
    Whether or not we should skip promotion of a simple criteria to an `AdvancedCriteria` when sending the `DSRequest` to load the children of a node in a `loadDataOnDemand` or `fetchMode:"paged"` `ResultTree`. If the `DSRequest.textMatchStyle` is not "exact", we normally convert the simple criteria to an `AdvancedCriteria` for correctness in matching the node name, but setting this property to `true` will allow that to be skipped for backcompat with older releases.
    Returns:
      Current useSimpleCriteriaLOD value. Default value is false
    See Also:
      - `TreeGrid.getAutoFetchTextMatchStyle()`
      - `DataSource.getDefaultTextMatchStyle()`

  - ### applyFilter

    public Tree applyFilter(Tree tree, Criteria criteria, TreeFilterMode filterMode, DataSource dataSource)
    The ResultTree will call applyFilter() when it needs to locally filter the tree using the current filter criteria.

    Default behavior is to call `Tree.getFilteredTree()` to obtain a new, filtered tree.

    Override this method or `Tree.getFilteredTree()` to implement your own client-side filtering behavior. Note that the original tree should not be affected.

    Parameters:
      `tree` - the source tree to be filtered
      `criteria` - the filter criteria
      `filterMode` - mode to use for filtering
      `dataSource` - dataSource for filtering if the Tree does not already have one
    Returns:
      the filtered tree (copy)

  - ### applyFilter

    public Tree applyFilter(Tree tree, Criteria criteria, TreeFilterMode filterMode, DataSource dataSource, DSRequest requestProperties)
    The ResultTree will call applyFilter() when it needs to locally filter the tree using the current filter criteria.

    Default behavior is to call `Tree.getFilteredTree()` to obtain a new, filtered tree.

    Override this method or `Tree.getFilteredTree()` to implement your own client-side filtering behavior. Note that the original tree should not be affected.

    Parameters:
      `tree` - the source tree to be filtered
      `criteria` - the filter criteria
      `filterMode` - mode to use for filtering
      `dataSource` - dataSource for filtering if the Tree does not already have one
      `requestProperties` - Request properties block. This allows developers to specify properties that would impact the filter such as `DSRequest.textMatchStyle`
    Returns:
      the filtered tree (copy)

  - ### compareCriteria

    public int compareCriteria(Criteria newCriteria, Criteria oldCriteria)
    Default behavior is to call `DataSource.compareCriteria()` to determine whether new criteria is equivalent to the old criteria (returns 0) or not.

    See `DataSource.compareCriteria()` for a full explanation of the default behavior. The `CriteriaPolicy` used is "dropOnChange".

    Override this method or `DataSource.compareCriteria()` to implement your own client-side filtering behavior.

    Parameters:
      `newCriteria` - new filter criteria
      `oldCriteria` - old filter criteria
    Returns:
      0 if the criteria are equivalent, -1 if the criteria are different
    See Also:
      - `CriteriaPolicy`

  - ### compareCriteria

    public int compareCriteria(Criteria newCriteria, Criteria oldCriteria, DSRequest requestProperties)
    Default behavior is to call `DataSource.compareCriteria()` to determine whether new criteria is equivalent to the old criteria (returns 0) or not.

    See `DataSource.compareCriteria()` for a full explanation of the default behavior. The `CriteriaPolicy` used is "dropOnChange".

    Override this method or `DataSource.compareCriteria()` to implement your own client-side filtering behavior.

    Parameters:
      `newCriteria` - new filter criteria
      `oldCriteria` - old filter criteria
      `requestProperties` - dataSource request properties
    Returns:
      0 if the criteria are equivalent, -1 if the criteria are different
    See Also:
      - `CriteriaPolicy`

  - ### dataArrived

    public void dataArrived(TreeNode parentNode)
    This callback fires whenever the resultTree receives new nodes from the server, after the new nodes have been integrated into the tree.
    Parameters:
      `parentNode` - The parentNode for which children were just loaded

  - ### get

    public TreeNode get(int pos)
    Get the item in the openList at a particular position.
    Overrides:
      `get` in class `RecordList`
    Parameters:
      `pos` - position of the node to get
    Returns:
      node at that position

  - ### getCombinedCriteria

    public Criteria getCombinedCriteria()
    Returns a copy of all `explicit` and `implicit` criteria currently applied to this `ResultTree`.
    Returns:
      combined criteria

  - ### getCombinedCriteriaAsAdvancedCriteria

    public AdvancedCriteria getCombinedCriteriaAsAdvancedCriteria()
    Returns a copy of all `explicit` and `implicit` criteria currently applied to this `ResultTree`.
    Returns:
      combined criteria

  - ### getOpenState

    public String getOpenState()
    Returns a snapshot of the current open state of this tree's data as a `TreeGridOpenState` object.

    This object can be passed to `setOpenState()` or `TreeGrid.setOpenState()` to open the same set of folders within the tree's data (assuming the nodes are still present in the data).

    Returns:
      current open state for the grid. See `TreeGridOpenState`
    See Also:
      - `setOpenState(java.lang.String)`

  - ### getRange

    public TreeNode[] getRange(int start, int end)
    Get a range of items from the open list
    Overrides:
      `getRange` in class `RecordList`
    Parameters:
      `start` - start position
      `end` - end position (NOT inclusive)
    Returns:
      list of nodes in the open list

  - ### invalidateCache

    public void invalidateCache()
    Manually invalidate this ResultTree's cache.

    Generally a ResultTree will detect and incorporate updates to the DataSource that provides its records, but when this is not possible, `invalidateCache()` allows manual cache invalidation.

    Components bound to this ResultTree will typically re-request the currently visible portion of the dataset, causing the ResultTree to re-fetch data from the server.

  - ### setChildren

    public void setChildren(TreeNode parent, List newChildren)
    Replaces the existing children of a parent node. This leaves the node in the loaded state (unless a partially loaded set of children is specified using the optional `totalChildren` argument). The supplied array of children may be null or empty to indicate there are none, but if present must be in the standard format as would be sent from the server, as described by `TreeDataBinding`.

    In particular, note that for a `paged` `ResultTree`, each child node:

    :
    - can have nested children spcified under the `Tree.childrenProperty` (but not via `TreeNode.id`/`TreeNode.parentId` linking)
    - cannot be open unless it includes either a complete set of children, or partial set of children and a childCount
    Overrides:
      `setChildren` in class `Tree`
    Parameters:
      `parent` - parent of children
      `newChildren` - children to be set
    See Also:
      - `Tree.removeChildren(com.smartgwt.client.widgets.tree.TreeNode)`
      - `DataSource.updateCaches(com.smartgwt.client.data.DSResponse)`

  - ### setChildren

    public void setChildren(TreeNode parent, List newChildren, Integer totalChildren)
    Replaces the existing children of a parent node. This leaves the node in the loaded state (unless a partially loaded set of children is specified using the optional `totalChildren` argument). The supplied array of children may be null or empty to indicate there are none, but if present must be in the standard format as would be sent from the server, as described by `TreeDataBinding`.

    In particular, note that for a `paged` `ResultTree`, each child node:

    :
    - can have nested children spcified under the `Tree.childrenProperty` (but not via `TreeNode.id`/`TreeNode.parentId` linking)
    - cannot be open unless it includes either a complete set of children, or partial set of children and a childCount
    Parameters:
      `parent` - parent of children
      `newChildren` - children to be set
      `totalChildren` - number of total children (if not all have been provided as newChildren); only allowed if paging
    See Also:
      - `Tree.removeChildren(com.smartgwt.client.widgets.tree.TreeNode)`
      - `DataSource.updateCaches(com.smartgwt.client.data.DSResponse)`

  - ### setOpenState

    public void setOpenState(String openState)
    Reset the set of open folders within this tree's data to match the `TreeGridOpenState` object passed in.

    Used to restore previous state retrieved from the tree by a call to `getOpenState()`.

    Parameters:
      `openState` - Object describing the desired set of open folders. See `TreeGridOpenState`
    See Also:
      - `getOpenState()`
      - `TreeGridOpenState`

  - ### unloadChildren

    public void unloadChildren(TreeNode node)
    Deprecated.
    It's recommended that you instead use `Tree.reloadChildren()` to reload the children of a folder, or `Tree.removeChildren()` if you need to clear the cached children of a folder to add specific local data.
    Unload the children of a folder, returning the folder to the "unloaded" state.
    Overrides:
      `unloadChildren` in class `Tree`
    Parameters:
      `node` - folder in question

  - ### willFetchData

    public Boolean willFetchData(Criteria newCriteria)
    Will changing the criteria for this resultTree require fetching new data from the server or can the new criteria be satisfied from data already cached on the client?

    This method can be used to determine whether `TreeGrid.fetchData()` or `TreeGrid.filterData()` will cause a server side fetch when passed a certain set of criteria.

    Parameters:
      `newCriteria` - new criteria to test.
    Returns:
      true if server fetch would be required to satisfy new criteria.

  - ### setDefaultProperties

    public static void setDefaultProperties(ResultTree resultTreeProperties)
    Class level method to set the default properties of this class. If set, then all existing and subsequently created instances of this class will automatically have default properties corresponding to the properties set on the SmartGWT class instance passed to this function before its underlying SmartClient JS object was created. This is a powerful feature that eliminates the need for users to create a separate hierarchy of subclasses that only alter the default properties of this class. Can also be used for skinning / styling purposes.

    Note: This method is intended for setting default attributes only and will affect all instances of the underlying class (including those automatically generated in JavaScript). This method should not be used to apply standard EventHandlers or override methods for a class - use a custom subclass instead. Calling this method after instances have been created can result in undefined behavior, since it bypasses any setters and a class instance may have already examined a particular property and not be expecting any changes through this route.

    Parameters:
      `resultTreeProperties` - properties that should be used as new defaults when instances of this class are created
    See Also:
      - `SGWTProperties`

  - ### setDataSource

    public ResultTree setDataSource(DataSource dataSource) throws IllegalStateException
    What `DataSource` is this resultTree associated with?
    Overrides:
      `setDataSource` in class `Tree`
    Parameters:
      `dataSource` - dataSource Default value is null
    Returns:
      `ResultTree` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created
    See Also:
      - `Databinding overview and related methods`
      - DataSource fields Example

  - ### getDataSource

    public DataSource getDataSource()
    What `DataSource` is this resultTree associated with?
    Overrides:
      `getDataSource` in class `Tree`
    Returns:
      DataSource
    See Also:
      - `Databinding overview and related methods`
      - DataSource fields Example

  - ### setRootNode

    public void setRootNode(JavaScriptObject rootNode) throws IllegalStateException
    This attribute may be used to specify a root value for the parentIdField of this resultTree. This overrides the default `rootValue` for this tree, allowing a component to navigate a tree starting at a specific node.

    May be overridden via `treeRootValue` for ResultTrees generated by a TreeGrid component.

    Parameters:
      `rootNode` - rootNode Default value is null
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getRootNode

    public JavaScriptObject getRootNode()
    This attribute may be used to specify a root value for the parentIdField of this resultTree. This overrides the default `rootValue` for this tree, allowing a component to navigate a tree starting at a specific node.

    May be overridden via `treeRootValue` for ResultTrees generated by a TreeGrid component.

    Returns:
      Object