org.htmlunit.javascript.host.dom

Class TreeWalker

java.lang.Object

org.htmlunit.corejs.javascript.ScriptableObject

org.htmlunit.javascript.HtmlUnitScriptable

org.htmlunit.javascript.host.dom.TreeWalker

All Implemented Interfaces:

Serializable, Cloneable, org.htmlunit.corejs.javascript.ConstProperties, org.htmlunit.corejs.javascript.debug.DebuggableObject, org.htmlunit.corejs.javascript.Scriptable, org.htmlunit.corejs.javascript.SymbolScriptable

public class TreeWalker
extends HtmlUnitScriptable

The JavaScript object that represents a TreeWalker.

Author:

Mike Dirolf, Frank Danek, Ahmed Ashour, Ronald Brill

See Also:

DOM-Level-2-Traversal-Range, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.htmlunit.corejs.javascript.ScriptableObject

org.htmlunit.corejs.javascript.ScriptableObject.KeyComparator

Field Summary

Fields inherited from class org.htmlunit.corejs.javascript.ScriptableObject

CONST, DONTENUM, EMPTY, PERMANENT, READONLY, UNINITIALIZED_CONST

Fields inherited from interface org.htmlunit.corejs.javascript.Scriptable

NOT_FOUND

Constructor Summary

Constructors

Constructor and Description
TreeWalker() Creates an instance.
TreeWalker(Node root, int whatToShow, org.w3c.dom.traversal.NodeFilter filter, boolean expandEntityReferences) Creates an instance.

Method Summary

Modifier and Type	Method and Description
Node	firstChild() Moves the TreeWalker to the first visible child of the current node, and returns the new node.
Node	getCurrentNode() Gets the node at which the TreeWalker is currently positioned.
Object	getFilter() Gets the filter used to screen nodes.
Node	getRoot() Gets the root node of the TreeWalker, as specified when it was created.
long	getWhatToShow() Gets the whatToShow attribute of the TreeWalker.
void	jsConstructor() Creates an instance.
Node	lastChild() Moves the TreeWalker to the last visible child of the current node, and returns the new node.
Node	nextNode() Moves the TreeWalker to the next visible node in document order relative to the current node, and returns the new node.
Node	nextSibling() Moves the TreeWalker to the next sibling of the current node, and returns the new node.
Node	parentNode() Moves to and returns the closest visible ancestor node of the current node.
Node	previousNode() Moves the TreeWalker to the previous visible node in document order relative to the current node, and returns the new node.
Node	previousSibling() Moves the TreeWalker to the previous sibling of the current node, and returns the new node.
void	setCurrentNode(Node currentNode) Sets the node at which the TreeWalker is currently positioned.

Methods inherited from class org.htmlunit.javascript.HtmlUnitScriptable

clone, equivalentValues, get, getBrowserVersion, getClassName, getDefaultValue, getDomNodeOrDie, getDomNodeOrNull, getPrototype, getScriptableFor, getWindow, getWindow, getWindowFromTopCallScope, getWithPreemption, has, hasInstance, initParentScope, makeScriptableFor, put, setClassName, setDomNode, setDomNode, setParentScope, setupPromise, setupRejectedPromise

Methods inherited from class org.htmlunit.corejs.javascript.ScriptableObject

applyDescriptorToAttributeBitset, associateValue, avoidObjectDetection, buildDataDescriptor, callMethod, callMethod, checkPropertyChange, checkPropertyDefinition, defineClass, defineClass, defineClass, defineConst, defineConstProperty, defineFunctionProperties, defineOwnProperties, defineOwnProperty, defineOwnProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, delete, delete, delete, deleteProperty, deleteProperty, deleteProperty, ensureScriptable, ensureScriptableObject, ensureSymbolScriptable, get, get, get, getAllIds, getArrayPrototype, getAssociatedValue, getAttributes, getAttributes, getAttributes, getAttributes, getAttributes, getClassPrototype, getDefaultValue, getExternalArrayData, getExternalArrayLength, getFunctionPrototype, getGeneratorFunctionPrototype, getGetterOrSetter, getGetterOrSetter, getIds, getObjectPrototype, getOwnPropertyDescriptor, getParentScope, getProperty, getProperty, getProperty, getPropertyIds, getPrototype, getTopLevelScope, getTopScopeValue, getTypedProperty, getTypedProperty, getTypeOf, has, has, hasProperty, hasProperty, hasProperty, isAccessorDescriptor, isConst, isDataDescriptor, isEmpty, isExtensible, isFalse, isGenericDescriptor, isGetterOrSetter, isSealed, isTrue, preventExtensions, put, put, putConst, putConstProperty, putProperty, putProperty, putProperty, querySlot, redefineProperty, sameValue, sealObject, setAttributes, setAttributes, setAttributes, setAttributes, setAttributes, setCommonDescriptorProperties, setExternalArrayData, setGetterOrSetter, setPrototype, size

Methods inherited from class java.lang.Object

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

Constructor Detail

TreeWalker

public TreeWalker()

Creates an instance.

TreeWalker

public TreeWalker(Node root,
                  int whatToShow,
                  org.w3c.dom.traversal.NodeFilter filter,
                  boolean expandEntityReferences)
           throws DOMException

Creates an instance.

Parameters:

root - The root node of the TreeWalker. Must not be null.

whatToShow - Flag specifying which types of nodes appear in the logical view of the TreeWalker. See NodeFilter for the set of possible Show_ values.

filter - The NodeFilter to be used with this TreeWalker, or null to indicate no filter.

expandEntityReferences - If false, the contents of EntityReference nodes are not present in the logical view.

Throws:

DOMException - on attempt to create a TreeWalker with a root that is null.

DOMException

Method Detail

jsConstructor

public void jsConstructor()

Creates an instance.

getRoot

public Node getRoot()

Gets the root node of the TreeWalker, as specified when it was created.

Returns:

the root node of the TreeWalker

getWhatToShow

public long getWhatToShow()

Gets the whatToShow attribute of the TreeWalker. This attribute determines which node types are presented via the TreeWalker. The set of available constants is defined in NodeFilter.

Returns:

the value of the whatToShow attribute of the TreeWalker

getFilter

public Object getFilter()

Gets the filter used to screen nodes.

Returns:

the filter used to screen nodes

getCurrentNode

public Node getCurrentNode()

Gets the node at which the TreeWalker is currently positioned.

Returns:

the currentNode

setCurrentNode

public void setCurrentNode(Node currentNode)
                    throws DOMException

Sets the node at which the TreeWalker is currently positioned.

Parameters:

currentNode - The node to be used as the current position of the TreeWalker.

Throws:

DOMException - on attempt to set currentNode to null.

DOMException

parentNode

public Node parentNode()

Moves to and returns the closest visible ancestor node of the current node. If the search for parentNode attempts to step upward from the TreeWalker's root node, or if it fails to find a visible ancestor node, this method retains the current position and returns null.

Returns:

The new parent node, or null if the current node has no parent in the TreeWalker's logical view.

firstChild

public Node firstChild()

Moves the TreeWalker to the first visible child of the current node, and returns the new node. If the current node has no visible children, returns null, and retains the current node.

Returns:

The new node, or null if the current node has no visible children in the TreeWalker's logical view.

lastChild

public Node lastChild()

Moves the TreeWalker to the last visible child of the current node, and returns the new node. If the current node has no visible children, returns null, and retains the current node.

Returns:

The new node, or null if the current node has no visible children in the TreeWalker's logical view.

previousSibling

public Node previousSibling()

Moves the TreeWalker to the previous sibling of the current node, and returns the new node. If the current node has no visible previous sibling, returns null, and retains the current node.

Returns:

The new node, or null if the current node has no previous sibling in the TreeWalker's logical view.

nextSibling

public Node nextSibling()

Moves the TreeWalker to the next sibling of the current node, and returns the new node. If the current node has no visible next sibling, returns null, and retains the current node.

Returns:

The new node, or null if the current node has no next sibling in the TreeWalker's logical view.

previousNode

public Node previousNode()

Moves the TreeWalker to the previous visible node in document order relative to the current node, and returns the new node. If the current node has no previous node, or if the search for previousNode attempts to step upward from the TreeWalker's root node, returns null, and retains the current node.

Returns:

The new node, or null if the current node has no previous node in the TreeWalker's logical view.

nextNode

public Node nextNode()

Moves the TreeWalker to the next visible node in document order relative to the current node, and returns the new node. If the current node has no next node, or if the search for nextNode attempts to step upward from the TreeWalker's root node, returns null, and retains the current node.

Returns:

The new node, or null if the current node has no next node in the TreeWalker's logical view.