DOMDocumentTraversal contains methods that create DOMNodeIterators and DOMTreeWalkers to traverse a node and its children in document order (depth first, pre-order traversal, which is equivalent to the order in which the start tags occur in the text representation of the document). More...

#include <xercesc/dom/DOMDocumentTraversal.hpp>

Inheritance diagram for DOMDocumentTraversal:

Public Member Functions
Destructor
virtual	~DOMDocumentTraversal ()
	Destructor.

Functions introduced in DOM Level 2
virtual DOMNodeIterator *	createNodeIterator (DOMNode root, DOMNodeFilter::ShowType whatToShow, DOMNodeFilter filter, bool entityReferenceExpansion)=0
	Creates a NodeIterator object.

virtual DOMTreeWalker *	createTreeWalker (DOMNode root, DOMNodeFilter::ShowType whatToShow, DOMNodeFilter filter, bool entityReferenceExpansion)=0
	Creates a TreeWalker object.

Protected Member Functions
Hidden constructors
	DOMDocumentTraversal ()

Detailed Description

DOMDocumentTraversal contains methods that create DOMNodeIterators and DOMTreeWalkers to traverse a node and its children in document order (depth first, pre-order traversal, which is equivalent to the order in which the start tags occur in the text representation of the document).

In DOMs which support the Traversal feature, DOMDocumentTraversal will be implemented by the same objects that implement the DOMDocument interface.

Since: DOM Level 2

Constructor & Destructor Documentation

◆ DOMDocumentTraversal()

DOMDocumentTraversal::DOMDocumentTraversal ( )

protected

◆ ~DOMDocumentTraversal()

virtual DOMDocumentTraversal::~DOMDocumentTraversal ( )

virtual

Destructor.

Member Function Documentation

◆ createNodeIterator()

virtual DOMNodeIterator * DOMDocumentTraversal::createNodeIterator	(	DOMNode *	root,
		DOMNodeFilter::ShowType	whatToShow,
		DOMNodeFilter *	filter,
		bool	entityReferenceExpansion )

pure virtual

Creates a NodeIterator object.

(DOM2)

NodeIterators are used to step through a set of nodes, e.g. the set of nodes in a NodeList, the document subtree governed by a particular node, the results of a query, or any other set of nodes. The set of nodes to be iterated is determined by the implementation of the NodeIterator. DOM Level 2 specifies a single NodeIterator implementation for document-order traversal of a document subtree. Instances of these iterators are created by calling DOMDocumentTraversal.createNodeIterator().

To produce a view of the document that has entity references expanded and does not expose the entity reference node itself, use the whatToShow flags to hide the entity reference node and set expandEntityReferences to true when creating the iterator. To produce a view of the document that has entity reference nodes but no entity expansion, use the whatToShow flags to show the entity reference node and set expandEntityReferences to false.

Parameters

root	The root node of the DOM tree
whatToShow	This attribute determines which node types are presented via the iterator.
filter	The filter used to screen nodes
entityReferenceExpansion	The value of this flag determines whether the children of entity reference nodes are visible to the iterator. If false, they will be skipped over.

Since: DOM Level 2

◆ createTreeWalker()

virtual DOMTreeWalker * DOMDocumentTraversal::createTreeWalker	(	DOMNode *	root,
		DOMNodeFilter::ShowType	whatToShow,
		DOMNodeFilter *	filter,
		bool	entityReferenceExpansion )

pure virtual

Creates a TreeWalker object.

(DOM2)

TreeWalker objects are used to navigate a document tree or subtree using the view of the document defined by its whatToShow flags and any filters that are defined for the TreeWalker. Any function which performs navigation using a TreeWalker will automatically support any view defined by a TreeWalker.

Omitting nodes from the logical view of a subtree can result in a structure that is substantially different from the same subtree in the complete, unfiltered document. Nodes that are siblings in the TreeWalker view may be children of different, widely separated nodes in the original view. For instance, consider a Filter that skips all nodes except for DOMText nodes and the root node of a document. In the logical view that results, all text nodes will be siblings and appear as direct children of the root node, no matter how deeply nested the structure of the original document.

To produce a view of the document that has entity references expanded and does not expose the entity reference node itself, use the whatToShow flags to hide the entity reference node and set expandEntityReferences to true when creating the TreeWalker. To produce a view of the document that has entity reference nodes but no entity expansion, use the whatToShow flags to show the entity reference node and set expandEntityReferences to false