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/*
* Copyright (c) 2000 World Wide Web Consortium,
* (Massachusetts Institute of Technology, Institut National de
* Recherche en Informatique et en Automatique, Keio University). All
* Rights Reserved. This program is distributed under the W3C's Software
* Intellectual Property License. This program is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY; without even
* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE.
* See W3C License http://www.w3.org/Consortium/Legal/ for more details.
*/
package org.w3c.dom.traversal;
import org.w3c.dom.Node;
import org.w3c.dom.DOMException;
/**
* <code>DocumentTraversal</code> contains methods that create
* <code>NodeIterators</code> and <code>TreeWalkers</code> 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, <code>DocumentTraversal</code> will be implemented by
* the same objects that implement the Document interface.
* <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Traversal-Range-20001113'>Document Object Model (DOM) Level 2 Traversal and Range Specification</a>.
* @since DOM Level 2
*/
public interface DocumentTraversal {
/**
* Create a new <code>NodeIterator</code> over the subtree rooted at the
* specified node.
* @param root The node which will be iterated together with its
* children. The <code>NodeIterator</code> is initially positioned
* just before this node. The <code>whatToShow</code> flags and the
* filter, if any, are not considered when setting this position. The
* root must not be <code>null</code>.
* @param whatToShow This flag specifies which node types may appear in
* the logical view of the tree presented by the
* <code>NodeIterator</code>. See the description of
* <code>NodeFilter</code> for the set of possible <code>SHOW_</code>
* values.These flags can be combined using <code>OR</code>.
* @param filter The <code>NodeFilter</code> to be used with this
* <code>NodeIterator</code>, or <code>null</code> to indicate no
* filter.
* @param entityReferenceExpansion The value of this flag determines
* whether entity reference nodes are expanded.
* @return The newly created <code>NodeIterator</code>.
* @exception DOMException
* NOT_SUPPORTED_ERR: Raised if the specified <code>root</code> is
* <code>null</code>.
*/
public NodeIterator createNodeIterator(Node root,
int whatToShow,
NodeFilter filter,
boolean entityReferenceExpansion)
throws DOMException;
/**
* Create a new <code>TreeWalker</code> over the subtree rooted at the
* specified node.
* @param root The node which will serve as the <code>root</code> for the
* <code>TreeWalker</code>. The <code>whatToShow</code> flags and the
* <code>NodeFilter</code> are not considered when setting this value;
* any node type will be accepted as the <code>root</code>. The
* <code>currentNode</code> of the <code>TreeWalker</code> is
* initialized to this node, whether or not it is visible. The
* <code>root</code> functions as a stopping point for traversal
* methods that look upward in the document structure, such as
* <code>parentNode</code> and nextNode. The <code>root</code> must
* not be <code>null</code>.
* @param whatToShow This flag specifies which node types may appear in
* the logical view of the tree presented by the
* <code>TreeWalker</code>. See the description of
* <code>NodeFilter</code> for the set of possible <code>SHOW_</code>
* values.These flags can be combined using <code>OR</code>.
* @param filter The <code>NodeFilter</code> to be used with this
* <code>TreeWalker</code>, or <code>null</code> to indicate no filter.
* @param entityReferenceExpansion If this flag is false, the contents of
* <code>EntityReference</code> nodes are not presented in the logical
* view.
* @return The newly created <code>TreeWalker</code>.
* @exception DOMException
* NOT_SUPPORTED_ERR: Raised if the specified <code>root</code> is
* <code>null</code>.
*/
public TreeWalker createTreeWalker(Node root,
int whatToShow,
NodeFilter filter,
boolean entityReferenceExpansion)
throws DOMException;
}
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