mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-26 06:39:00 +08:00
168 lines
8.0 KiB
Java
168 lines
8.0 KiB
Java
/*
|
|
* 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>TreeWalker</code> objects are used to navigate a document tree or
|
|
* subtree using the view of the document defined by their
|
|
* <code>whatToShow</code> flags and filter (if any). Any function which
|
|
* performs navigation using a <code>TreeWalker</code> will automatically
|
|
* support any view defined by a <code>TreeWalker</code>.
|
|
* <p>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
|
|
* <code>TreeWalker</code> view may be children of different, widely
|
|
* separated nodes in the original view. For instance, consider a
|
|
* <code>NodeFilter</code> that skips all nodes except for Text 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.
|
|
* <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 TreeWalker {
|
|
/**
|
|
* The <code>root</code> node of the <code>TreeWalker</code>, as specified
|
|
* when it was created.
|
|
*/
|
|
public Node getRoot();
|
|
|
|
/**
|
|
* This attribute determines which node types are presented via the
|
|
* <code>TreeWalker</code>. The available set of constants is defined in
|
|
* the <code>NodeFilter</code> interface. Nodes not accepted by
|
|
* <code>whatToShow</code> will be skipped, but their children may still
|
|
* be considered. Note that this skip takes precedence over the filter,
|
|
* if any.
|
|
*/
|
|
public int getWhatToShow();
|
|
|
|
/**
|
|
* The filter used to screen nodes.
|
|
*/
|
|
public NodeFilter getFilter();
|
|
|
|
/**
|
|
* The value of this flag determines whether the children of entity
|
|
* reference nodes are visible to the <code>TreeWalker</code>. If false,
|
|
* they and their descendants will be rejected. Note that this
|
|
* rejection takes precedence over <code>whatToShow</code> and the
|
|
* filter, if any.
|
|
* <br> To produce a view of the document that has entity references
|
|
* expanded and does not expose the entity reference node itself, use
|
|
* the <code>whatToShow</code> flags to hide the entity reference node
|
|
* and set <code>expandEntityReferences</code> to true when creating the
|
|
* <code>TreeWalker</code>. To produce a view of the document that has
|
|
* entity reference nodes but no entity expansion, use the
|
|
* <code>whatToShow</code> flags to show the entity reference node and
|
|
* set <code>expandEntityReferences</code> to false.
|
|
*/
|
|
public boolean getExpandEntityReferences();
|
|
|
|
/**
|
|
* The node at which the <code>TreeWalker</code> is currently positioned.
|
|
* <br>Alterations to the DOM tree may cause the current node to no longer
|
|
* be accepted by the <code>TreeWalker</code>'s associated filter.
|
|
* <code>currentNode</code> may also be explicitly set to any node,
|
|
* whether or not it is within the subtree specified by the
|
|
* <code>root</code> node or would be accepted by the filter and
|
|
* <code>whatToShow</code> flags. Further traversal occurs relative to
|
|
* <code>currentNode</code> even if it is not part of the current view,
|
|
* by applying the filters in the requested direction; if no traversal
|
|
* is possible, <code>currentNode</code> is not changed.
|
|
* @exception DOMException
|
|
* NOT_SUPPORTED_ERR: Raised if an attempt is made to set
|
|
* <code>currentNode</code> to <code>null</code>.
|
|
*/
|
|
public Node getCurrentNode();
|
|
public void setCurrentNode(Node currentNode)
|
|
throws DOMException;
|
|
|
|
/**
|
|
* Moves to and returns the closest visible ancestor node of the current
|
|
* node. If the search for <code>parentNode</code> attempts to step
|
|
* upward from the <code>TreeWalker</code>'s <code>root</code> node, or
|
|
* if it fails to find a visible ancestor node, this method retains the
|
|
* current position and returns <code>null</code>.
|
|
* @return The new parent node, or <code>null</code> if the current node
|
|
* has no parent in the <code>TreeWalker</code>'s logical view.
|
|
*/
|
|
public Node parentNode();
|
|
|
|
/**
|
|
* Moves the <code>TreeWalker</code> to the first visible child of the
|
|
* current node, and returns the new node. If the current node has no
|
|
* visible children, returns <code>null</code>, and retains the current
|
|
* node.
|
|
* @return The new node, or <code>null</code> if the current node has no
|
|
* visible children in the <code>TreeWalker</code>'s logical view.
|
|
*/
|
|
public Node firstChild();
|
|
|
|
/**
|
|
* Moves the <code>TreeWalker</code> to the last visible child of the
|
|
* current node, and returns the new node. If the current node has no
|
|
* visible children, returns <code>null</code>, and retains the current
|
|
* node.
|
|
* @return The new node, or <code>null</code> if the current node has no
|
|
* children in the <code>TreeWalker</code>'s logical view.
|
|
*/
|
|
public Node lastChild();
|
|
|
|
/**
|
|
* Moves the <code>TreeWalker</code> to the previous sibling of the
|
|
* current node, and returns the new node. If the current node has no
|
|
* visible previous sibling, returns <code>null</code>, and retains the
|
|
* current node.
|
|
* @return The new node, or <code>null</code> if the current node has no
|
|
* previous sibling. in the <code>TreeWalker</code>'s logical view.
|
|
*/
|
|
public Node previousSibling();
|
|
|
|
/**
|
|
* Moves the <code>TreeWalker</code> to the next sibling of the current
|
|
* node, and returns the new node. If the current node has no visible
|
|
* next sibling, returns <code>null</code>, and retains the current node.
|
|
* @return The new node, or <code>null</code> if the current node has no
|
|
* next sibling. in the <code>TreeWalker</code>'s logical view.
|
|
*/
|
|
public Node nextSibling();
|
|
|
|
/**
|
|
* Moves the <code>TreeWalker</code> 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
|
|
* <code>previousNode</code> attempts to step upward from the
|
|
* <code>TreeWalker</code>'s <code>root</code> node, returns
|
|
* <code>null</code>, and retains the current node.
|
|
* @return The new node, or <code>null</code> if the current node has no
|
|
* previous node in the <code>TreeWalker</code>'s logical view.
|
|
*/
|
|
public Node previousNode();
|
|
|
|
/**
|
|
* Moves the <code>TreeWalker</code> 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 <code>TreeWalker</code>'s <code>root</code>
|
|
* node, returns <code>null</code>, and retains the current node.
|
|
* @return The new node, or <code>null</code> if the current node has no
|
|
* next node in the <code>TreeWalker</code>'s logical view.
|
|
*/
|
|
public Node nextNode();
|
|
|
|
}
|