DOMTreeWalker.hpp
上传用户:zhuqijet
上传日期:2013-06-25
资源大小:10074k
文件大小:13k
- #ifndef DOMTreeWalker_HEADER_GUARD_
- #define DOMTreeWalker_HEADER_GUARD_
- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2001-2002 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation, and was
- * originally based on software copyright (c) 2001, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- /*
- * $Id: DOMTreeWalker.hpp,v 1.7 2003/03/07 19:59:09 tng Exp $
- */
- #include "DOMNode.hpp"
- #include "DOMNodeFilter.hpp"
- XERCES_CPP_NAMESPACE_BEGIN
- /**
- * <code>DOMTreeWalker</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>DOMTreeWalker</code> will automatically
- * support any view defined by a <code>DOMTreeWalker</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>DOMTreeWalker</code> view may be children of different, widely
- * separated nodes in the original view. For instance, consider a
- * <code>DOMNodeFilter</code> 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.
- * <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
- */
- class CDOM_EXPORT DOMTreeWalker {
- protected:
- // -----------------------------------------------------------------------
- // Hidden constructors
- // -----------------------------------------------------------------------
- /** @name Hidden constructors */
- //@{
- DOMTreeWalker() {};
- //@}
- private:
- // -----------------------------------------------------------------------
- // Unimplemented constructors and operators
- // -----------------------------------------------------------------------
- /** @name Unimplemented constructors and operators */
- //@{
- DOMTreeWalker(const DOMTreeWalker &);
- DOMTreeWalker & operator = (const DOMTreeWalker &);
- //@}
- public:
- // -----------------------------------------------------------------------
- // All constructors are hidden, just the destructor is available
- // -----------------------------------------------------------------------
- /** @name Destructor */
- //@{
- /**
- * Destructor
- *
- */
- virtual ~DOMTreeWalker() {};
- //@}
- // -----------------------------------------------------------------------
- // Virtual DOMTreeWalker interface
- // -----------------------------------------------------------------------
- /** @name Functions introduced in DOM Level 2 */
- //@{
- // -----------------------------------------------------------------------
- // Getter methods
- // -----------------------------------------------------------------------
- /**
- * The <code>root</code> node of the <code>DOMTreeWalker</code>, as specified
- * when it was created.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* getRoot() = 0;
- /**
- * This attribute determines which node types are presented via the
- * <code>DOMTreeWalker</code>. The available set of constants is defined in
- * the <code>DOMNodeFilter</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.
- *
- * @since DOM Level 2
- */
- virtual unsigned long getWhatToShow()= 0;
- /**
- * Return The filter used to screen nodes.
- *
- * @since DOM Level 2
- */
- virtual DOMNodeFilter* getFilter()= 0;
- /**
- * The value of this flag determines whether the children of entity
- * reference nodes are visible to the <code>DOMTreeWalker</code>. If false,
- * these children 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>DOMTreeWalker</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.
- *
- * @since DOM Level 2
- */
- virtual bool getExpandEntityReferences()= 0;
- /**
- * Return the node at which the DOMTreeWalker is currently positioned.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* getCurrentNode()= 0;
- // -----------------------------------------------------------------------
- // Query methods
- // -----------------------------------------------------------------------
- /**
- * 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>DOMTreeWalker</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>DOMTreeWalker</code>'s logical view.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* parentNode()= 0;
- /**
- * Moves the <code>DOMTreeWalker</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>DOMTreeWalker</code>'s logical view.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* firstChild()= 0;
- /**
- * Moves the <code>DOMTreeWalker</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>DOMTreeWalker</code>'s logical view.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* lastChild()= 0;
- /**
- * Moves the <code>DOMTreeWalker</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>DOMTreeWalker</code>'s logical view.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* previousSibling()= 0;
- /**
- * Moves the <code>DOMTreeWalker</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>DOMTreeWalker</code>'s logical view.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* nextSibling()= 0;
- /**
- * Moves the <code>DOMTreeWalker</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>DOMTreeWalker</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>DOMTreeWalker</code>'s logical view.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* previousNode()= 0;
- /**
- * Moves the <code>DOMTreeWalker</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>DOMTreeWalker</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>DOMTreeWalker</code>'s logical view.
- *
- * @since DOM Level 2
- */
- virtual DOMNode* nextNode()= 0;
- // -----------------------------------------------------------------------
- // Setter methods
- // -----------------------------------------------------------------------
- /**
- * The node at which the <code>DOMTreeWalker</code> is currently positioned.
- * <br>Alterations to the DOM tree may cause the current node to no longer
- * be accepted by the <code>DOMTreeWalker</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>.
- *
- * @since DOM Level 2
- */
- virtual void setCurrentNode(DOMNode* currentNode)= 0;
- //@}
- // -----------------------------------------------------------------------
- // Non-standard Extension
- // -----------------------------------------------------------------------
- /** @name Non-standard Extension */
- //@{
- /**
- * Called to indicate that this TreeWalker is no longer in use
- * and that the implementation may relinquish any resources associated with it.
- *
- * Access to a released object will lead to unexpected result.
- */
- virtual void release() = 0;
- //@}
- };
- XERCES_CPP_NAMESPACE_END
- #endif