TreeWalkerImpl.cpp
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- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999-2002 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) 1999, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- /*
- * $Id: TreeWalkerImpl.cpp,v 1.3 2002/11/04 15:04:44 tng Exp $
- */
- #include "TreeWalkerImpl.hpp"
- #include "DOM_Document.hpp"
- #include "DOM_DOMException.hpp"
- #include "DocumentImpl.hpp"
- XERCES_CPP_NAMESPACE_BEGIN
- /** constructor */
- TreeWalkerImpl::TreeWalkerImpl (
- DOM_Node root,
- unsigned long whatToShow,
- DOM_NodeFilter* nodeFilter,
- bool expandEntityRef)
- : fCurrentNode(root),
- fRoot(root),
- fWhatToShow(whatToShow),
- fNodeFilter(nodeFilter),
- fExpandEntityReferences(expandEntityRef)
- {
- }
- TreeWalkerImpl::TreeWalkerImpl (const TreeWalkerImpl& twi)
- : fCurrentNode(twi.fCurrentNode),
- fRoot(twi.fRoot),
- fWhatToShow(twi.fWhatToShow),
- fNodeFilter(twi.fNodeFilter),
- fExpandEntityReferences(twi.fExpandEntityReferences)
- {
- }
- TreeWalkerImpl& TreeWalkerImpl::operator= (const TreeWalkerImpl& twi) {
- if (this != &twi)
- {
- fCurrentNode = twi.fCurrentNode;
- fRoot = twi.fRoot;
- fWhatToShow = twi.fWhatToShow;
- fNodeFilter = twi.fNodeFilter;
- fExpandEntityReferences = twi.fExpandEntityReferences;
- }
- return *this;
- }
- void TreeWalkerImpl::unreferenced()
- {
- DOM_Document doc = fRoot.getOwnerDocument();
- DocumentImpl* impl;
- if (! doc.isNull()) {
- impl = (DocumentImpl *) doc.fImpl;
- }
- else
- impl = (DocumentImpl *) fRoot.fImpl;
- if (impl->treeWalkers != 0L) {
- int i;
- int sz = impl->treeWalkers->size();
- for (i = 0; i < sz; i++)
- if (impl->treeWalkers->elementAt(i) == this) {
- impl->treeWalkers->removeElementAt(i);
- break;
- }
- }
- // delete this;
- TreeWalkerImpl* ptr = this;
- delete ptr;
- }
- /** Return the Root Node. */
- DOM_Node TreeWalkerImpl::getRoot () {
- return fRoot;
- }
- /** Return the whatToShow value */
- unsigned long TreeWalkerImpl::getWhatToShow () {
- return fWhatToShow;
- }
- /** Return the NodeFilter */
- DOM_NodeFilter* TreeWalkerImpl::getFilter () {
- return fNodeFilter;
- }
- /** Get the expandEntity reference flag. */
- bool TreeWalkerImpl::getExpandEntityReferences() {
- return fExpandEntityReferences;
- }
- /** Return the current Node. */
- DOM_Node TreeWalkerImpl::getCurrentNode () {
- return fCurrentNode;
- }
- /** Return the current Node. */
- void TreeWalkerImpl::setCurrentNode (DOM_Node node) {
- fCurrentNode = node;
- }
- /** Return the parent Node from the current node,
- * after applying filter, whatToshow.
- * If result is not null, set the current Node.
- */
- DOM_Node TreeWalkerImpl::parentNode () {
- DOM_Node result;
- if (fCurrentNode.isNull()) return result;
- DOM_Node node = getParentNode(fCurrentNode);
- if (node != 0) {
- fCurrentNode = node;
- }
- return node;
- }
- /** Return the first child Node from the current node,
- * after applying filter, whatToshow.
- * If result is not null, set the current Node.
- */
- DOM_Node TreeWalkerImpl::firstChild () {
- DOM_Node result;
- if (fCurrentNode.isNull()) return result;
- DOM_Node node = getFirstChild(fCurrentNode);
- if (! node.isNull()) {
- fCurrentNode = node;
- }
- return node;
- }
- /** Return the last child Node from the current node,
- * after applying filter, whatToshow.
- * If result is not null, set the current Node.
- */
- DOM_Node TreeWalkerImpl::lastChild () {
- DOM_Node result;
- if (fCurrentNode.isNull()) return result;
- DOM_Node node = getLastChild(fCurrentNode);
- if (! node.isNull()) {
- fCurrentNode = node;
- }
- return node;
- }
- /** Return the previous sibling Node from the current node,
- * after applying filter, whatToshow.
- * If result is not null, set the current Node.
- */
- DOM_Node TreeWalkerImpl::previousSibling () {
-
- DOM_Node result;
- if (fCurrentNode.isNull()) return result;
- DOM_Node node = getPreviousSibling(fCurrentNode);
- if (! node.isNull()) {
- fCurrentNode = node;
- }
- return node;
- }
- /** Return the next sibling Node from the current node,
- * after applying filter, whatToshow.
- * If result is not null, set the current Node.
- */
- DOM_Node TreeWalkerImpl::nextSibling () {
-
- DOM_Node result;
- if (fCurrentNode.isNull()) return result;
- DOM_Node node = getNextSibling(fCurrentNode);
- if (! node.isNull()) {
- fCurrentNode = node;
- }
- return node;
- }
- /** Return the previous Node from the current node,
- * after applying filter, whatToshow.
- * If result is not null, set the current Node.
- */
- DOM_Node TreeWalkerImpl::previousNode () {
-
- DOM_Node result;
- if (fCurrentNode.isNull()) return result;
- // get sibling
- result = getPreviousSibling(fCurrentNode);
- if (result.isNull()) {
- result = getParentNode(fCurrentNode);
- if (! result.isNull()) {
- fCurrentNode = result;
- return fCurrentNode;
- }
- return result;
- }
- // get the lastChild of result.
- DOM_Node lastChild = getLastChild(result);
- // if there is a lastChild which passes filters return it.
- if (! lastChild.isNull()) {
- fCurrentNode = lastChild;
- return fCurrentNode;
- }
- // otherwise return the previous sibling.
- if (! result.isNull()) {
- fCurrentNode = result;
- return fCurrentNode;
- }
- // otherwise return null.
- return result;
- }
- /** Return the next Node from the current node,
- * after applying filter, whatToshow.
- * If result is not null, set the current Node.
- */
- DOM_Node TreeWalkerImpl::nextNode () {
-
- DOM_Node result;
- if (fCurrentNode.isNull()) return result;
- result = getFirstChild(fCurrentNode);
- if (! result.isNull()) {
- fCurrentNode = result;
- return result;
- }
- result = getNextSibling(fCurrentNode);
- if (! result.isNull()) {
- fCurrentNode = result;
- return result;
- }
- // return parent's 1st sibling.
- DOM_Node parent = getParentNode(fCurrentNode);
- while (! parent.isNull()) {
- result = getNextSibling(parent);
- if (! result.isNull()) {
- fCurrentNode = result;
- return result;
- } else {
- parent = getParentNode(parent);
- }
- }
- // end , return null
- return result;
- }
- /** Internal function.
- * Return the parent Node, from the input node
- * after applying filter, whatToshow.
- * The current node is not consulted or set.
- */
- DOM_Node TreeWalkerImpl::getParentNode (DOM_Node node) {
-
- DOM_Node result;
- if (node.isNull() || node == fRoot) return result;
- DOM_Node newNode = node.getParentNode();
- if (newNode.isNull()) return result;
- short accept = acceptNode(newNode);
- if (accept == DOM_NodeFilter::FILTER_ACCEPT)
- return newNode;
- return getParentNode(newNode);
- }
- /** Internal function.
- * Return the nextSibling Node, from the input node
- * after applying filter, whatToshow.
- * The current node is not consulted or set.
- */
- DOM_Node TreeWalkerImpl::getNextSibling (DOM_Node node) {
-
- DOM_Node result;
- if (node.isNull() || node == fRoot) return result;
- DOM_Node newNode = node.getNextSibling();
- if (newNode.isNull()) {
- newNode = node.getParentNode();
- if (newNode.isNull() || node == fRoot) return result;
- short parentAccept = acceptNode(newNode);
- if (parentAccept == DOM_NodeFilter::FILTER_SKIP) {
- return getNextSibling(newNode);
- }
- return result;
- }
- short accept = acceptNode(newNode);
- if (accept == DOM_NodeFilter::FILTER_ACCEPT)
- return newNode;
- else
- if (accept == DOM_NodeFilter::FILTER_SKIP) {
- DOM_Node fChild = getFirstChild(newNode);
- if (fChild.isNull()) {
- return getNextSibling(newNode);
- }
- return fChild;
- }
- return getNextSibling(newNode);
- }
- /** Internal function.
- * Return the previous sibling Node, from the input node
- * after applying filter, whatToshow.
- * The current node is not consulted or set.
- */
- DOM_Node TreeWalkerImpl::getPreviousSibling (DOM_Node node) {
-
- DOM_Node result;
- if (node.isNull() || node == fRoot) return result;
- DOM_Node newNode = node.getPreviousSibling();
- if (newNode.isNull()) {
- newNode = node.getParentNode();
- if (newNode.isNull() || node == fRoot) return result;
- short parentAccept = acceptNode(newNode);
- if (parentAccept == DOM_NodeFilter::FILTER_SKIP) {
- return getPreviousSibling(newNode);
- }
- return result;
- }
- short accept = acceptNode(newNode);
- if (accept == DOM_NodeFilter::FILTER_ACCEPT)
- return newNode;
- else
- if (accept == DOM_NodeFilter::FILTER_SKIP) {
- DOM_Node fChild = getLastChild(newNode);
- if (fChild.isNull()) {
- return getPreviousSibling(newNode);
- }
- return fChild;
- }
- return getPreviousSibling(newNode);
- }
- /** Internal function.
- * Return the first child Node, from the input node
- * after applying filter, whatToshow.
- * The current node is not consulted or set.
- */
- DOM_Node TreeWalkerImpl::getFirstChild (DOM_Node node) {
-
- DOM_Node result;
- if (node.isNull()) return result;
- DOM_Node newNode = node.getFirstChild();
- if (newNode.isNull()) return result;
- short accept = acceptNode(newNode);
- if (accept == DOM_NodeFilter::FILTER_ACCEPT)
- return newNode;
- else
- if (accept == DOM_NodeFilter::FILTER_SKIP
- && newNode.hasChildNodes())
- {
- return getFirstChild(newNode);
- }
- return getNextSibling(newNode);
- }
- /** Internal function.
- * Return the last child Node, from the input node
- * after applying filter, whatToshow.
- * The current node is not consulted or set.
- */
- DOM_Node TreeWalkerImpl::getLastChild (DOM_Node node) {
-
- DOM_Node result;
- if (node.isNull()) return result;
- DOM_Node newNode = node.getLastChild();
- if (newNode.isNull()) return result;
- short accept = acceptNode(newNode);
- if (accept == DOM_NodeFilter::FILTER_ACCEPT)
- return newNode;
- else
- if (accept == DOM_NodeFilter::FILTER_SKIP
- && newNode.hasChildNodes())
- {
- return getLastChild(newNode);
- }
- return getPreviousSibling(newNode);
- }
- /** The node is accepted if it passes the whatToShow and the filter. */
- short TreeWalkerImpl::acceptNode (DOM_Node node) {
-
- if (fNodeFilter == 0) {
- if ( ( fWhatToShow & (1 << (node.getNodeType() - 1))) != 0)
- {
- return DOM_NodeFilter::FILTER_ACCEPT;
- }
- else
- {
- return DOM_NodeFilter::FILTER_SKIP;
- }
- } else {
- // REVISIT: This logic is unclear from the spec!
- if ((fWhatToShow & (1 << (node.getNodeType() - 1))) != 0 ) {
- return fNodeFilter->acceptNode(node);
- } else {
- // what to show has failed!
- if (fNodeFilter->acceptNode(node) == DOM_NodeFilter::FILTER_REJECT) {
- return DOM_NodeFilter::FILTER_REJECT;
- } else {
- return DOM_NodeFilter::FILTER_SKIP;
- }
- }
- }
- }
- XERCES_CPP_NAMESPACE_END