| /* |
| |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| |
| */ |
| |
| package org.apache.batik.dom.traversal; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.apache.batik.dom.AbstractDocument; |
| import org.w3c.dom.DOMException; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.traversal.NodeFilter; |
| import org.w3c.dom.traversal.NodeIterator; |
| import org.w3c.dom.traversal.TreeWalker; |
| |
| /** |
| * This class provides support for traversal. |
| * |
| * @author <a href="mailto:stephane@hillion.org">Stephane Hillion</a> |
| * @version $Id$ |
| */ |
| public class TraversalSupport { |
| |
| /** |
| * The iterators list. |
| */ |
| protected List iterators; |
| |
| /** |
| * Creates a new TraversalSupport. |
| */ |
| public TraversalSupport() { |
| } |
| |
| /** |
| * Creates a new tree walker. |
| */ |
| public static TreeWalker createTreeWalker(AbstractDocument doc, |
| Node root, |
| int whatToShow, |
| NodeFilter filter, |
| boolean entityReferenceExpansion) { |
| if (root == null) { |
| throw doc.createDOMException |
| (DOMException.NOT_SUPPORTED_ERR, "null.root", null); |
| } |
| return new DOMTreeWalker(root, whatToShow, filter, |
| entityReferenceExpansion); |
| } |
| |
| /** |
| * Creates a new node iterator. |
| */ |
| public NodeIterator createNodeIterator(AbstractDocument doc, |
| Node root, |
| int whatToShow, |
| NodeFilter filter, |
| boolean entityReferenceExpansion) |
| throws DOMException { |
| if (root == null) { |
| throw doc.createDOMException |
| (DOMException.NOT_SUPPORTED_ERR, "null.root", null); |
| } |
| NodeIterator result = new DOMNodeIterator(doc, root, whatToShow, |
| filter, |
| entityReferenceExpansion); |
| if (iterators == null) { |
| iterators = new LinkedList(); |
| } |
| iterators.add(result); |
| |
| return result; |
| } |
| |
| /** |
| * Called by the DOM when a node will be removed from the current document. |
| */ |
| public void nodeToBeRemoved(Node removedNode) { |
| if (iterators != null) { |
| for (Object iterator : iterators) { |
| ((DOMNodeIterator) iterator).nodeToBeRemoved(removedNode); |
| } |
| } |
| } |
| |
| /** |
| * Detaches the given node iterator. |
| */ |
| public void detachNodeIterator(NodeIterator it) { |
| iterators.remove(it); |
| } |
| } |