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The source code/* * Copyright 1999-2004 The Apache Software Foundation * * Licensed 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.commons.jxpath.ri.model.jdom; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set; import org.apache.commons.jxpath.ri.model.NodeIterator; import org.apache.commons.jxpath.ri.model.NodePointer; import org.jdom.Document; import org.jdom.Element; import org.jdom.Namespace; /** * An iterator of namespaces of a DOM Node. * * @author Dmitri Plotnikov * @version $Revision: 1.9 $ $Date: 2004/04/01 02:55:31 $ */ public class JDOMNamespaceIterator implements NodeIterator { private NodePointer parent; private List namespaces; private Set prefixes; private int position = 0; public JDOMNamespaceIterator(NodePointer parent) { this.parent = parent; Object node = parent.getNode(); if (node instanceof Document) { node = ((Document)node).getRootElement(); } if (node instanceof Element) { namespaces = new ArrayList(); prefixes = new HashSet(); collectNamespaces((Element) node); } } private void collectNamespaces(Element element) { Namespace ns = element.getNamespace(); if (ns != null && !prefixes.contains(ns.getPrefix())) { namespaces.add(ns); prefixes.add(ns.getPrefix()); } List others = element.getAdditionalNamespaces(); for (int i = 0; i < others.size(); i++) { ns = (Namespace) others.get(i); if (ns != null && !prefixes.contains(ns.getPrefix())) { namespaces.add(ns); prefixes.add(ns.getPrefix()); } } Object parent = element.getParent(); if (parent instanceof Element) { collectNamespaces((Element)parent); } } public NodePointer getNodePointer() { if (position == 0) { if (!setPosition(1)) { return null; } position = 0; } int index = position - 1; if (index < 0) { index = 0; } Namespace ns = (Namespace) namespaces.get(index); return new JDOMNamespacePointer(parent, ns.getPrefix(), ns.getURI()); } public int getPosition() { return position; } public boolean setPosition(int position) { if (namespaces == null) { return false; } this.position = position; return position >= 1 && position <= namespaces.size(); } } |
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