    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *     http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017    package org.apache.commons.jxpath.ri.model.jdom;
    018
    019    import java.util.ArrayList;
    020    import java.util.HashSet;
    021    import java.util.List;
    022    import java.util.Set;
    023
    024    import org.apache.commons.jxpath.ri.model.NodeIterator;
    025    import org.apache.commons.jxpath.ri.model.NodePointer;
    026    import org.jdom.Document;
    027    import org.jdom.Element;
    028    import org.jdom.Namespace;
    029
    030    /**
    031     * An iterator of namespaces of a DOM Node.
    032     *
    033     * @author Dmitri Plotnikov
    034     * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
    035     */
    036    public class JDOMNamespaceIterator implements NodeIterator {
    037        private NodePointer parent;
    038        private List namespaces;
    039        private Set prefixes;
    040        private int position = 0;
    041
    042        /**
    043         * Create a new JDOMNamespaceIterator.
    044         * @param parent the parent NodePointer.
    045         */
    046        public JDOMNamespaceIterator(NodePointer parent) {
    047            this.parent = parent;
    048            Object node = parent.getNode();
    049            if (node instanceof Document) {
    050                node = ((Document) node).getRootElement();
    051            }
    052            if (node instanceof Element) {
    053                namespaces = new ArrayList();
    054                prefixes = new HashSet();
    055                collectNamespaces((Element) node);
    056            }
    057        }
    058
    059        /**
    060         * Collect the namespaces from a JDOM Element.
    061         * @param element the source Element
    062         */
    063        private void collectNamespaces(Element element) {
    064            Namespace ns = element.getNamespace();
    065            if (ns != null && !prefixes.contains(ns.getPrefix())) {
    066                namespaces.add(ns);
    067                prefixes.add(ns.getPrefix());
    068            }
    069            List others = element.getAdditionalNamespaces();
    070            for (int i = 0; i < others.size(); i++) {
    071                ns = (Namespace) others.get(i);
    072                if (ns != null && !prefixes.contains(ns.getPrefix())) {
    073                    namespaces.add(ns);
    074                    prefixes.add(ns.getPrefix());
    075                }
    076            }
    077            Object elementParent = element.getParent();
    078            if (elementParent instanceof Element) {
    079                collectNamespaces((Element) elementParent);
    080            }
    081        }
    082
    083        public NodePointer getNodePointer() {
    084            if (position == 0) {
    085                if (!setPosition(1)) {
    086                    return null;
    087                }
    088                position = 0;
    089            }
    090            int index = position - 1;
    091            if (index < 0) {
    092                index = 0;
    093            }
    094            Namespace ns = (Namespace) namespaces.get(index);
    095            return new JDOMNamespacePointer(parent, ns.getPrefix(), ns.getURI());
    096        }
    097
    098        public int getPosition() {
    099            return position;
    100        }
    101
    102        public boolean setPosition(int position) {
    103            if (namespaces == null) {
    104                return false;
    105            }
    106            this.position = position;
    107            return position >= 1 && position <= namespaces.size();
    108        }
    109    }