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.Collections;
021    import java.util.List;
022    
023    import org.apache.commons.jxpath.ri.QName;
024    import org.apache.commons.jxpath.ri.model.NodeIterator;
025    import org.apache.commons.jxpath.ri.model.NodePointer;
026    import org.jdom.Attribute;
027    import org.jdom.Element;
028    import org.jdom.Namespace;
029    
030    /**
031     * An iterator of attributes 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 JDOMAttributeIterator implements NodeIterator {
037        private NodePointer parent;
038        private List attributes;
039        private int position = 0;
040    
041        /**
042         * Create a new JDOMAttributeIterator.
043         * @param parent pointer
044         * @param name test
045         */
046        public JDOMAttributeIterator(NodePointer parent, QName name) {
047            this.parent = parent;
048            if (parent.getNode() instanceof Element) {
049                Element element = (Element) parent.getNode();
050                String prefix = name.getPrefix();
051                Namespace ns = null;
052                if (prefix != null) {
053                    if (prefix.equals("xml")) {
054                        ns = Namespace.XML_NAMESPACE;
055                    }
056                    else {
057                        String uri = parent.getNamespaceResolver().getNamespaceURI(prefix);
058                        if (uri != null) {
059                            ns = Namespace.getNamespace(prefix, uri);
060                        }
061                        if (ns == null) {
062                            // TBD: no attributes
063                            attributes = Collections.EMPTY_LIST;
064                            return;
065                        }
066                    }
067                }
068                else {
069                    ns = Namespace.NO_NAMESPACE;
070                }
071    
072                String lname = name.getName();
073                if (!lname.equals("*")) {
074                    attributes = new ArrayList();
075                    Attribute attr = element.getAttribute(lname, ns);
076                    if (attr != null) {
077                        attributes.add(attr);
078                    }
079                }
080                else {
081                    attributes = new ArrayList();
082                    List allAttributes = element.getAttributes();
083                    for (int i = 0; i < allAttributes.size(); i++) {
084                        Attribute attr = (Attribute) allAttributes.get(i);
085                        if (ns == Namespace.NO_NAMESPACE
086                                || attr.getNamespace().equals(ns)) {
087                            attributes.add(attr);
088                        }
089                    }
090                }
091            }
092        }
093    
094        public NodePointer getNodePointer() {
095            if (position == 0) {
096                if (!setPosition(1)) {
097                    return null;
098                }
099                position = 0;
100            }
101            int index = position - 1;
102            if (index < 0) {
103                index = 0;
104            }
105            return new JDOMAttributePointer(
106                parent,
107                (Attribute) attributes.get(index));
108        }
109    
110        public int getPosition() {
111            return position;
112        }
113    
114        public boolean setPosition(int position) {
115            if (attributes == null) {
116                return false;
117            }
118            this.position = position;
119            return position >= 1 && position <= attributes.size();
120        }
121    }