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 */
017package org.apache.commons.jxpath.ri.model.jdom;
018
019import java.util.ArrayList;
020import java.util.Collections;
021import java.util.List;
022
023import org.apache.commons.jxpath.ri.QName;
024import org.apache.commons.jxpath.ri.model.NodeIterator;
025import org.apache.commons.jxpath.ri.model.NodePointer;
026import org.jdom.Attribute;
027import org.jdom.Element;
028import 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 13:46:46 -0400 (Fri, 02 May 2008) $
035 */
036public 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}