001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 /*
019 * $Id: XNodeSetForDOM.java 469368 2006-10-31 04:41:36Z minchau $
020 */
021 package org.apache.xpath.objects;
022
023 import org.apache.xml.dtm.DTMManager;
024 import org.apache.xpath.NodeSetDTM;
025 import org.apache.xpath.XPathContext;
026
027 import org.w3c.dom.Node;
028 import org.w3c.dom.NodeList;
029 import org.w3c.dom.traversal.NodeIterator;
030
031 /**
032 * This class overrides the XNodeSet#object() method to provide the original
033 * Node object, NodeList object, or NodeIterator.
034 */
035 public class XNodeSetForDOM extends XNodeSet
036 {
037 static final long serialVersionUID = -8396190713754624640L;
038 Object m_origObj;
039
040 public XNodeSetForDOM(Node node, DTMManager dtmMgr)
041 {
042 m_dtmMgr = dtmMgr;
043 m_origObj = node;
044 int dtmHandle = dtmMgr.getDTMHandleFromNode(node);
045 setObject(new NodeSetDTM(dtmMgr));
046 ((NodeSetDTM) m_obj).addNode(dtmHandle);
047 }
048
049 /**
050 * Construct a XNodeSet object.
051 *
052 * @param val Value of the XNodeSet object
053 */
054 public XNodeSetForDOM(XNodeSet val)
055 {
056 super(val);
057 if(val instanceof XNodeSetForDOM)
058 m_origObj = ((XNodeSetForDOM)val).m_origObj;
059 }
060
061 public XNodeSetForDOM(NodeList nodeList, XPathContext xctxt)
062 {
063 m_dtmMgr = xctxt.getDTMManager();
064 m_origObj = nodeList;
065
066 // JKESS 20020514: Longer-term solution is to force
067 // folks to request length through an accessor, so we can defer this
068 // retrieval... but that requires an API change.
069 // m_obj=new org.apache.xpath.NodeSetDTM(nodeList, xctxt);
070 org.apache.xpath.NodeSetDTM nsdtm=new org.apache.xpath.NodeSetDTM(nodeList, xctxt);
071 m_last=nsdtm.getLength();
072 setObject(nsdtm);
073 }
074
075 public XNodeSetForDOM(NodeIterator nodeIter, XPathContext xctxt)
076 {
077 m_dtmMgr = xctxt.getDTMManager();
078 m_origObj = nodeIter;
079
080 // JKESS 20020514: Longer-term solution is to force
081 // folks to request length through an accessor, so we can defer this
082 // retrieval... but that requires an API change.
083 // m_obj = new org.apache.xpath.NodeSetDTM(nodeIter, xctxt);
084 org.apache.xpath.NodeSetDTM nsdtm=new org.apache.xpath.NodeSetDTM(nodeIter, xctxt);
085 m_last=nsdtm.getLength();
086 setObject(nsdtm);
087 }
088
089 /**
090 * Return the original DOM object that the user passed in. For use primarily
091 * by the extension mechanism.
092 *
093 * @return The object that this class wraps
094 */
095 public Object object()
096 {
097 return m_origObj;
098 }
099
100 /**
101 * Cast result object to a nodelist. Always issues an error.
102 *
103 * @return null
104 *
105 * @throws javax.xml.transform.TransformerException
106 */
107 public NodeIterator nodeset() throws javax.xml.transform.TransformerException
108 {
109 return (m_origObj instanceof NodeIterator)
110 ? (NodeIterator)m_origObj : super.nodeset();
111 }
112
113 /**
114 * Cast result object to a nodelist. Always issues an error.
115 *
116 * @return null
117 *
118 * @throws javax.xml.transform.TransformerException
119 */
120 public NodeList nodelist() throws javax.xml.transform.TransformerException
121 {
122 return (m_origObj instanceof NodeList)
123 ? (NodeList)m_origObj : super.nodelist();
124 }
125
126
127
128 }