code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you 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.
   */
  /*
   * $Id$
   */
  package org.apache.xpath.objects;
  
  import org.apache.xml.dtm.DTMManager;
  import org.apache.xpath.NodeSetDTM;
  import org.apache.xpath.XPathContext;
  
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  import org.w3c.dom.traversal.NodeIterator;
  
  /**
   * This class overrides the XNodeSet#object() method to provide the original 
   * Node object, NodeList object, or NodeIterator.
   */
  public class XNodeSetForDOM extends XNodeSet
  {
      static final long serialVersionUID = -8396190713754624640L;
    Object m_origObj;
  
    public XNodeSetForDOM(Node node, DTMManager dtmMgr)
    {
      m_dtmMgr = dtmMgr;
      m_origObj = node;
      int dtmHandle = dtmMgr.getDTMHandleFromNode(node);
      setObject(new NodeSetDTM(dtmMgr));
      ((NodeSetDTM) m_obj).addNode(dtmHandle);
    }
    
    /**
     * Construct a XNodeSet object.
     *
     * @param val Value of the XNodeSet object
     */
    public XNodeSetForDOM(XNodeSet val)
    {
    	super(val);
    	if(val instanceof XNodeSetForDOM)
      	m_origObj = ((XNodeSetForDOM)val).m_origObj;
    }
    
    public XNodeSetForDOM(NodeList nodeList, XPathContext xctxt)
    {
      m_dtmMgr = xctxt.getDTMManager();
      m_origObj = nodeList;
  
      // JKESS 20020514: Longer-term solution is to force
      // folks to request length through an accessor, so we can defer this
      // retrieval... but that requires an API change.
      // m_obj=new org.apache.xpath.NodeSetDTM(nodeList, xctxt);
      org.apache.xpath.NodeSetDTM nsdtm=new org.apache.xpath.NodeSetDTM(nodeList, xctxt);
      m_last=nsdtm.getLength();
      setObject(nsdtm);   
    }
  
    public XNodeSetForDOM(NodeIterator nodeIter, XPathContext xctxt)
    {
      m_dtmMgr = xctxt.getDTMManager();
      m_origObj = nodeIter;
  
      // JKESS 20020514: Longer-term solution is to force
      // folks to request length through an accessor, so we can defer this
      // retrieval... but that requires an API change.
      // m_obj = new org.apache.xpath.NodeSetDTM(nodeIter, xctxt);
      org.apache.xpath.NodeSetDTM nsdtm=new org.apache.xpath.NodeSetDTM(nodeIter, xctxt);
      m_last=nsdtm.getLength();
      setObject(nsdtm);   
    }
    
    /**
     * Return the original DOM object that the user passed in.  For use primarily
     * by the extension mechanism.
     *
     * @return The object that this class wraps
     */
    public Object object()
    {
      return m_origObj;
    }
    
    /**
     * Cast result object to a nodelist. Always issues an error.
     *
     * @return null
     *
     * @throws javax.xml.transform.TransformerException
     */
    public NodeIterator nodeset() throws javax.xml.transform.TransformerException
    {
      return (m_origObj instanceof NodeIterator) 
                     ? (NodeIterator)m_origObj : super.nodeset();      
    }
    
    /**
     * Cast result object to a nodelist. Always issues an error.
     *
     * @return null
     *
     * @throws javax.xml.transform.TransformerException
     */
    public NodeList nodelist() throws javax.xml.transform.TransformerException
    {
      return (m_origObj instanceof NodeList) 
                     ? (NodeList)m_origObj : super.nodelist();      
    }
  
  
  
  }
  