src/org/apache/xpath/objects/XNodeSetForDOM.java

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999-2003 The Apache Software Foundation.  All rights 
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
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 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 5. Products derived from this software may not be called "Apache",
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, Lotus
 * Development Corporation., http://www.lotus.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
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package org.apache.xpath.objects;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.traversal.NodeIterator;

import org.apache.xml.dtm.*;
import org.apache.xpath.NodeSetDTM;
import org.apache.xpath.XPathContext;

/**
 * This class overrides the XNodeSet#object() method to provide the original 
 * Node object, NodeList object, or NodeIterator.
 */
public class XNodeSetForDOM extends XNodeSet
{
  Object m_origObj;

  public XNodeSetForDOM(Node node, DTMManager dtmMgr)
  {
    m_dtmMgr = dtmMgr;
    m_origObj = node;
    int dtmHandle = dtmMgr.getDTMHandleFromNode(node);
    m_obj = 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();
    m_obj = 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();
    m_obj = 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();      
  }



}