org.apache.xpath.objects.XNodeSetForDOM Maven / Gradle / Ivy

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Xalan-Java is an XSLT processor for transforming XML documents into HTML, text, or other XML document types. It implements XSL Transformations (XSLT) Version 1.0 and XML Path Language (XPath) Version 1.0 and can be used from the command line, in an applet or a servlet, or as a module in other program.

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/*
 * 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: XNodeSetForDOM.java 469368 2006-10-31 04:41:36Z minchau $
 */
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();      
  }



}