extensions.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    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.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * 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/>.
 */
package org.apache.xalan.lib;

import org.w3c.dom.Node;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.w3c.dom.traversal.NodeIterator;

import org.apache.xpath.NodeSet;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.objects.XBoolean;
import org.apache.xpath.objects.XNumber;
import org.xml.sax.SAXNotSupportedException;

import java.util.Hashtable;
import java.util.StringTokenizer;

import org.apache.xalan.extensions.ExpressionContext;
import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.res.XSLTErrorResources;
// Note: we should consider loading EnvironmentCheck at runtime
//  to simplify inter-package dependencies Sep-01 -sc
import org.apache.xalan.xslt.EnvironmentCheck;
import javax.xml.transform.TransformerException;
import javax.xml.parsers.*;

/**
 * <meta name="usage" content="general"/>
 * This class contains many of the Xalan-supplied extensions.
 * It is accessed by specifying a namespace URI as follows:
 * <pre>
 *    xmlns:xalan="http://xml.apache.org/xalan"
 * </pre>
 */
public class Extensions
{

  // Reuse the Document object to reduce memory usage.
  private static Document lDoc = null;
  
  /**
   * Constructor Extensions
   *
   */
  private Extensions(){}  // Make sure class cannot be instantiated

  /**
   * This method is an extension that implements as a Xalan extension
   * the node-set function also found in xt and saxon.
   * If the argument is a Result Tree Fragment, then <code>nodeset</code>
   * returns a node-set consisting of a single root node as described in
   * section 11.1 of the XSLT 1.0 Recommendation.  If the argument is a
   * node-set, <code>nodeset</code> returns a node-set.  If the argument
   * is a string, number, or boolean, then <code>nodeset</code> returns
   * a node-set consisting of a single root node with a single text node
   * child that is the result of calling the XPath string() function on the
   * passed parameter.  If the argument is anything else, then a node-set
   * is returned consisting of a single root node with a single text node
   * child that is the result of calling the java <code>toString()</code>
   * method on the passed argument.
   * Most of the
   * actual work here is done in <code>MethodResolver</code> and
   * <code>XRTreeFrag</code>.
   * @param myProcessor Context passed by the extension processor
   * @param rtf Argument in the stylesheet to the nodeset extension function
   *
   * NEEDSDOC ($objectName$) @return
   */
  public static NodeSet nodeset(ExpressionContext myProcessor, Object rtf)
  {

    String textNodeValue;

    if (rtf instanceof NodeIterator)
    {
      return new NodeSet((NodeIterator) rtf);
    }
    else
    {
      if (rtf instanceof String)
      {
        textNodeValue = (String) rtf;
      }
      else if (rtf instanceof Boolean)
      {
        textNodeValue = new XBoolean(((Boolean) rtf).booleanValue()).str();
      }
      else if (rtf instanceof Double)
      {
        textNodeValue = new XNumber(((Double) rtf).doubleValue()).str();
      }
      else
      {
        textNodeValue = rtf.toString();
      }

      // This no longer will work right since the DTM.
      // Document myDoc = myProcessor.getContextNode().getOwnerDocument();
      try
      {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document myDoc = db.newDocument();
        
        Text textNode = myDoc.createTextNode(textNodeValue);
        DocumentFragment docFrag = myDoc.createDocumentFragment();
  
        docFrag.appendChild(textNode);
  
        return new NodeSet(docFrag);
      }
      catch(ParserConfigurationException pce)
      {
        throw new org.apache.xml.utils.WrappedRuntimeException(pce);
      }
    }
  }

  /**
   * Returns the intersection of two node-sets.
   * 
   * @param nl1 NodeList for first node-set
   * @param nl2 NodeList for second node-set
   * @return a NodeList containing the nodes in nl1 that are also in nl2
   *
   * Note: The usage of this extension function in the xalan namespace 
   * is deprecated. Please use the same function in the EXSLT sets extension
   * (http://exslt.org/sets).
   */
  public static NodeList intersection(NodeList nl1, NodeList nl2)
  {
    return ExsltSets.intersection(nl1, nl2);
  }

  /**
   * Returns the difference between two node-sets.
   * 
   * @param nl1 NodeList for first node-set
   * @param nl2 NodeList for second node-set
   * @return a NodeList containing the nodes in nl1 that are not in nl2
   * 
   * Note: The usage of this extension function in the xalan namespace 
   * is deprecated. Please use the same function in the EXSLT sets extension
   * (http://exslt.org/sets).
   */
  public static NodeList difference(NodeList nl1, NodeList nl2)
  {
    return ExsltSets.difference(nl1, nl2);
  }

  /**
   * Returns node-set containing distinct string values.
   *
   * @param nl NodeList for node-set
   * @return a NodeList with nodes from nl containing distinct string values.
   * In other words, if more than one node in nl contains the same string value,
   * only include the first such node found.
   *
   * Note: The usage of this extension function in the xalan namespace 
   * is deprecated. Please use the same function in the EXSLT sets extension
   * (http://exslt.org/sets).
   */
  public static NodeList distinct(NodeList nl)
  {