funcdocument.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.templates;

import java.util.Vector;

import java.io.StringWriter;
import java.io.PrintWriter;
import java.io.IOException;

import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.dtm.DTMManager;

import org.apache.xpath.NodeSetDTM;
import org.apache.xpath.functions.Function;
import org.apache.xpath.functions.Function2Args;
import org.apache.xpath.functions.WrongNumberArgsException;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.objects.XNodeSet;
import org.apache.xpath.XPath;
import org.apache.xpath.XPathContext;
import org.apache.xpath.SourceTreeManager;
import org.apache.xpath.Expression;
import org.apache.xpath.XPathContext;
import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.res.XSLTErrorResources;
import org.apache.xpath.XPathContext;
import org.apache.xalan.transformer.TransformerImpl;

import org.xml.sax.InputSource;
import org.xml.sax.Locator;

import javax.xml.transform.TransformerException;
import javax.xml.transform.SourceLocator;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.Source;

import org.apache.xml.utils.SAXSourceLocator;
import org.apache.xml.utils.XMLString;

/**
 * <meta name="usage" content="advanced"/>
 * Execute the Doc() function.
 *
 * When the document function has exactly one argument and the argument
 * is a node-set, then the result is the union, for each node in the
 * argument node-set, of the result of calling the document function with
 * the first argument being the string-value of the node, and the second
 * argument being a node-set with the node as its only member. When the
 * document function has two arguments and the first argument is a node-set,
 * then the result is the union, for each node in the argument node-set,
 * of the result of calling the document function with the first argument
 * being the string-value of the node, and with the second argument being
 * the second argument passed to the document function.
 */
public class FuncDocument extends Function2Args
{

  /**
   * Execute the function.  The function must return
   * a valid object.
   * @param xctxt The current execution context.
   * @return A valid XObject.
   *
   * @throws javax.xml.transform.TransformerException
   */
  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
  {
    int context = xctxt.getCurrentNode();
    DTM dtm = xctxt.getDTM(context);
    
    int docContext = dtm.getDocumentRoot(context);
    XObject arg = (XObject) this.getArg0().execute(xctxt);

    String base = "";
    Expression arg1Expr = this.getArg1();

    if (null != arg1Expr)
    {

      // The URI reference may be relative. The base URI (see [3.2 Base URI]) 
      // of the node in the second argument node-set that is first in document 
      // order is used as the base URI for resolving the 
      // relative URI into an absolute URI. 
      XObject arg2 = arg1Expr.execute(xctxt);

      if (XObject.CLASS_NODESET == arg2.getType())
      {
        int baseNode = arg2.iter().nextNode();

        if (baseNode == DTM.NULL)
          warn(xctxt, XSLTErrorResources.WG_EMPTY_SECOND_ARG, null);
        
        DTM baseDTM = xctxt.getDTM(baseNode);
        base = baseDTM.getDocumentBaseURI();

        // %REVIEW% This doesn't seem to be a problem with the conformance
        // suite, but maybe it's just not doing a good test?
//        int baseDoc = baseDTM.getDocument();
//
//        if (baseDoc == DTM.NULL /* || baseDoc instanceof Stylesheet  -->What to do?? */)
//        {
//
//          // base = ((Stylesheet)baseDoc).getBaseIdentifier();
//          base = xctxt.getNamespaceContext().getBaseIdentifier();
//        }
//        else
//          base = xctxt.getSourceTreeManager().findURIFromDoc(baseDoc);
      }
      else
      {
        base = arg2.str();
      }
    }
    else
    {

      // If the second argument is omitted, then it defaults to 
      // the node in the stylesheet that contains the expression that 
      // includes the call to the document function. Note that a 
      // zero-length URI reference is a reference to the document 
      // relative to which the URI reference is being resolved; thus 
      // document("") refers to the root node of the stylesheet; 
      // the tree representation of the stylesheet is exactly 
      // the same as if the XML document containing the stylesheet 
      // was the initial source document.
      assertion(null != xctxt.getNamespaceContext(), "Namespace context can not be null!");
      base = xctxt.getNamespaceContext().getBaseIdentifier();
    }

    XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
    NodeSetDTM mnl = nodes.mutableNodeset();
    DTMIterator iterator = (XObject.CLASS_NODESET == arg.getType())
                            ? arg.iter() : null;
    int pos = DTM.NULL;

    while ((null == iterator) || (DTM.NULL != (pos = iterator.nextNode())))
    {
      XMLString ref = (null != iterator)
                   ? xctxt.getDTM(pos).getStringValue(pos) : arg.xstr();
      
      // The first and only argument was a nodeset, the base in that
      // case is the base URI of the node from the first argument nodeset. 
      // Remember, when the document function has exactly one argument and
      // the argument is a node-set, then the result is the union, for each
      // node in the argument node-set, of the result of calling the document
      // function with the first argument being the string-value of the node,
      // and the second argument being a node-set with the node as its only 
      // member.
      if (null == arg1Expr && DTM.NULL != pos)
      {
        DTM baseDTM = xctxt.getDTM(pos);
        base = baseDTM.getDocumentBaseURI();
      }

      if (null == ref)
        continue;

      if (DTM.NULL == docContext)
      {
        error(xctxt, XSLTErrorResources.ER_NO_CONTEXT_OWNERDOC, null);  //"context does not have an owner document!");
      }

      // From http://www.ics.uci.edu/pub/ietf/uri/rfc1630.txt
      // A partial form can be distinguished from an absolute form in that the
      // latter must have a colon and that colon must occur before any slash
      // characters. Systems not requiring partial forms should not use any
      // unencoded slashes in their naming schemes.  If they do, absolute URIs
      // will still work, but confusion may result.
      int indexOfColon = ref.indexOf(':');
      int indexOfSlash = ref.indexOf('/');

      if ((indexOfColon != -1) && (indexOfSlash != -1)
              && (indexOfColon < indexOfSlash))
      {

        // The url (or filename, for that matter) is absolute.
        base = null;
      }

      int newDoc = getDoc(xctxt, context, ref.toString(), base);

      // nodes.mutableNodeset().addNode(newDoc);  
      if (DTM.NULL != newDoc)
      {
        // TODO: mnl.addNodeInDocOrder(newDoc, true, xctxt); ??
        if (!mnl.contains(newDoc))
        {
          mnl.addElement(newDoc);
        }
      }

      if (null == iterator || newDoc == DTM.NULL)
        break;
    }

    return nodes;
  }