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.functions;
  
  import org.apache.xml.dtm.DTM;
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.objects.XObject;
  import org.apache.xpath.objects.XString;
  
  /**
   * Execute the proprietary document-location() function, which returns
   * a node set of documents.
   * @xsl.usage advanced
   */
  public class FuncDoclocation extends FunctionDef1Arg
  {
      static final long serialVersionUID = 7469213946343568769L;
  
    /**
     * 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 whereNode = getArg0AsNode(xctxt);
      String fileLocation = null;
  
      if (DTM.NULL != whereNode)
      {
        DTM dtm = xctxt.getDTM(whereNode);
        
        // %REVIEW%
        if (DTM.DOCUMENT_FRAGMENT_NODE ==  dtm.getNodeType(whereNode))
        {
          whereNode = dtm.getFirstChild(whereNode);
        }
  
        if (DTM.NULL != whereNode)
        {        
          fileLocation = dtm.getDocumentBaseURI();
  //        int owner = dtm.getDocument();
  //        fileLocation = xctxt.getSourceTreeManager().findURIFromDoc(owner);
        }
      }
  
      return new XString((null != fileLocation) ? fileLocation : "");
    }
  }
  