001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements. See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership. The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the  "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    /*
019     * $Id: FuncDoclocation.java 468655 2006-10-28 07:12:06Z minchau $
020     */
021    package org.apache.xpath.functions;
022    
023    import org.apache.xml.dtm.DTM;
024    import org.apache.xpath.XPathContext;
025    import org.apache.xpath.objects.XObject;
026    import org.apache.xpath.objects.XString;
027    
028    /**
029     * Execute the proprietary document-location() function, which returns
030     * a node set of documents.
031     * @xsl.usage advanced
032     */
033    public class FuncDoclocation extends FunctionDef1Arg
034    {
035        static final long serialVersionUID = 7469213946343568769L;
036    
037      /**
038       * Execute the function.  The function must return
039       * a valid object.
040       * @param xctxt The current execution context.
041       * @return A valid XObject.
042       *
043       * @throws javax.xml.transform.TransformerException
044       */
045      public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
046      {
047    
048        int whereNode = getArg0AsNode(xctxt);
049        String fileLocation = null;
050    
051        if (DTM.NULL != whereNode)
052        {
053          DTM dtm = xctxt.getDTM(whereNode);
054          
055          // %REVIEW%
056          if (DTM.DOCUMENT_FRAGMENT_NODE ==  dtm.getNodeType(whereNode))
057          {
058            whereNode = dtm.getFirstChild(whereNode);
059          }
060    
061          if (DTM.NULL != whereNode)
062          {        
063            fileLocation = dtm.getDocumentBaseURI();
064    //        int owner = dtm.getDocument();
065    //        fileLocation = xctxt.getSourceTreeManager().findURIFromDoc(owner);
066          }
067        }
068    
069        return new XString((null != fileLocation) ? fileLocation : "");
070      }
071    }