1/*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5/*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements.  See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License.  You may obtain a copy of the License at
12 *
13 *      http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22package com.sun.org.apache.xpath.internal.functions;
23
24import com.sun.org.apache.xml.internal.dtm.DTM;
25import com.sun.org.apache.xpath.internal.XPathContext;
26import com.sun.org.apache.xpath.internal.objects.XObject;
27import com.sun.org.apache.xpath.internal.objects.XString;
28
29/**
30 * Execute the Namespace() function.
31 * @xsl.usage advanced
32 */
33public class FuncNamespace extends FunctionDef1Arg
34{
35    static final long serialVersionUID = -4695674566722321237L;
36
37  /**
38   * Execute the function.  The function must return
39   * a valid object.
40   * @param xctxt The current execution context.
41   * @return A valid XObject.
42   *
43   * @throws javax.xml.transform.TransformerException
44   */
45  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
46  {
47
48    int context = getArg0AsNode(xctxt);
49
50    String s;
51    if(context != DTM.NULL)
52    {
53      DTM dtm = xctxt.getDTM(context);
54      int t = dtm.getNodeType(context);
55      if(t == DTM.ELEMENT_NODE)
56      {
57        s = dtm.getNamespaceURI(context);
58      }
59      else if(t == DTM.ATTRIBUTE_NODE)
60      {
61
62        // This function always returns an empty string for namespace nodes.
63        // We check for those here.  Fix inspired by Davanum Srinivas.
64
65        s = dtm.getNodeName(context);
66        if(s.startsWith("xmlns:") || s.equals("xmlns"))
67          return XString.EMPTYSTRING;
68
69        s = dtm.getNamespaceURI(context);
70      }
71      else
72        return XString.EMPTYSTRING;
73    }
74    else
75      return XString.EMPTYSTRING;
76
77    return ((null == s) ? XString.EMPTYSTRING : new XString(s));
78  }
79}
80