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Java > Open Source Codes > org > apache > xpath > functions > FuncNamespace


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /*
17  * $Id: FuncNamespace.java,v 1.10 2004/02/17 04:34:01 minchau Exp $
18  */
19 package org.apache.xpath.functions;
20
21 import org.apache.xml.dtm.DTM;
22 import org.apache.xpath.XPathContext;
23 import org.apache.xpath.objects.XObject;
24 import org.apache.xpath.objects.XString;
25
26 /**
27  * Execute the Namespace() function.
28  * @xsl.usage advanced
29  */
30 public class FuncNamespace extends FunctionDef1Arg
31 {
32
33   /**
34    * Execute the function. The function must return
35    * a valid object.
36    * @param xctxt The current execution context.
37    * @return A valid XObject.
38    *
39    * @throws javax.xml.transform.TransformerException
40    */
41   public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException JavaDoc
42   {
43
44     int context = getArg0AsNode(xctxt);
45     
46     String JavaDoc s;
47     if(context != DTM.NULL)
48     {
49       DTM dtm = xctxt.getDTM(context);
50       int t = dtm.getNodeType(context);
51       if(t == DTM.ELEMENT_NODE)
52       {
53         s = dtm.getNamespaceURI(context);
54       }
55       else if(t == DTM.ATTRIBUTE_NODE)
56       {
57
58         // This function always returns an empty string for namespace nodes.
59 // We check for those here. Fix inspired by Davanum Srinivas.
60
61         s = dtm.getNodeName(context);
62         if(s.startsWith("xmlns:") || s.equals("xmlns"))
63           return XString.EMPTYSTRING;
64
65         s = dtm.getNamespaceURI(context);
66       }
67       else
68         return XString.EMPTYSTRING;
69     }
70     else
71       return XString.EMPTYSTRING;
72     
73     return ((null == s) ? XString.EMPTYSTRING : new XString(s));
74   }
75 }
76
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