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


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: FuncLang.java,v 1.8 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.XBoolean;
24 import org.apache.xpath.objects.XObject;
25
26 /**
27  * Execute the Lang() function.
28  * @xsl.usage advanced
29  */
30 public class FuncLang extends FunctionOneArg
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     String JavaDoc lang = m_arg0.execute(xctxt).str();
45     int parent = xctxt.getCurrentNode();
46     boolean isLang = false;
47     DTM dtm = xctxt.getDTM(parent);
48
49     while (DTM.NULL != parent)
50     {
51       if (DTM.ELEMENT_NODE == dtm.getNodeType(parent))
52       {
53         int langAttr = dtm.getAttributeNode(parent, "http://www.w3.org/XML/1998/namespace", "lang");
54
55         if (DTM.NULL != langAttr)
56         {
57           String JavaDoc langVal = dtm.getNodeValue(langAttr);
58           // %OPT%
59 if (langVal.toLowerCase().startsWith(lang.toLowerCase()))
60           {
61             int valLen = lang.length();
62
63             if ((langVal.length() == valLen)
64                     || (langVal.charAt(valLen) == '-'))
65             {
66               isLang = true;
67             }
68           }
69
70           break;
71         }
72       }
73
74       parent = dtm.getParent(parent);
75     }
76
77     return isLang ? XBoolean.S_TRUE : XBoolean.S_FALSE;
78   }
79 }
80
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