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


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: FuncTranslate.java,v 1.8 2004/02/17 04:34:00 minchau Exp $
18  */
19 package org.apache.xpath.functions;
20
21 import org.apache.xpath.XPathContext;
22 import org.apache.xpath.objects.XObject;
23 import org.apache.xpath.objects.XString;
24
25 /**
26  * Execute the Translate() function.
27  * @xsl.usage advanced
28  */
29 public class FuncTranslate extends Function3Args
30 {
31
32   /**
33    * Execute the function. The function must return
34    * a valid object.
35    * @param xctxt The current execution context.
36    * @return A valid XObject.
37    *
38    * @throws javax.xml.transform.TransformerException
39    */
40   public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException JavaDoc
41   {
42
43     String JavaDoc theFirstString = m_arg0.execute(xctxt).str();
44     String JavaDoc theSecondString = m_arg1.execute(xctxt).str();
45     String JavaDoc theThirdString = m_arg2.execute(xctxt).str();
46     int theFirstStringLength = theFirstString.length();
47     int theThirdStringLength = theThirdString.length();
48
49     // A vector to contain the new characters. We'll use it to construct
50 // the result string.
51 StringBuffer JavaDoc sbuffer = new StringBuffer JavaDoc();
52
53     for (int i = 0; i < theFirstStringLength; i++)
54     {
55       char theCurrentChar = theFirstString.charAt(i);
56       int theIndex = theSecondString.indexOf(theCurrentChar);
57
58       if (theIndex < 0)
59       {
60
61         // Didn't find the character in the second string, so it
62 // is not translated.
63 sbuffer.append(theCurrentChar);
64       }
65       else if (theIndex < theThirdStringLength)
66       {
67
68         // OK, there's a corresponding character in the
69 // third string, so do the translation...
70 sbuffer.append(theThirdString.charAt(theIndex));
71       }
72       else
73       {
74
75         // There's no corresponding character in the
76 // third string, since it's shorter than the
77 // second string. In this case, the character
78 // is removed from the output string, so don't
79 // do anything.
80 }
81     }
82
83     return new XString(sbuffer.toString());
84   }
85 }
86
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