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.xpath.internal.XPathContext;
25import com.sun.org.apache.xpath.internal.objects.XObject;
26import com.sun.org.apache.xpath.internal.objects.XString;
27
28/**
29 * Execute the Translate() function.
30 * @xsl.usage advanced
31 */
32public class FuncTranslate extends Function3Args
33{
34    static final long serialVersionUID = -1672834340026116482L;
35
36  /**
37   * Execute the function.  The function must return
38   * a valid object.
39   * @param xctxt The current execution context.
40   * @return A valid XObject.
41   *
42   * @throws javax.xml.transform.TransformerException
43   */
44  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
45  {
46
47    String theFirstString = m_arg0.execute(xctxt).str();
48    String theSecondString = m_arg1.execute(xctxt).str();
49    String theThirdString = m_arg2.execute(xctxt).str();
50    int theFirstStringLength = theFirstString.length();
51    int theThirdStringLength = theThirdString.length();
52
53    // A vector to contain the new characters.  We'll use it to construct
54    // the result string.
55    StringBuffer sbuffer = new StringBuffer();
56
57    for (int i = 0; i < theFirstStringLength; i++)
58    {
59      char theCurrentChar = theFirstString.charAt(i);
60      int theIndex = theSecondString.indexOf(theCurrentChar);
61
62      if (theIndex < 0)
63      {
64
65        // Didn't find the character in the second string, so it
66        // is not translated.
67        sbuffer.append(theCurrentChar);
68      }
69      else if (theIndex < theThirdStringLength)
70      {
71
72        // OK, there's a corresponding character in the
73        // third string, so do the translation...
74        sbuffer.append(theThirdString.charAt(theIndex));
75      }
76      else
77      {
78
79        // There's no corresponding character in the
80        // third string, since it's shorter than the
81        // second string.  In this case, the character
82        // is removed from the output string, so don't
83        // do anything.
84      }
85    }
86
87    return new XString(sbuffer.toString());
88  }
89}
90