01: /*
02: * Copyright 1999-2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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 1.9 2004/08/17 19:25:37 jycli 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: static final long serialVersionUID = -1672834340026116482L;
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)
41: throws javax.xml.transform.TransformerException {
42:
43: String theFirstString = m_arg0.execute(xctxt).str();
44: String theSecondString = m_arg1.execute(xctxt).str();
45: String 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 sbuffer = new StringBuffer();
52:
53: for (int i = 0; i < theFirstStringLength; i++) {
54: char theCurrentChar = theFirstString.charAt(i);
55: int theIndex = theSecondString.indexOf(theCurrentChar);
56:
57: if (theIndex < 0) {
58:
59: // Didn't find the character in the second string, so it
60: // is not translated.
61: sbuffer.append(theCurrentChar);
62: } else if (theIndex < theThirdStringLength) {
63:
64: // OK, there's a corresponding character in the
65: // third string, so do the translation...
66: sbuffer.append(theThirdString.charAt(theIndex));
67: } else {
68:
69: // There's no corresponding character in the
70: // third string, since it's shorter than the
71: // second string. In this case, the character
72: // is removed from the output string, so don't
73: // do anything.
74: }
75: }
76:
77: return new XString(sbuffer.toString());
78: }
79: }
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