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Java > Open Source Codes > net > sf > retrotranslator > transformer > TextFileTransformer


1 /***
2  * Retrotranslator: a Java bytecode transformer that translates Java classes
3  * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
4  *
5  * Copyright (c) 2005 - 2007 Taras Puchko
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the copyright holders nor the names of its
17  * contributors may be used to endorse or promote products derived from
18  * this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */

32 package net.sf.retrotranslator.transformer;
33
34 import java.io.UnsupportedEncodingException JavaDoc;
35 import java.util.regex.*;
36
37 /**
38  * @author Taras Puchko
39  */

40 class TextFileTransformer {
41
42     private static Pattern pattern = Pattern.compile("([A-Za-z0-9_$]+\\.)+[A-Za-z0-9_$]+");
43
44     private ReplacementLocatorFactory factory;
45
46     public TextFileTransformer(ReplacementLocatorFactory factory) {
47         this.factory = factory;
48     }
49
50     public byte[] transform(byte[] bytes, EmbeddingConverter converter) {
51         boolean modified = false;
52         Matcher matcher = pattern.matcher(toString(bytes));
53         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
54         while (matcher.find()) {
55             String JavaDoc originalName = matcher.group().replace('.', '/');
56             ClassReplacement replacement = factory.getLocator().getReplacement(originalName);
57             String JavaDoc backportName = replacement == null ? originalName : replacement.getReferenceTypeName();
58             String JavaDoc name = converter == null ? backportName : converter.convertClassName(backportName);
59             if (originalName.equals(name)) {
60                 matcher.appendReplacement(buffer, "$0");
61             } else {
62                 modified = true;
63                 matcher.appendReplacement(buffer, Matcher.quoteReplacement(name.replace('/', '.')));
64             }
65         }
66         return modified ? toBytes(matcher.appendTail(buffer).toString()) : bytes;
67     }
68
69     private static String JavaDoc toString(byte[] bytes) {
70         try {
71             return new String JavaDoc(bytes, "UTF-8");
72         } catch (UnsupportedEncodingException JavaDoc e) {
73             throw new RuntimeException JavaDoc(e);
74         }
75     }
76
77     private static byte[] toBytes(String JavaDoc s) {
78         try {
79             return s.getBytes("UTF-8");
80         } catch (UnsupportedEncodingException JavaDoc e) {
81             throw new RuntimeException JavaDoc(e);
82         }
83     }
84
85 }
86
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