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


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.util.*;
35 import net.sf.retrotranslator.runtime.asm.*;
36
37 /**
38  * @author Taras Puchko
39  */
40 class DuplicateMethodsVisitor extends ClassAdapter {
41
42     private final SystemLogger logger;
43     private final MethodCounter counter;
44     private final Set<String JavaDoc> visitedMethods = new HashSet<String JavaDoc>();
45
46     public DuplicateMethodsVisitor(ClassVisitor visitor, SystemLogger logger, MethodCounter counter) {
47         super(visitor);
48         this.logger = logger;
49         this.counter = counter;
50     }
51
52     public MethodVisitor visitMethod(int access, String JavaDoc name, String JavaDoc desc, String JavaDoc signature, String JavaDoc[] exceptions) {
53         String JavaDoc key = name + desc;
54         if (visitedMethods.contains(key)) {
55             log(access, name);
56             return null;
57         }
58         if (counter.isRepetitive(name, desc) && isBridge(access)) {
59             counter.decrement(name, desc);
60             log(access, name);
61             return null;
62         }
63         visitedMethods.add(key);
64         return super.visitMethod(access, name, desc, signature, exceptions);
65     }
66
67     private void log(int access, String JavaDoc name) {
68         if (logger != null) {
69             if (isBridge(access)) {
70                 logger.logForFile(Level.VERBOSE, "Bridge method removed: " + name);
71             } else {
72                 logger.logForFile(Level.WARNING, "Repetitive method removed: " + name);
73             }
74         }
75     }
76
77     private static boolean isBridge(int access) {
78         return (access & Opcodes.ACC_BRIDGE) != 0;
79     }
80
81 }
82
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