01: /***
02: * Retrotranslator: a Java bytecode transformer that translates Java classes
03: * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
04: *
05: * Copyright (c) 2005 - 2008 Taras Puchko
06: * All rights reserved.
07: *
08: * Redistribution and use in source and binary forms, with or without
09: * 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: */package net.sf.retrotranslator.transformer;
32:
33: import java.util.*;
34: import net.sf.retrotranslator.runtime.asm.*;
35:
36: /**
37: * @author Taras Puchko
38: */
39: class DuplicateMethodsVisitor extends ClassAdapter {
40:
41: private final SystemLogger logger;
42: private final MethodCounter counter;
43: private final Set<String> visitedMethods = new HashSet<String>();
44:
45: public DuplicateMethodsVisitor(ClassVisitor visitor,
46: SystemLogger logger, MethodCounter counter) {
47: super (visitor);
48: this .logger = logger;
49: this .counter = counter;
50: }
51:
52: public MethodVisitor visitMethod(int access, String name,
53: String desc, String signature, String[] exceptions) {
54: String key = name + desc;
55: if (visitedMethods.contains(key)) {
56: log(access, name);
57: return null;
58: }
59: if (counter.isRepetitive(name, desc) && isBridge(access)) {
60: counter.decrement(name, desc);
61: log(access, name);
62: return null;
63: }
64: visitedMethods.add(key);
65: return super .visitMethod(access, name, desc, signature,
66: exceptions);
67: }
68:
69: private void log(int access, String name) {
70: if (isBridge(access)) {
71: logger.logForFile(Level.VERBOSE, "Bridge method removed: "
72: + name);
73: } else {
74: logger.logForFile(Level.WARNING,
75: "Repetitive method removed: " + name);
76: }
77: }
78:
79: private static boolean isBridge(int access) {
80: return (access & Opcodes.ACC_BRIDGE) != 0;
81: }
82:
83: }
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