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Java > Open Source Codes > org > objectweb > asm > optimizer > ClassOptimizer


1 /***
2  * ASM: a very small and fast Java bytecode manipulation framework
3  * Copyright (c) 2000-2005 INRIA, France Telecom
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of the copyright holders nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28  * THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 package org.objectweb.asm.optimizer;
31
32 import org.objectweb.asm.AnnotationVisitor;
33 import org.objectweb.asm.Attribute;
34 import org.objectweb.asm.ClassAdapter;
35 import org.objectweb.asm.ClassVisitor;
36 import org.objectweb.asm.FieldVisitor;
37 import org.objectweb.asm.MethodVisitor;
38 import org.objectweb.asm.Opcodes;
39
40 /**
41  * A {@link ClassAdapter} that renames fields and methods, and removes debug
42  * info.
43  *
44  * @author Eric Bruneton
45  */
46 public class ClassOptimizer extends ClassAdapter {
47
48     private NameMapping mapping;
49
50     private String JavaDoc className;
51
52     public ClassOptimizer(final ClassVisitor cv, final NameMapping mapping) {
53         super(cv);
54         this.mapping = mapping;
55     }
56
57     public String JavaDoc getClassName() {
58         return className;
59     }
60
61     // ------------------------------------------------------------------------
62 // Overriden methods
63 // ------------------------------------------------------------------------
64
65     public void visit(
66         final int version,
67         final int access,
68         final String JavaDoc name,
69         final String JavaDoc signature,
70         final String JavaDoc superName,
71         final String JavaDoc[] interfaces)
72     {
73         className = name;
74         cv.visit(version,
75                 access,
76                 mapping.map(name),
77                 null,
78                 mapping.map(superName),
79                 interfaces);
80     }
81
82     public void visitSource(final String JavaDoc source, final String JavaDoc debug) {
83         // remove debug info
84 }
85
86     public void visitOuterClass(
87         final String JavaDoc owner,
88         final String JavaDoc name,
89         final String JavaDoc desc)
90     {
91         // remove debug info
92 }
93
94     public AnnotationVisitor visitAnnotation(
95         final String JavaDoc desc,
96         final boolean visible)
97     {
98         throw new UnsupportedOperationException JavaDoc();
99     }
100
101     public void visitAttribute(final Attribute attr) {
102         // remove non standard attribute
103 }
104
105     public void visitInnerClass(
106         final String JavaDoc name,
107         final String JavaDoc outerName,
108         final String JavaDoc innerName,
109         final int access)
110     {
111         // remove debug info
112 }
113
114     public FieldVisitor visitField(
115         final int access,
116         final String JavaDoc name,
117         final String JavaDoc desc,
118         final String JavaDoc signature,
119         final Object JavaDoc value)
120     {
121         if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
122             if ((access & Opcodes.ACC_FINAL) != 0
123                     && (access & Opcodes.ACC_STATIC) != 0 && desc.equals("I"))
124             {
125                 return null;
126             }
127             cv.visitField(access,
128                     mapping.map(className + "." + name),
129                     mapping.fix(desc),
130                     null,
131                     value);
132         } else {
133             cv.visitField(access, name, desc, null, value);
134         }
135         return null; // remove debug info
136 }
137
138     public MethodVisitor visitMethod(
139         final int access,
140         final String JavaDoc name,
141         final String JavaDoc desc,
142         final String JavaDoc signature,
143         final String JavaDoc[] exceptions)
144     {
145         if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
146             return new MethodOptimizer(cv.visitMethod(access,
147                     mapping.map(className + "." + name + desc),
148                     mapping.fix(desc),
149                     null,
150                     exceptions), mapping);
151         } else {
152             return new MethodOptimizer(cv.visitMethod(access,
153                     name,
154                     desc,
155                     null,
156                     exceptions), mapping);
157         }
158     }
159 }
160
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