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Java > Open Source Codes > proguard > classfile > editor > AttributeSorter


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This library is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This library is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.classfile.editor;
22
23 import proguard.classfile.*;
24 import proguard.classfile.util.SimplifiedVisitor;
25 import proguard.classfile.attribute.*;
26 import proguard.classfile.attribute.visitor.AttributeVisitor;
27 import proguard.classfile.visitor.*;
28
29 import java.util.*;
30
31 /**
32  * This ClassVisitor sorts the attributes of the classes that it visits.
33  * The sorting order is based on the types of the attributes.
34  *
35  * @author Eric Lafortune
36  */
37 public class AttributeSorter
38 extends SimplifiedVisitor
39 implements ClassVisitor, MemberVisitor, AttributeVisitor, Comparator
40 {
41     // Implementations for ClassVisitor.
42
43     public void visitProgramClass(ProgramClass programClass)
44     {
45         // Sort the attributes.
46 Arrays.sort(programClass.attributes, 0, programClass.u2attributesCount, this);
47
48         // Sort the attributes of the class members.
49 programClass.fieldsAccept(this);
50         programClass.methodsAccept(this);
51     }
52
53
54     // Implementations for MemberVisitor.
55
56     public void visitProgramMember(ProgramClass programClass, ProgramMember programMember)
57     {
58         // Sort the attributes.
59 Arrays.sort(programMember.attributes, 0, programMember.u2attributesCount, this);
60
61         // Sort the attributes of the attributes.
62 programMember.attributesAccept(programClass, this);
63     }
64
65
66     // Implementations for AttributeVisitor.
67
68     public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
69
70
71     public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
72     {
73         // Sort the attributes.
74 Arrays.sort(codeAttribute.attributes, 0, codeAttribute.u2attributesCount, this);
75     }
76
77
78     // Implementations for Comparator.
79
80     public int compare(Object JavaDoc object1, Object JavaDoc object2)
81     {
82         Attribute attribute1 = (Attribute)object1;
83         Attribute attribute2 = (Attribute)object2;
84
85         return attribute1.u2attributeNameIndex < attribute2.u2attributeNameIndex ? -1 :
86                attribute1.u2attributeNameIndex > attribute2.u2attributeNameIndex ? 1 :
87                                                                                     0;
88     }
89 }
90
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