1 | /******************************************************************************* |
2 | * Copyright (c) 2007, 2008 IBM Corporation and others. |
3 | * All rights reserved. This program and the accompanying materials |
4 | * are made available under the terms of the Eclipse Public License v1.0 |
5 | * which accompanies this distribution, and is available at |
6 | * http://www.eclipse.org/legal/epl-v10.html |
7 | * |
8 | * Contributors: |
9 | * IBM Corporation - initial API and implementation |
10 | *******************************************************************************/ |
11 | package org.eclipse.pde.api.tools.internal.comparator; |
12 | |
13 | import org.objectweb.asm.signature.SignatureVisitor; |
14 | |
15 | /** |
16 | * This class is used to decode a generic signature for class or method |
17 | */ |
18 | final class SignatureDecoder implements SignatureVisitor { |
19 | static final int CLASS_BOUND = 1; |
20 | static final int DEFAULT = 0; |
21 | static final int INTERFACE_BOUND = 2; |
22 | static final int SUPER_CLASS = 3; |
23 | static final int NORMAL_TYPE_ARGUMENT = 4; |
24 | static final int EXTENDS_TYPE_ARGUMENT = 5; |
25 | static final int SUPER_TYPE_ARGUMENT = 6; |
26 | |
27 | int mode = DEFAULT; |
28 | SignatureDescriptor signatureDescriptor; |
29 | |
30 | public SignatureDecoder(SignatureDescriptor signatureDescriptor) { |
31 | this.signatureDescriptor = signatureDescriptor; |
32 | } |
33 | public SignatureVisitor visitArrayType() { |
34 | return this; |
35 | } |
36 | |
37 | public void visitBaseType(char descriptor) { |
38 | // nothing to do |
39 | } |
40 | |
41 | public SignatureVisitor visitClassBound() { |
42 | this.mode = CLASS_BOUND; |
43 | return this; |
44 | } |
45 | |
46 | public void visitClassType(String name) { |
47 | String classTypeName = name.replace('/', '.'); |
48 | switch(this.mode) { |
49 | case CLASS_BOUND : |
50 | this.signatureDescriptor.setClassBound(classTypeName); |
51 | break; |
52 | case INTERFACE_BOUND : |
53 | this.signatureDescriptor.addInterfaceBound(classTypeName); |
54 | break; |
55 | case SUPER_CLASS : |
56 | this.signatureDescriptor.setSuperclass(classTypeName); |
57 | break; |
58 | case EXTENDS_TYPE_ARGUMENT : |
59 | case SUPER_TYPE_ARGUMENT : |
60 | case NORMAL_TYPE_ARGUMENT : |
61 | this.signatureDescriptor.addTypeArgument(classTypeName); |
62 | break; |
63 | } |
64 | this.mode = DEFAULT; |
65 | } |
66 | |
67 | public void visitEnd() { |
68 | // nothing to do |
69 | } |
70 | |
71 | public SignatureVisitor visitExceptionType() { |
72 | // nothing to do |
73 | return this; |
74 | } |
75 | |
76 | public void visitFormalTypeParameter(String name) { |
77 | this.signatureDescriptor.addTypeParameterDescriptor(name); |
78 | } |
79 | |
80 | public void visitInnerClassType(String name) { |
81 | } |
82 | |
83 | public SignatureVisitor visitInterface() { |
84 | return this; |
85 | } |
86 | |
87 | public SignatureVisitor visitInterfaceBound() { |
88 | this.mode = INTERFACE_BOUND; |
89 | return this; |
90 | } |
91 | |
92 | public SignatureVisitor visitParameterType() { |
93 | return this; |
94 | } |
95 | |
96 | public SignatureVisitor visitReturnType() { |
97 | return this; |
98 | } |
99 | |
100 | public SignatureVisitor visitSuperclass() { |
101 | this.mode = SUPER_CLASS; |
102 | return this; |
103 | } |
104 | |
105 | public void visitTypeArgument() { |
106 | } |
107 | |
108 | public SignatureVisitor visitTypeArgument(char wildcard) { |
109 | switch(wildcard) { |
110 | case SignatureVisitor.EXTENDS : |
111 | this.mode= EXTENDS_TYPE_ARGUMENT; |
112 | break; |
113 | case SignatureVisitor.SUPER : |
114 | this.mode= SUPER_TYPE_ARGUMENT; |
115 | break; |
116 | case SignatureVisitor.INSTANCEOF : |
117 | this.mode= NORMAL_TYPE_ARGUMENT; |
118 | } |
119 | return this; |
120 | } |
121 | |
122 | public void visitTypeVariable(String name) { |
123 | } |
124 | } |