1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  *             of Java bytecode.
4  *
5  * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This program 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 program 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 General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with this program; if not, write to the Free Software Foundation, Inc.,
19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.classfile.attribute;
22 
23 import proguard.classfile.*;
24 import proguard.classfile.attribute.visitor.AttributeVisitor;
25 import proguard.classfile.visitor.ClassVisitor;
26 
27 /**
28  * This Attribute represents a signature attribute.
29  *
30  * @author Eric Lafortune
31  */
32 public class SignatureAttribute extends Attribute
33 {
34     public int u2signatureIndex;
35 
36     /**
37      * An extra field pointing to the Clazz objects referenced in the
38      * signature string. This field is filled out by the <code>{@link
39      * proguard.classfile.util.ClassReferenceInitializer ClassReferenceInitializer}</code>.
40      * References to primitive types are ignored.
41      */
42     public Clazz[] referencedClasses;
43 
44 
45     /**
46      * Creates an uninitialized SignatureAttribute.
47      */
SignatureAttribute()48     public SignatureAttribute()
49     {
50     }
51 
52 
53     /**
54      * Creates an initialized SignatureAttribute.
55      */
SignatureAttribute(int u2attributeNameIndex, int u2signatureIndex)56     public SignatureAttribute(int u2attributeNameIndex,
57                               int u2signatureIndex)
58     {
59         super(u2attributeNameIndex);
60 
61         this.u2signatureIndex = u2signatureIndex;
62     }
63 
64 
65     /**
66      * Returns the signature.
67      */
getSignature(Clazz clazz)68     public String getSignature(Clazz clazz)
69     {
70         return clazz.getString(u2signatureIndex);
71     }
72 
73 
74     /**
75      * Lets the Clazz objects referenced in the signature string accept the
76      * given visitor.
77      */
referencedClassesAccept(ClassVisitor classVisitor)78     public void referencedClassesAccept(ClassVisitor classVisitor)
79     {
80         if (referencedClasses != null)
81         {
82             for (int index = 0; index < referencedClasses.length; index++)
83             {
84                 if (referencedClasses[index] != null)
85                 {
86                     referencedClasses[index].accept(classVisitor);
87                 }
88             }
89         }
90     }
91 
92 
93     // Implementations for Attribute.
94 
accept(Clazz clazz, AttributeVisitor attributeVisitor)95     public void accept(Clazz clazz, AttributeVisitor attributeVisitor)
96     {
97         attributeVisitor.visitSignatureAttribute(clazz, this);
98     }
99 
accept(Clazz clazz, Field field, AttributeVisitor attributeVisitor)100     public void accept(Clazz clazz, Field field, AttributeVisitor attributeVisitor)
101     {
102         attributeVisitor.visitSignatureAttribute(clazz, field, this);
103     }
104 
accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor)105     public void accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor)
106     {
107         attributeVisitor.visitSignatureAttribute(clazz, method, this);
108     }
109  }
110