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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2009 Eric Lafortune (eric (at) 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      */
     48     public SignatureAttribute()
     49     {
     50     }
     51 
     52 
     53     /**
     54      * Creates an initialized SignatureAttribute.
     55      */
     56     public SignatureAttribute(int u2attributeNameIndex,
     57                               int u2signatureIndex)
     58     {
     59         super(u2attributeNameIndex);
     60 
     61         this.u2signatureIndex = u2signatureIndex;
     62     }
     63 
     64 
     65     /**
     66      * Lets the Clazz objects referenced in the signature string accept the
     67      * given visitor.
     68      */
     69     public void referencedClassesAccept(ClassVisitor classVisitor)
     70     {
     71         if (referencedClasses != null)
     72         {
     73             for (int index = 0; index < referencedClasses.length; index++)
     74             {
     75                 if (referencedClasses[index] != null)
     76                 {
     77                     referencedClasses[index].accept(classVisitor);
     78                 }
     79             }
     80         }
     81     }
     82 
     83 
     84     // Implementations for Attribute.
     85 
     86     public void accept(Clazz clazz, AttributeVisitor attributeVisitor)
     87     {
     88         attributeVisitor.visitSignatureAttribute(clazz, this);
     89     }
     90 
     91     public void accept(Clazz clazz, Field field, AttributeVisitor attributeVisitor)
     92     {
     93         attributeVisitor.visitSignatureAttribute(clazz, field, this);
     94     }
     95 
     96     public void accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor)
     97     {
     98         attributeVisitor.visitSignatureAttribute(clazz, method, this);
     99     }
    100  }
    101