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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.constant;
     22 
     23 import proguard.classfile.*;
     24 import proguard.classfile.visitor.*;
     25 
     26 /**
     27  * This Constant represents a ref constant in the constant pool.
     28  *
     29  * @author Eric Lafortune
     30  */
     31 public abstract class RefConstant extends Constant
     32 {
     33     public int u2classIndex;
     34     public int u2nameAndTypeIndex;
     35 
     36     /**
     37      * An extra field pointing to the referenced Clazz object.
     38      * This field is typically filled out by the <code>{@link
     39      * proguard.classfile.util.ClassReferenceInitializer
     40      * ClassReferenceInitializer}</code>.
     41      */
     42     public Clazz referencedClass;
     43 
     44     /**
     45      * An extra field optionally pointing to the referenced Member object.
     46      * This field is typically filled out by the <code>{@link
     47      * proguard.classfile.util.ClassReferenceInitializer
     48      * ClassReferenceInitializer}</code>.
     49      */
     50     public Member referencedMember;
     51 
     52 
     53     protected RefConstant()
     54     {
     55     }
     56 
     57 
     58     /**
     59      * Returns the class index.
     60      */
     61     public int getClassIndex()
     62     {
     63         return u2classIndex;
     64     }
     65 
     66     /**
     67      * Returns the name-and-type index.
     68      */
     69     public int getNameAndTypeIndex()
     70     {
     71         return u2nameAndTypeIndex;
     72     }
     73 
     74     /**
     75      * Sets the name-and-type index.
     76      */
     77     public void setNameAndTypeIndex(int index)
     78     {
     79         u2nameAndTypeIndex = index;
     80     }
     81 
     82     /**
     83      * Returns the class name.
     84      */
     85     public String getClassName(Clazz clazz)
     86     {
     87         return clazz.getClassName(u2classIndex);
     88     }
     89 
     90     /**
     91      * Returns the method/field name.
     92      */
     93     public String getName(Clazz clazz)
     94     {
     95         return clazz.getName(u2nameAndTypeIndex);
     96     }
     97 
     98     /**
     99      * Returns the type.
    100      */
    101     public String getType(Clazz clazz)
    102     {
    103         return clazz.getType(u2nameAndTypeIndex);
    104     }
    105 
    106 
    107     /**
    108      * Lets the referenced class accept the given visitor.
    109      */
    110     public void referencedClassAccept(ClassVisitor classVisitor)
    111     {
    112         if (referencedClass != null)
    113         {
    114             referencedClass.accept(classVisitor);
    115         }
    116     }
    117 
    118 
    119     /**
    120      * Lets the referenced class member accept the given visitor.
    121      */
    122     public void referencedMemberAccept(MemberVisitor memberVisitor)
    123     {
    124         if (referencedMember != null)
    125         {
    126             referencedMember.accept(referencedClass,
    127                                     memberVisitor);
    128         }
    129     }
    130 }
    131