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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2014 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.constant.visitor.ConstantVisitor;
     25 import proguard.classfile.visitor.ClassVisitor;
     26 
     27 /**
     28  * This Constant represents a class constant in the constant pool.
     29  *
     30  * @author Eric Lafortune
     31  */
     32 public class ClassConstant extends Constant
     33 {
     34     public int u2nameIndex;
     35 
     36     /**
     37      * An extra field pointing to the referenced Clazz object.
     38      * This field is filled out by the <code>{@link
     39      * proguard.classfile.util.ClassReferenceInitializer ClassReferenceInitializer}</code>.
     40      */
     41     public Clazz referencedClass;
     42 
     43     /**
     44      * An extra field pointing to the java.lang.Class Clazz object.
     45      * This field is typically filled out by the <code>{@link
     46      * proguard.classfile.util.ClassReferenceInitializer
     47      * ClassReferenceInitializer}</code>..
     48      */
     49     public Clazz javaLangClassClass;
     50 
     51 
     52     /**
     53      * Creates an uninitialized ClassConstant.
     54      */
     55     public ClassConstant()
     56     {
     57     }
     58 
     59 
     60     /**
     61      * Creates a new ClassConstant with the given name index.
     62      * @param u2nameIndex     the index of the name in the constant pool.
     63      * @param referencedClass the referenced class.
     64      */
     65     public ClassConstant(int   u2nameIndex,
     66                          Clazz referencedClass)
     67     {
     68         this.u2nameIndex     = u2nameIndex;
     69         this.referencedClass = referencedClass;
     70     }
     71 
     72 
     73     /**
     74      * Returns the name.
     75      */
     76     public String getName(Clazz clazz)
     77     {
     78         return clazz.getString(u2nameIndex);
     79     }
     80 
     81 
     82     // Implementations for Constant.
     83 
     84     public int getTag()
     85     {
     86         return ClassConstants.CONSTANT_Class;
     87     }
     88 
     89     public void accept(Clazz clazz, ConstantVisitor constantVisitor)
     90     {
     91         constantVisitor.visitClassConstant(clazz, this);
     92     }
     93 
     94 
     95     /**
     96      * Lets the referenced class accept the given visitor.
     97      */
     98     public void referencedClassAccept(ClassVisitor classVisitor)
     99     {
    100         if (referencedClass != null)
    101         {
    102             referencedClass.accept(classVisitor);
    103         }
    104     }
    105 }
    106