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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2013 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.visitor.ClassVisitor;
     25 
     26 /**
     27  * Representation of an Local Variable table entry.
     28  *
     29  * @author Eric Lafortune
     30  */
     31 public class LocalVariableInfo implements VisitorAccepter, Comparable
     32 {
     33     public int u2startPC;
     34     public int u2length;
     35     public int u2nameIndex;
     36     public int u2descriptorIndex;
     37     public int u2index;
     38 
     39     /**
     40      * An extra field pointing to the referenced Clazz object.
     41      * This field is typically filled out by the <code>{@link
     42      * proguard.classfile.util.ClassReferenceInitializer
     43      * ClassReferenceInitializer}</code>.
     44      */
     45     public Clazz referencedClass;
     46 
     47     /**
     48      * An extra field in which visitors can store information.
     49      */
     50     public Object visitorInfo;
     51 
     52 
     53     /**
     54      * Creates an uninitialized LocalVariableInfo.
     55      */
     56     public LocalVariableInfo()
     57     {
     58     }
     59 
     60 
     61     /**
     62      * Creates an initialized LocalVariableInfo.
     63      */
     64     public LocalVariableInfo(int   u2startPC,
     65                              int   u2length,
     66                              int   u2nameIndex,
     67                              int   u2descriptorIndex,
     68                              int   u2index)
     69     {
     70         this.u2startPC         = u2startPC;
     71         this.u2length          = u2length;
     72         this.u2nameIndex       = u2nameIndex;
     73         this.u2descriptorIndex = u2descriptorIndex;
     74         this.u2index           = u2index;
     75     }
     76 
     77 
     78     /**
     79      * Lets the referenced class accept the given visitor.
     80      */
     81     public void referencedClassAccept(ClassVisitor classVisitor)
     82     {
     83         if (referencedClass != null)
     84         {
     85             referencedClass.accept(classVisitor);
     86         }
     87     }
     88 
     89 
     90     // Implementations for VisitorAccepter.
     91 
     92     public Object getVisitorInfo()
     93     {
     94         return visitorInfo;
     95     }
     96 
     97     public void setVisitorInfo(Object visitorInfo)
     98     {
     99         this.visitorInfo = visitorInfo;
    100     }
    101 
    102 
    103     // Implementations for Comparable.
    104 
    105     public int compareTo(Object object)
    106     {
    107         LocalVariableInfo other = (LocalVariableInfo)object;
    108 
    109         return
    110             this.u2startPC          < other.u2startPC          ? -1 : this.u2startPC          > other.u2startPC          ? 1 :
    111             this.u2index            < other.u2index            ? -1 : this.u2index            > other.u2index            ? 1 :
    112             this.u2length           < other.u2length           ? -1 : this.u2length           > other.u2length           ? 1 :
    113             this.u2descriptorIndex  < other.u2descriptorIndex  ? -1 : this.u2descriptorIndex  > other.u2descriptorIndex  ? 1 :
    114             this.u2nameIndex        < other.u2nameIndex        ? -1 : this.u2nameIndex        > other.u2nameIndex        ? 1 :
    115                                                                                                                            0;
    116     }
    117 }
    118