KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > proguard > classfile > instruction > SwitchInstruction


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 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.instruction;
22
23 import proguard.classfile.*;
24 import proguard.classfile.instruction.visitor.InstructionVisitor;
25 import proguard.classfile.attribute.CodeAttribute;
26
27 /**
28  * This Instruction represents a simple instruction without variable arguments
29  * or constant pool references.
30  *
31  * @author Eric Lafortune
32  */
33 public abstract class SwitchInstruction extends Instruction
34 {
35     public int defaultOffset;
36     public int[] jumpOffsets;
37
38
39     /**
40      * Creates an uninitialized SwitchInstruction.
41      */
42     public SwitchInstruction() {}
43
44
45     /**
46      * Creates a new SwitchInstruction with the given arguments.
47      */
48     public SwitchInstruction(byte opcode,
49                              int defaultOffset,
50                              int[] jumpOffsets)
51     {
52         this.opcode = opcode;
53         this.defaultOffset = defaultOffset;
54         this.jumpOffsets = jumpOffsets;
55     }
56
57
58     /**
59      * Copies the given instruction into this instruction.
60      * @param switchInstruction the instruction to be copied.
61      * @return this instruction.
62      */
63     public SwitchInstruction copy(SwitchInstruction switchInstruction)
64     {
65         this.opcode = switchInstruction.opcode;
66         this.defaultOffset = switchInstruction.defaultOffset;
67         this.jumpOffsets = switchInstruction.jumpOffsets;
68
69         return this;
70     }
71
72
73     // Implementations for Instruction.
74
75     public String JavaDoc toString(int offset)
76     {
77         return "["+offset+"] "+toString()+" (target="+(offset+defaultOffset)+")";
78     }
79
80
81     // Implementations for Object.
82
83     public String JavaDoc toString()
84     {
85         return getName()+" ("+jumpOffsets.length+" offsets, default="+defaultOffset+")";
86     }
87 }
88
Popular Tags