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Java > Open Source Codes > com > yworks > yguard > obf > classfile > LocalVariableInfo


1 /**
2  * YGuard -- an obfuscation library for Java(TM) classfiles.
3  *
4  * Original Copyright (c) 1999 Mark Welsh (markw@retrologic.com)
5  * Modifications Copyright (c) 2002 yWorks GmbH (yguard@yworks.com)
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  *
21  * The author may be contacted at yguard@yworks.com
22  *
23  * Java and all Java-based marks are trademarks or registered
24  * trademarks of Sun Microsystems, Inc. in the U.S. and other countries.
25  */
26 package com.yworks.yguard.obf.classfile;
27
28 import java.io.*;
29 import java.util.*;
30
31 /**
32  * Representation of an Local Variable table entry.
33  *
34  * @author Mark Welsh
35  */
36 public class LocalVariableInfo
37 {
38     // Constants -------------------------------------------------------------
39
40
41     // Fields ----------------------------------------------------------------
42 private int u2startpc;
43     private int u2length;
44     private int u2nameIndex;
45     private int u2descriptorIndex;
46     private int u2index;
47
48
49     // Class Methods ---------------------------------------------------------
50 public static LocalVariableInfo create(DataInput din) throws java.io.IOException JavaDoc
51     {
52       if (din == null) throw new NullPointerException JavaDoc("DataInput cannot be null!");
53         LocalVariableInfo lvi = new LocalVariableInfo();
54         lvi.read(din);
55         return lvi;
56     }
57
58
59     // Instance Methods ------------------------------------------------------
60 private LocalVariableInfo() {}
61
62     /** Return name index into Constant Pool. */
63     protected int getNameIndex() {return u2nameIndex;}
64
65     /** Set the name index. */
66     protected void setNameIndex(int index) {u2nameIndex = index;}
67
68     /** Return descriptor index into Constant Pool. */
69     protected int getDescriptorIndex() {return u2descriptorIndex;}
70
71     /** Set the descriptor index. */
72     protected void setDescriptorIndex(int index) {u2descriptorIndex = index;}
73
74     /** Check for Utf8 references to constant pool and mark them. */
75     protected void markUtf8Refs(ConstantPool pool)
76     {
77         pool.incRefCount(u2nameIndex);
78         pool.incRefCount(u2descriptorIndex);
79     }
80
81     private void read(DataInput din) throws java.io.IOException JavaDoc
82     {
83         u2startpc = din.readUnsignedShort();
84         u2length = din.readUnsignedShort();
85         u2nameIndex = din.readUnsignedShort();
86         u2descriptorIndex = din.readUnsignedShort();
87         u2index = din.readUnsignedShort();
88     }
89
90     /** Export the representation to a DataOutput stream. */
91     public void write(DataOutput dout) throws java.io.IOException JavaDoc
92     {
93         dout.writeShort(u2startpc);
94         dout.writeShort(u2length);
95         dout.writeShort(u2nameIndex);
96         dout.writeShort(u2descriptorIndex);
97         dout.writeShort(u2index);
98     }
99 }
100
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