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


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 attribute.
33  *
34  * @author Mark Welsh
35  */
36 public class LocalVariableTableAttrInfo extends AttrInfo
37 {
38     // Constants -------------------------------------------------------------
39
40
41     // Fields ----------------------------------------------------------------
42 private int u2localVariableTableLength;
43     private LocalVariableInfo[] localVariableTable;
44
45
46     // Class Methods ---------------------------------------------------------
47
48
49     // Instance Methods ------------------------------------------------------
50 protected LocalVariableTableAttrInfo(ClassFile cf, int attrNameIndex, int attrLength)
51     {
52         super(cf, attrNameIndex, attrLength);
53     }
54
55     /** Return the String name of the attribute; over-ride this in sub-classes. */
56     protected String JavaDoc getAttrName()
57     {
58         return ATTR_LocalVariableTable;
59     }
60
61     /** Return the array of local variable table entries. */
62     protected LocalVariableInfo[] getLocalVariableTable()
63     {
64         return localVariableTable;
65     }
66
67     public void setLocalVariableTable(LocalVariableInfo[] lvts) {
68       this.localVariableTable = lvts;
69       this.u2localVariableTableLength = lvts.length;
70       this.u4attrLength = 2 + 10 * u2localVariableTableLength;
71     }
72
73     /** Check for Utf8 references in the 'info' data to the constant pool and mark them. */
74     protected void markUtf8RefsInInfo(ConstantPool pool)
75     {
76         for (int i = 0; i < localVariableTable.length; i++)
77         {
78             localVariableTable[i].markUtf8Refs(pool);
79         }
80     }
81
82     /** Read the data following the header. */
83     protected void readInfo(DataInput din) throws java.io.IOException JavaDoc
84     {
85         u2localVariableTableLength = din.readUnsignedShort();
86         localVariableTable = new LocalVariableInfo[u2localVariableTableLength];
87         for (int i = 0; i < u2localVariableTableLength; i++)
88         {
89             localVariableTable[i] = LocalVariableInfo.create(din);
90         }
91     }
92
93     /** Export data following the header to a DataOutput stream. */
94     public void writeInfo(DataOutput dout) throws java.io.IOException JavaDoc
95     {
96         dout.writeShort(u2localVariableTableLength);
97         for (int i = 0; i < u2localVariableTableLength; i++)
98         {
99             localVariableTable[i].write(dout);
100         }
101     }
102
103 }
104
105
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