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


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 LocalVariableTypeTableAttrInfo extends AttrInfo
37 {
38     // Constants -------------------------------------------------------------
39
40
41     // Fields ----------------------------------------------------------------
42 private int u2localVariableTypeTableLength;
43     private LocalVariableTypeInfo[] localVariableTypeTable;
44
45
46     // Class Methods ---------------------------------------------------------
47
48
49     // Instance Methods ------------------------------------------------------
50 protected LocalVariableTypeTableAttrInfo(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_LocalVariableTypeTable;
59     }
60
61     /** Return the array of local variable table entries. */
62     protected LocalVariableTypeInfo[] getLocalVariableTypeTable()
63     {
64         return localVariableTypeTable;
65     }
66     public void setLocalVariableTypeTable(LocalVariableTypeInfo[] lvts) {
67       this.localVariableTypeTable = lvts;
68       this.u2localVariableTypeTableLength = lvts.length;
69       this.u4attrLength = 2 + 10 * u2localVariableTypeTableLength;
70     }
71
72     /** Check for Utf8 references in the 'info' data to the constant pool and mark them. */
73     protected void markUtf8RefsInInfo(ConstantPool pool)
74     {
75         for (int i = 0; i < localVariableTypeTable.length; i++)
76         {
77             localVariableTypeTable[i].markUtf8Refs(pool);
78         }
79     }
80
81     /** Read the data following the header. */
82     protected void readInfo(DataInput din) throws java.io.IOException JavaDoc
83     {
84         u2localVariableTypeTableLength = din.readUnsignedShort();
85         localVariableTypeTable = new LocalVariableTypeInfo[u2localVariableTypeTableLength];
86         for (int i = 0; i < u2localVariableTypeTableLength; i++)
87         {
88             localVariableTypeTable[i] = LocalVariableTypeInfo.create(din);
89         }
90     }
91
92     /** Export data following the header to a DataOutput stream. */
93     public void writeInfo(DataOutput dout) throws java.io.IOException JavaDoc
94     {
95         dout.writeShort(u2localVariableTypeTableLength);
96         for (int i = 0; i < u2localVariableTypeTableLength; i++)
97         {
98             localVariableTypeTable[i].write(dout);
99         }
100     }
101
102 }
103
104
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