KickJava   Java API By Example, From Geeks To Geeks.

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


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 a 'ref'-type entry in the ConstantPool.
33  *
34  * @author Mark Welsh
35  */
36 abstract public class RefCpInfo extends CpInfo
37 {
38     // Constants -------------------------------------------------------------
39
40
41     // Fields ----------------------------------------------------------------
42 private int u2classIndex;
43     private int u2nameAndTypeIndex;
44
45
46     // Class Methods ---------------------------------------------------------
47
48
49     // Instance Methods ------------------------------------------------------
50 protected RefCpInfo(int tag)
51     {
52         super(tag);
53     }
54
55     /** Return the class index. */
56     protected int getClassIndex() {return u2classIndex;}
57
58     /** Return the name-and-type index. */
59     protected int getNameAndTypeIndex() {return u2nameAndTypeIndex;}
60
61     /** Set the name-and-type index. */
62     protected void setNameAndTypeIndex(int index) {u2nameAndTypeIndex = index;}
63
64     /** Check for N+T references to constant pool and mark them. */
65     protected void markNTRefs(ConstantPool pool)
66     {
67         pool.incRefCount(u2nameAndTypeIndex);
68     }
69
70     /** Read the 'info' data following the u1tag byte. */
71     protected void readInfo(DataInput din) throws java.io.IOException JavaDoc
72     {
73         u2classIndex = din.readUnsignedShort();
74         u2nameAndTypeIndex = din.readUnsignedShort();
75     }
76
77     /** Write the 'info' data following the u1tag byte. */
78     protected void writeInfo(DataOutput dout) throws java.io.IOException JavaDoc
79     {
80         dout.writeShort(u2classIndex);
81         dout.writeShort(u2nameAndTypeIndex);
82     }
83
84     /** Dump the content of the class file to the specified file (used for debugging). */
85     public void dump(PrintWriter pw, ClassFile cf, int index)
86     {
87         pw.println(" Ref " + Integer.toString(index) + ": " + ((Utf8CpInfo)cf.getCpEntry(((ClassCpInfo)cf.getCpEntry(u2classIndex)).getNameIndex())).getString() +
88                    " " + ((Utf8CpInfo)cf.getCpEntry(((NameAndTypeCpInfo)cf.getCpEntry(u2nameAndTypeIndex)).getNameIndex())).getString() +
89                    " " + ((Utf8CpInfo)cf.getCpEntry(((NameAndTypeCpInfo)cf.getCpEntry(u2nameAndTypeIndex)).getDescriptorIndex())).getString());
90     }
91 }
92
Popular Tags