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


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 EnclosingMethodAttrInfo extends AttrInfo
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 EnclosingMethodAttrInfo(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_EnclosingMethod;
59     }
60
61     /** Return the class index. */
62     protected int getClassIndex() {return u2classIndex;}
63
64     /** Return the class index. */
65     protected void setClassIndex(int index) { this.u2classIndex = index; }
66
67     /** Return the name-and-type index. */
68     protected int getNameAndTypeIndex() {return u2nameAndTypeIndex;}
69
70     /** Set the name-and-type index. */
71     protected void setNameAndTypeIndex(int index) {u2nameAndTypeIndex = index;}
72
73     /**
74      * Check for Utf8 references in the 'info' data to the constant pool and
75      * mark them; over-ride this in sub-classes.
76      */
77     protected void markUtf8RefsInInfo(ConstantPool pool) {
78       //nothing to be done ClassCpInfo and NameAndTypeCpInfo are handled and marked
79 //automatically - their Utf8 references need no marking
80 // however we mark the NameAndTypeCpInfo here, although this should be done in markNTRefs however
81 // there is no markNTRefs for this class that might be called anywhere :-(
82 if (u2nameAndTypeIndex > 0){
83         NameAndTypeCpInfo ntcpi = (NameAndTypeCpInfo) pool.getCpEntry(u2nameAndTypeIndex);
84         ntcpi.incRefCount();
85       }
86       // does not seem to be necessary, since all ClassCpInfo will be remapped equally, so
87 // the reference counting is never used for ClassCpInfo...
88 // ClassCpInfo cpi = (ClassCpInfo) pool.getCpEntry(u2classIndex);
89 // cpi.incRefCount();
90 }
91     
92     
93     
94
95     /** Read the 'info' data following the u1tag byte. */
96     protected void readInfo(DataInput din) throws java.io.IOException JavaDoc
97     {
98         u2classIndex = din.readUnsignedShort();
99         u2nameAndTypeIndex = din.readUnsignedShort();
100     }
101
102     /** Write the 'info' data following the u1tag byte. */
103     public void writeInfo(DataOutput dout) throws java.io.IOException JavaDoc
104     {
105         dout.writeShort(u2classIndex);
106         dout.writeShort(u2nameAndTypeIndex);
107     }
108
109     /** Dump the content of the class file to the specified file (used for debugging). */
110     public void dump(PrintWriter pw, ClassFile cf, int index)
111     {
112         pw.println(" EnclosingMethod " );
113 // + Integer.toString(index) + ": " + ((Utf8CpInfo)cf.getCpEntry(((ClassCpInfo)cf.getCpEntry(u2classIndex)).getNameIndex())).getString() +
114 // " " + ((Utf8CpInfo)cf.getCpEntry(((NameAndTypeCpInfo)cf.getCpEntry(u2nameAndTypeIndex)).getNameIndex())).getString() +
115 // " " + ((Utf8CpInfo)cf.getCpEntry(((NameAndTypeCpInfo)cf.getCpEntry(u2nameAndTypeIndex)).getDescriptorIndex())).getString());
116 }
117 }
118
119
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