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Java > Open Source Codes > net > sf > javaguard > classfile > LocalVariableTableAttrInfo


1 /**
2  * JavaGuard -- an obfuscation package for Java classfiles.
3  *
4  * Copyright (c) 1999 Mark Welsh (markw@retrologic.com)
5  * Copyright (c) 2002 Thorsten Heit (theit@gmx.de)
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 theit@gmx.de.
22  *
23  *
24  * $Id: LocalVariableTableAttrInfo.java,v 1.2 2002/05/08 11:53:42 glurk Exp $
25  */

26 package net.sf.javaguard.classfile;
27
28 import java.io.*;
29
30
31 /** Representation of an attribute.
32  *
33  * @author <a HREF="mailto:theit@gmx.de">Thorsten Heit</a>
34  * @author <a HREF="mailto:markw@retrologic.com">Mark Welsh</a>
35  */

36 public class LocalVariableTableAttrInfo extends AttrInfo {
37   /** Holds the length of the local variable table. */
38   private int tableLength;
39   /** Array that contains the local variables. */
40   private LocalVariableInfo[] variableTable;
41   
42   
43   
44   
45   /** Default constructor that creates a LocalVariableTableAttrInfo object.
46    * @param cf the class file the object belongs to
47    * @param attrNameIndex index into the constant pool
48    * @param attrLength the length of the additional info data in the class file
49    */

50   protected LocalVariableTableAttrInfo(ClassFile cf, int attrNameIndex, int attrLength) {
51     super(cf, attrNameIndex, attrLength);
52   }
53   
54   
55   
56   
57   /** Return the string name of the attribute.
58    * @return string name of the attribute
59    */

60   protected String JavaDoc getAttrName() {
61     return ATTR_LocalVariableTable;
62   }
63   
64   
65   
66   
67   /** Sets the length of the local variable table.
68    * @param len the length of the local variable table
69    * @see #getTableLength
70    */

71   protected void setTableLength(int len) {
72     tableLength = len;
73   }
74   
75   
76   /** Returns the length of the local variable table.
77    * @return length of the local variable table
78    * @see #setTableLength
79    */

80   protected int getTableLength() {
81     return tableLength;
82   }
83   
84   
85   
86   /** Sets the array that contains the local variables.
87    * @param table array that contains the local variables
88    * @see #getLocalVariableTable
89    */

90   protected void setLocalVariableTable(LocalVariableInfo[] table) {
91     variableTable = table;
92   }
93   
94   
95   /** Returns the array that contains the local variables.
96    * @return array that contains the local variables
97    * @see #setLocalVariableTable
98    */

99   protected LocalVariableInfo[] getLocalVariableTable() {
100     return variableTable;
101   }
102   
103   
104   
105   
106   /** Check for Utf8 references in the 'info' data to the constant pool and
107    * mark them.
108    * @param pool the constant pool the element belongs to
109    */

110   protected void markUtf8RefsInInfo(ConstantPool pool) {
111     for (int i = 0; i < getTableLength(); i++) {
112       getLocalVariableTable()[i].markUtf8Refs(pool);
113     }
114   }
115   
116   
117   
118   
119   /** Read the data following the header.
120    * @param din the input stream
121    * @throws IOException if an I/O error occurs
122    */

123   protected void readInfo(DataInput din)
124   throws IOException {
125     setTableLength(din.readUnsignedShort());
126     LocalVariableInfo[] table = new LocalVariableInfo[getTableLength()];
127     for (int i = 0; i < getTableLength(); i++) {
128       table[i] = LocalVariableInfo.create(din);
129     }
130     setLocalVariableTable(table);
131   }
132   
133   
134   /** Export data following the header to a DataOutput stream. Should be
135    * overwritten in subclasses.
136    * @param dout the output stream
137    * @throws IOException if an I/O error occurs
138    */

139   public void writeInfo(DataOutput dout)
140   throws IOException {
141     dout.writeShort(getTableLength());
142     for (int i = 0; i < getTableLength(); i++) {
143       getLocalVariableTable()[i].write(dout);
144     }
145   }
146   
147   
148   
149   
150   /** Dump the content of the entry to the specified file (used for debugging).
151    * @param pw the print writer
152    * @param cf the class file the element belongs to
153    */

154   public void dump(PrintWriter pw, ClassFile cf) {
155     pw.println(getAttrName());
156     pw.print("Number of entries: ");
157     pw.println(getTableLength());
158     for (int i=0; i<getTableLength(); i++) {
159       getLocalVariableTable()[i].dump(pw, cf);
160     }
161   }
162 }
163
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