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


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: LineNumberTableAttrInfo.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 LineNumberTableAttrInfo extends AttrInfo {
37   /** Holds the length of the line number table. */
38   private int lineNumberTableLength;
39   /** Array that holds the line numbers. */
40   private LineNumberInfo[] lineNumberTable;
41   
42   
43   
44   
45   /** Default constructor that creates a LineNumberTableAttrInfo 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 LineNumberTableAttrInfo(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_LineNumberTable;
62   }
63   
64   
65   
66   
67   /** Sets the length of the line number table.
68    * @param len the length of the line number table
69    * @see #getLineNumberTableLength
70    */
71   protected void setLineNumberTableLength(int len) {
72     this.lineNumberTableLength = len;
73   }
74   
75   
76   /** Returns the length of the line number table.
77    * @return length of the line number table
78    * @see #setLineNumberTableLength
79    */
80   protected int getLineNumberTableLength() {
81     return lineNumberTableLength;
82   }
83   
84   
85   
86   
87   /** Sets the line number table.
88    * @param table array that holds the line number information
89    * @see #getLineNumberTable
90    */
91   protected void setLineNumberTable(LineNumberInfo[] table) {
92     lineNumberTable = table;
93   }
94   
95   
96   /** Returns the line number table.
97    * @return line number table
98    * @see #setLineNumberTable
99    */
100   protected LineNumberInfo[] getLineNumberTable() {
101     return lineNumberTable;
102   }
103   
104   
105   
106   
107   /** Read the data following the header.
108    * @param din the input stream
109    * @throws IOException if an I/O error occurs
110    */
111   protected void readInfo(DataInput din)
112   throws IOException {
113     setLineNumberTableLength(din.readUnsignedShort());
114     LineNumberInfo[] table = new LineNumberInfo[getLineNumberTableLength()];
115     for (int i = 0; i < getLineNumberTableLength(); i++) {
116       table[i] = LineNumberInfo.create(din);
117     }
118     setLineNumberTable(table);
119   }
120   
121   
122   /** Export data following the header to a DataOutput stream. Should be
123    * overwritten in subclasses.
124    * @param dout the output stream
125    * @throws IOException if an I/O error occurs
126    */
127   public void writeInfo(DataOutput dout)
128   throws IOException {
129     dout.writeShort(getLineNumberTableLength());
130     for (int i = 0; i < getLineNumberTableLength(); i++) {
131       getLineNumberTable()[i].write(dout);
132     }
133   }
134   
135   
136   
137   
138   /** Dump the content of the entry to the specified file (used for debugging).
139    * @param pw the print writer
140    * @param cf the class file the element belongs to
141    */
142   public void dump(PrintWriter pw, ClassFile cf) {
143     pw.println(getAttrName());
144     pw.print("Number of entries: ");
145     pw.println(getLineNumberTableLength());
146     for (int i=0; i<getLineNumberTableLength(); i++) {
147       getLineNumberTable()[i].dump(pw, cf);
148     }
149   }
150 }
151
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