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Java > Open Source Codes > org > gjt > jclasslib > structures > attributes > ExceptionsAttribute


1 /*
2     This library is free software; you can redistribute it and/or
3     modify it under the terms of the GNU General Public
4     License as published by the Free Software Foundation; either
5     version 2 of the license, or (at your option) any later version.
6 */
7
8 package org.gjt.jclasslib.structures.attributes;
9
10 import org.gjt.jclasslib.structures.AttributeInfo;
11 import org.gjt.jclasslib.structures.InvalidByteCodeException;
12
13 import java.io.*;
14
15 /**
16     Describes an <tt>Exceptions</tt> attribute structure.
17
18     @author <a HREF="mailto:jclasslib@ej-technologies.com">Ingo Kegel</a>
19     @version $Revision: 1.4 $ $Date: 2003/08/18 07:52:05 $
20 */
21 public class ExceptionsAttribute extends AttributeInfo {
22
23     /** Name of the attribute as in the corresponding constant pool entry. */
24     public static final String JavaDoc ATTRIBUTE_NAME = "Exceptions";
25
26     private static final int INITIAL_LENGTH = 2;
27     
28     private int[] exceptionIndexTable;
29     
30     /**
31         Get the list of exceptions thrown by the parent <tt>Code</tt> attribute
32         as an array of indices into the constant pool.
33         @return the array
34      */
35     public int[] getExceptionIndexTable() {
36         return exceptionIndexTable;
37     }
38
39     /**
40         Set the list of exceptions thrown by the parent <tt>Code</tt> attribute
41         as an array of indices into the constant pool.
42         @param exceptionIndexTable the array
43      */
44     public void setExceptionIndexTable(int[] exceptionIndexTable) {
45         this.exceptionIndexTable = exceptionIndexTable;
46     }
47
48     public void read(DataInput in)
49         throws InvalidByteCodeException, IOException {
50             
51         int numberOfExceptions = in.readUnsignedShort();
52         exceptionIndexTable = new int[numberOfExceptions];
53         for (int i = 0 ; i < numberOfExceptions; i++) {
54             exceptionIndexTable[i] = in.readUnsignedShort();
55         }
56         
57         if (debug) debug("read ");
58     }
59
60     public void write(DataOutput out)
61         throws InvalidByteCodeException, IOException {
62         
63         super.write(out);
64
65         int numberOfExceptions = getLength(exceptionIndexTable);
66
67         out.writeShort(numberOfExceptions);
68         for (int i = 0 ; i < numberOfExceptions; i++) {
69             out.writeShort(exceptionIndexTable[i]);
70         }
71         if (debug) debug("wrote ");
72     }
73
74     public int getAttributeLength() {
75         return INITIAL_LENGTH + 2 * getLength(exceptionIndexTable);
76     }
77
78     protected void debug(String JavaDoc message) {
79         super.debug(message + "Exception attribute with " + getLength(exceptionIndexTable) + " exceptions");
80     }
81
82 }
83
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