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Java > Open Source Codes > com > go > trove > classfile > ExceptionsAttr


1 /* ====================================================================
2  * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
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52
53 package com.go.trove.classfile;
54
55 import java.util.*;
56 import java.io.*;
57
58 /******************************************************************************
59  * This class corresponds to the Exceptions_attribute structure as defined in
60  * section 4.7.5 of <i>The Java Virtual Machine Specification</i>.
61  *
62  * @author Brian S O'Neill
63  * @version
64  * <!--$$Revision:--> 25 <!-- $-->, <!--$$JustDate:--> 00/11/27 <!-- $-->
65  */

66 class ExceptionsAttr extends Attribute {
67     private List mExceptions = new ArrayList(2);
68     
69     public ExceptionsAttr(ConstantPool cp) {
70         super(cp, EXCEPTIONS);
71     }
72     
73     public String JavaDoc[] getExceptions() {
74         int size = mExceptions.size();
75         String JavaDoc[] names = new String JavaDoc[size];
76
77         for (int i=0; i<size; i++) {
78             names[i] = ((ConstantClassInfo)mExceptions.get(i)).getClassName();
79         }
80
81         return names;
82     }
83
84     public void addException(ConstantClassInfo type) {
85         mExceptions.add(type);
86     }
87     
88     public int getLength() {
89         return 2 + 2 * mExceptions.size();
90     }
91     
92     public void writeDataTo(DataOutput dout) throws IOException {
93         int size = mExceptions.size();
94         dout.writeShort(size);
95         for (int i=0; i<size; i++) {
96             ConstantClassInfo info = (ConstantClassInfo)mExceptions.get(i);
97             dout.writeShort(info.getIndex());
98         }
99     }
100
101     static Attribute define(ConstantPool cp,
102                             String JavaDoc name,
103                             int length,
104                             DataInput din) throws IOException {
105
106         ExceptionsAttr attr = new ExceptionsAttr(cp);
107         
108         int size = din.readUnsignedShort();
109         length -= 2;
110
111         for (int i=0; i<size; i++) {
112             int index = din.readUnsignedShort();
113             length -= 2;
114             ConstantClassInfo info = (ConstantClassInfo)cp.getConstant(index);
115             attr.addException(info);
116         }
117
118         if (length > 0) {
119             din.skipBytes(length);
120         }
121         
122         return attr;
123     }
124 }
125
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