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1 package org.apache.bcel.classfile; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache BCEL" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * "Apache BCEL", nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 56 57 import org.apache.bcel.Constants; 58 import java.io.*; 59 60 /*** 61 * This class represents the table of exceptions that are thrown by a 62 * method. This attribute may be used once per method. The name of 63 * this class is <em>ExceptionTable</em> for historical reasons; The 64 * Java Virtual Machine Specification, Second Edition defines this 65 * attribute using the name <em>Exceptions</em> (which is inconsistent 66 * with the other classes). 67 * 68 * @version $Id: ExceptionTable.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $ 69 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 70 * @see Code 71 */ 72 public final class ExceptionTable extends Attribute { 73 private int number_of_exceptions; // Table of indices into 74 private int[] exception_index_table; // constant pool 75 76 /*** 77 * Initialize from another object. Note that both objects use the same 78 * references (shallow copy). Use copy() for a physical copy. 79 */ 80 public ExceptionTable(ExceptionTable c) { 81 this(c.getNameIndex(), c.getLength(), c.getExceptionIndexTable(), 82 c.getConstantPool()); 83 } 84 85 /*** 86 * @param name_index Index in constant pool 87 * @param length Content length in bytes 88 * @param exception_index_table Table of indices in constant pool 89 * @param constant_pool Array of constants 90 */ 91 public ExceptionTable(int name_index, int length, 92 int[] exception_index_table, 93 ConstantPool constant_pool) 94 { 95 super(Constants.ATTR_EXCEPTIONS, name_index, length, constant_pool); 96 setExceptionIndexTable(exception_index_table); 97 } 98 99 /*** 100 * Construct object from file stream. 101 * @param name_index Index in constant pool 102 * @param length Content length in bytes 103 * @param file Input stream 104 * @param constant_pool Array of constants 105 * @throws IOException 106 */ 107 ExceptionTable(int name_index, int length, DataInputStream file, 108 ConstantPool constant_pool) throws IOException 109 { 110 this(name_index, length, (int[])null, constant_pool); 111 112 number_of_exceptions = file.readUnsignedShort(); 113 exception_index_table = new int[number_of_exceptions]; 114 115 for(int i=0; i < number_of_exceptions; i++) 116 exception_index_table[i] = file.readUnsignedShort(); 117 } 118 119 /*** 120 * Called by objects that are traversing the nodes of the tree implicitely 121 * defined by the contents of a Java class. I.e., the hierarchy of methods, 122 * fields, attributes, etc. spawns a tree of objects. 123 * 124 * @param v Visitor object 125 */ 126 public void accept(Visitor v) { 127 v.visitExceptionTable(this); 128 } 129 130 /*** 131 * Dump exceptions attribute to file stream in binary format. 132 * 133 * @param file Output file stream 134 * @throws IOException 135 */ 136 public final void dump(DataOutputStream file) throws IOException 137 { 138 super.dump(file); 139 file.writeShort(number_of_exceptions); 140 for(int i=0; i < number_of_exceptions; i++) 141 file.writeShort(exception_index_table[i]); 142 } 143 144 /*** 145 * @return Array of indices into constant pool of thrown exceptions. 146 */ 147 public final int[] getExceptionIndexTable() {return exception_index_table;} 148 /*** 149 * @return Length of exception table. 150 */ 151 public final int getNumberOfExceptions() { return number_of_exceptions; } 152 153 /*** 154 * @return class names of thrown exceptions 155 */ 156 public final String[] getExceptionNames() { 157 String[] names = new String[number_of_exceptions]; 158 for(int i=0; i < number_of_exceptions; i++) 159 names[i] = constant_pool.getConstantString(exception_index_table[i], 160 Constants.CONSTANT_Class). 161 replace('/', '.'); 162 return names; 163 } 164 165 /*** 166 * @param exception_index_table. 167 * Also redefines number_of_exceptions according to table length. 168 */ 169 public final void setExceptionIndexTable(int[] exception_index_table) { 170 this.exception_index_table = exception_index_table; 171 number_of_exceptions = (exception_index_table == null)? 0 : 172 exception_index_table.length; 173 } 174 /*** 175 * @return String representation, i.e., a list of thrown exceptions. 176 */ 177 public final String toString() { 178 StringBuffer buf = new StringBuffer(""); 179 String str; 180 181 for(int i=0; i < number_of_exceptions; i++) { 182 str = constant_pool.getConstantString(exception_index_table[i], 183 Constants.CONSTANT_Class); 184 buf.append(Utility.compactClassName(str, false)); 185 186 if(i < number_of_exceptions - 1) 187 buf.append(", "); 188 } 189 190 return buf.toString(); 191 } 192 193 /*** 194 * @return deep copy of this attribute 195 */ 196 public Attribute copy(ConstantPool constant_pool) { 197 ExceptionTable c = (ExceptionTable)clone(); 198 c.exception_index_table = (int[])exception_index_table.clone(); 199 c.constant_pool = constant_pool; 200 return c; 201 } 202 }

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