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Diffstat (limited to 'src/java/org/apache/bcel/classfile/ExceptionTable.java')
-rw-r--r-- | src/java/org/apache/bcel/classfile/ExceptionTable.java | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/src/java/org/apache/bcel/classfile/ExceptionTable.java b/src/java/org/apache/bcel/classfile/ExceptionTable.java new file mode 100644 index 00000000..0f26b1f4 --- /dev/null +++ b/src/java/org/apache/bcel/classfile/ExceptionTable.java @@ -0,0 +1,202 @@ +package org.apache.bcel.classfile; + +/* ==================================================================== + * The Apache Software License, Version 1.1 + * + * Copyright (c) 2001 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Apache" and "Apache Software Foundation" and + * "Apache BCEL" must not be used to endorse or promote products + * derived from this software without prior written permission. For + * written permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * "Apache BCEL", nor may "Apache" appear in their name, without + * prior written permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * <http://www.apache.org/>. + */ + +import org.apache.bcel.Constants; +import java.io.*; + +/** + * This class represents the table of exceptions that are thrown by a + * method. This attribute may be used once per method. The name of + * this class is <em>ExceptionTable</em> for historical reasons; The + * Java Virtual Machine Specification, Second Edition defines this + * attribute using the name <em>Exceptions</em> (which is inconsistent + * with the other classes). + * + * @version $Id$ + * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> + * @see Code + */ +public final class ExceptionTable extends Attribute { + private int number_of_exceptions; // Table of indices into + private int[] exception_index_table; // constant pool + + /** + * Initialize from another object. Note that both objects use the same + * references (shallow copy). Use copy() for a physical copy. + */ + public ExceptionTable(ExceptionTable c) { + this(c.getNameIndex(), c.getLength(), c.getExceptionIndexTable(), + c.getConstantPool()); + } + + /** + * @param name_index Index in constant pool + * @param length Content length in bytes + * @param exception_index_table Table of indices in constant pool + * @param constant_pool Array of constants + */ + public ExceptionTable(int name_index, int length, + int[] exception_index_table, + ConstantPool constant_pool) + { + super(Constants.ATTR_EXCEPTIONS, name_index, length, constant_pool); + setExceptionIndexTable(exception_index_table); + } + + /** + * Construct object from file stream. + * @param name_index Index in constant pool + * @param length Content length in bytes + * @param file Input stream + * @param constant_pool Array of constants + * @throw IOException + */ + ExceptionTable(int name_index, int length, DataInputStream file, + ConstantPool constant_pool) throws IOException + { + this(name_index, length, (int[])null, constant_pool); + + number_of_exceptions = file.readUnsignedShort(); + exception_index_table = new int[number_of_exceptions]; + + for(int i=0; i < number_of_exceptions; i++) + exception_index_table[i] = file.readUnsignedShort(); + } + + /** + * Called by objects that are traversing the nodes of the tree implicitely + * defined by the contents of a Java class. I.e., the hierarchy of methods, + * fields, attributes, etc. spawns a tree of objects. + * + * @param v Visitor object + */ + public void accept(Visitor v) { + v.visitExceptionTable(this); + } + + /** + * Dump exceptions attribute to file stream in binary format. + * + * @param file Output file stream + * @throw IOException + */ + public final void dump(DataOutputStream file) throws IOException + { + super.dump(file); + file.writeShort(number_of_exceptions); + for(int i=0; i < number_of_exceptions; i++) + file.writeShort(exception_index_table[i]); + } + + /** + * @return Array of indices into constant pool of thrown exceptions. + */ + public final int[] getExceptionIndexTable() {return exception_index_table;} + /** + * @return Length of exception table. + */ + public final int getNumberOfExceptions() { return number_of_exceptions; } + + /** + * @return class names of thrown exceptions + */ + public final String[] getExceptionNames() { + String[] names = new String[number_of_exceptions]; + for(int i=0; i < number_of_exceptions; i++) + names[i] = constant_pool.getConstantString(exception_index_table[i], + Constants.CONSTANT_Class). + replace('/', '.'); + return names; + } + + /** + * @param exception_index_table. + * Also redefines number_of_exceptions according to table length. + */ + public final void setExceptionIndexTable(int[] exception_index_table) { + this.exception_index_table = exception_index_table; + number_of_exceptions = (exception_index_table == null)? 0 : + exception_index_table.length; + } + /** + * @return String representation, i.e., a list of thrown exceptions. + */ + public final String toString() { + StringBuffer buf = new StringBuffer(""); + String str; + + for(int i=0; i < number_of_exceptions; i++) { + str = constant_pool.getConstantString(exception_index_table[i], + Constants.CONSTANT_Class); + buf.append(Utility.compactClassName(str, false)); + + if(i < number_of_exceptions - 1) + buf.append(", "); + } + + return buf.toString(); + } + + /** + * @return deep copy of this attribute + */ + public Attribute copy(ConstantPool constant_pool) { + ExceptionTable c = (ExceptionTable)clone(); + c.exception_index_table = (int[])exception_index_table.clone(); + c.constant_pool = constant_pool; + return c; + } +} |