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+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;
+ }
+}