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	/*
	* reserved comment block
	* DO NOT REMOVE OR ALTER!
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.sun.org.apache.bcel.internal.classfile;

	import java.io.DataInput;
	import java.io.DataOutputStream;
	import java.io.IOException;

	import com.sun.org.apache.bcel.internal.Const;

	/**
	* 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).
	*
	* @see Code
	*/
	public final class ExceptionTable extends Attribute {

	private int[] exceptionIndexTable; // constant pool


	/**
	* Initialize from another object. Note that both objects use the same
	* references (shallow copy). Use copy() for a physical copy.
	*/
	public ExceptionTable(final 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 exceptionIndexTable Table of indices in constant pool
	* @param constant_pool Array of constants
	*/
	public ExceptionTable(final int name_index, final int length, final int[] exceptionIndexTable,
	final ConstantPool constant_pool) {
	super(Const.ATTR_EXCEPTIONS, name_index, length, constant_pool);
	this.exceptionIndexTable = exceptionIndexTable != null ? exceptionIndexTable : new int[0];
	}


	/**
	* Construct object from input stream.
	* @param nameIndex Index in constant pool
	* @param length Content length in bytes
	* @param input Input stream
	* @param constantPool Array of constants
	* @throws IOException
	*/
	ExceptionTable(final int nameIndex, final int length, final DataInput input, final ConstantPool constantPool) throws IOException {
	this(nameIndex, length, (int[]) null, constantPool);
	final int number_of_exceptions = input.readUnsignedShort();
	exceptionIndexTable = new int[number_of_exceptions];
	for (int i = 0; i < number_of_exceptions; i++) {
	exceptionIndexTable[i] = input.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
	*/
	@Override
	public void accept( final Visitor v ) {
	v.visitExceptionTable(this);
	}


	/**
	* Dump exceptions attribute to file stream in binary format.
	*
	* @param file Output file stream
	* @throws IOException
	*/
	@Override
	public void dump( final DataOutputStream file ) throws IOException {
	super.dump(file);
	file.writeShort(exceptionIndexTable.length);
	for (final int index : exceptionIndexTable) {
	file.writeShort(index);
	}
	}


	/**
	* @return Array of indices into constant pool of thrown exceptions.
	*/
	public int[] getExceptionIndexTable() {
	return exceptionIndexTable;
	}


	/**
	* @return Length of exception table.
	*/
	public int getNumberOfExceptions() {
	return exceptionIndexTable == null ? 0 : exceptionIndexTable.length;
	}


	/**
	* @return class names of thrown exceptions
	*/
	public String[] getExceptionNames() {
	final String[] names = new String[exceptionIndexTable.length];
	for (int i = 0; i < exceptionIndexTable.length; i++) {
	names[i] = super.getConstantPool().getConstantString(exceptionIndexTable[i],
	Const.CONSTANT_Class).replace('/', '.');
	}
	return names;
	}


	/**
	* @param exceptionIndexTable the list of exception indexes
	* Also redefines number_of_exceptions according to table length.
	*/
	public void setExceptionIndexTable( final int[] exceptionIndexTable ) {
	this.exceptionIndexTable = exceptionIndexTable != null ? exceptionIndexTable : new int[0];
	}


	/**
	* @return String representation, i.e., a list of thrown exceptions.
	*/
	@Override
	public String toString() {
	final StringBuilder buf = new StringBuilder();
	String str;
	buf.append("Exceptions: ");
	for (int i = 0; i < exceptionIndexTable.length; i++) {
	str = super.getConstantPool().getConstantString(exceptionIndexTable[i], Const.CONSTANT_Class);
	buf.append(Utility.compactClassName(str, false));
	if (i < exceptionIndexTable.length - 1) {
	buf.append(", ");
	}
	}
	return buf.toString();
	}


	/**
	* @return deep copy of this attribute
	*/
	@Override
	public Attribute copy( final ConstantPool _constant_pool ) {
	final ExceptionTable c = (ExceptionTable) clone();
	if (exceptionIndexTable != null) {
	c.exceptionIndexTable = new int[exceptionIndexTable.length];
	System.arraycopy(exceptionIndexTable, 0, c.exceptionIndexTable, 0,
	exceptionIndexTable.length);
	}
	c.setConstantPool(_constant_pool);
	return c;
	}
	}

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