package org.apache.bcel.generic;

/* ====================================================================
 * 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 java.io.*;
import org.apache.bcel.util.ByteSequence;

/**
 * LOOKUPSWITCH - Switch with unordered set of values
 * 
 * @version $Id: LOOKUPSWITCH.java,v 1.4 2006/08/23 13:48:30 andos Exp $
 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>. Modified by Ando
 *         Saabas
 * @see SWITCH
 */
public class LOOKUPSWITCH extends Select {
	/**
	 * 
	 */
	private static final long serialVersionUID = -5182745845131218825L;

	/**
	 * Empty constructor needed for the Class.newInstance() statement in
	 * Instruction.readInstruction(). Not to be used otherwise.
	 */
	public LOOKUPSWITCH() {
		super(org.apache.bcel.Constants.LOOKUPSWITCH);
	}

	public LOOKUPSWITCH(int[] match, InstructionHandle[] targets,
			InstructionHandle target) {
		super(org.apache.bcel.Constants.LOOKUPSWITCH, match, targets, target);

		length = (short) (9 + match_length * 8); /*
													 * alignment remainder
													 * assumed 0 here, until
													 * dump time.
													 */
		fixed_length = length;
	}

	/**
	 * Dump instruction as byte code to stream out.
	 * 
	 * @param out
	 *            Output stream
	 */
	public void dump(DataOutputStream out) throws IOException {
		super.dump(out);
		out.writeInt(match_length); // npairs

		for (int i = 0; i < match_length; i++) {
			out.writeInt(match[i]); // match-offset pairs
			out.writeInt(indices[i] = getTargetOffset(targets[i]));
		}
	}

	/**
	 * Read needed data (e.g. index) from file.
	 */
	protected void initFromFile(ByteSequence bytes, boolean wide)
			throws IOException {
		super.initFromFile(bytes, wide); // reads padding

		match_length = bytes.readInt();
		fixed_length = (short) (9 + match_length * 8);
		length = (short) (fixed_length + padding);

		match = new int[match_length];
		indices = new int[match_length];
		targets = new InstructionHandle[match_length];

		for (int i = 0; i < match_length; i++) {
			match[i] = bytes.readInt();
			indices[i] = bytes.readInt();
		}
	}

	/**
	 * Call corresponding visitor method(s). The order is: Call visitor methods
	 * of implemented interfaces first, then call methods according to the class
	 * hierarchy in descending order, i.e., the most specific visitXXX() call
	 * comes last.
	 * 
	 * @param v
	 *            Visitor object
	 */
	public void accept(Visitor v) {
		v.visitVariableLengthInstruction(this);
		v.visitStackProducer(this);
		v.visitBranchInstruction(this);
		v.visitSelect(this);
		v.visitLOOKUPSWITCH(this);
	}

	public void setMatchesTargets(int[] match, InstructionHandle[] targets) {
		super.setMatchesTargets(match, targets);
		length = (short) (9 + match_length * 8); /*
													 * alignment remainder
													 * assumed 0 here, until
													 * dump time.
													 */
		fixed_length = length;
	}

}
