/*
 * Copyright  2000-2004 The Apache Software Foundation
 *
 *  Licensed 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 org.apache.bcel.generic;

import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.util.ByteSequence;

/**
 * JSR_W - Jump to subroutine
 * 
 * @version $Id: JSR_W.java 386056 2006-03-15 11:31:56Z tcurdt $
 * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
 */
public class JSR_W extends JsrInstruction {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * Empty constructor needed for the Class.newInstance() statement in
	 * Instruction.readInstruction(). Not to be used otherwise.
	 */
	JSR_W() {
	}

	public JSR_W(InstructionHandle target) {
		super(org.apache.bcel.Constants.JSR_W, target);
		length = 5;
	}

	/**
	 * Dump instruction as byte code to stream out.
	 * 
	 * @param out
	 *            Output stream
	 */
	@Override
	public void dump(DataOutputStream out) throws IOException {
		index = getTargetOffset();
		out.writeByte(opcode);
		out.writeInt(index);
	}

	/**
	 * Read needed data (e.g. index) from file.
	 */
	@Override
	protected void initFromFile(ByteSequence bytes, boolean wide)
			throws IOException {
		index = bytes.readInt();
		length = 5;
	}

	/**
	 * 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
	 */
	@Override
	public void accept(Visitor v) {
		v.visitStackProducer(this);
		v.visitBranchInstruction(this);
		v.visitJsrInstruction(this);
		v.visitJSR_W(this);
	}
}
