    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 *
    017 */
    018package org.apache.bcel.generic;
    019
    020import java.io.DataOutputStream;
    021import java.io.IOException;
    022
    023import org.apache.bcel.util.ByteSequence;
    024
    025/**
    026 * JSR_W - Jump to subroutine
    027 *
    028 */
    029public class JSR_W extends JsrInstruction {
    030
    031    /**
    032     * Empty constructor needed for Instruction.readInstruction.
    033     * Not to be used otherwise.
    034     */
    035    JSR_W() {
    036    }
    037
    038
    039    public JSR_W(final InstructionHandle target) {
    040        super(org.apache.bcel.Const.JSR_W, target);
    041        super.setLength(5);
    042    }
    043
    044
    045    /**
    046     * Dump instruction as byte code to stream out.
    047     * @param out Output stream
    048     */
    049    @Override
    050    public void dump( final DataOutputStream out ) throws IOException {
    051        super.setIndex(getTargetOffset());
    052        out.writeByte(super.getOpcode());
    053        out.writeInt(super.getIndex());
    054    }
    055
    056
    057    /**
    058     * Read needed data (e.g. index) from file.
    059     */
    060    @Override
    061    protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
    062        super.setIndex(bytes.readInt());
    063        super.setLength(5);
    064    }
    065
    066
    067    /**
    068     * Call corresponding visitor method(s). The order is:
    069     * Call visitor methods of implemented interfaces first, then
    070     * call methods according to the class hierarchy in descending order,
    071     * i.e., the most specific visitXXX() call comes last.
    072     *
    073     * @param v Visitor object
    074     */
    075    @Override
    076    public void accept( final Visitor v ) {
    077        v.visitStackProducer(this);
    078        v.visitBranchInstruction(this);
    079        v.visitJsrInstruction(this);
    080        v.visitJSR_W(this);
    081    }
    082}