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 */
017package org.apache.bcel.generic;
018
019import java.io.DataOutputStream;
020import java.io.IOException;
021
022import org.apache.bcel.util.ByteSequence;
023
024/**
025 * GOTO_W - Branch always (to relative offset, not absolute address)
026 */
027public class GOTO_W extends GotoInstruction {
028
029    /**
030     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
031     */
032    GOTO_W() {
033    }
034
035    public GOTO_W(final InstructionHandle target) {
036        super(org.apache.bcel.Const.GOTO_W, target);
037        super.setLength(5);
038    }
039
040    /**
041     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
042     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
043     *
044     * @param v Visitor object
045     */
046    @Override
047    public void accept(final Visitor v) {
048        v.visitUnconditionalBranch(this);
049        v.visitBranchInstruction(this);
050        v.visitGotoInstruction(this);
051        v.visitGOTO_W(this);
052    }
053
054    /**
055     * Dump instruction as byte code to stream out.
056     *
057     * @param out Output stream
058     */
059    @Override
060    public void dump(final DataOutputStream out) throws IOException {
061        super.setIndex(getTargetOffset());
062        out.writeByte(super.getOpcode());
063        out.writeInt(super.getIndex());
064    }
065
066    /**
067     * Read needed data (e.g. index) from file.
068     */
069    @Override
070    protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
071        super.setIndex(bytes.readInt());
072        super.setLength(5);
073    }
074}