    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 * LOOKUPSWITCH - Switch with unordered set of values
    027 *
    028 * @see SWITCH
    029 */
    030public class LOOKUPSWITCH extends Select {
    031
    032    /**
    033     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    034     */
    035    LOOKUPSWITCH() {
    036    }
    037
    038    public LOOKUPSWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle defaultTarget) {
    039        super(org.apache.bcel.Const.LOOKUPSWITCH, match, targets, defaultTarget);
    040        /* alignment remainder assumed 0 here, until dump time. */
    041        final short length = (short) (9 + getMatch_length() * 8);
    042        super.setLength(length);
    043        setFixed_length(length);
    044    }
    045
    046    /**
    047     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    048     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
    049     *
    050     * @param v Visitor object
    051     */
    052    @Override
    053    public void accept(final Visitor v) {
    054        v.visitVariableLengthInstruction(this);
    055        v.visitStackConsumer(this);
    056        v.visitBranchInstruction(this);
    057        v.visitSelect(this);
    058        v.visitLOOKUPSWITCH(this);
    059    }
    060
    061    /**
    062     * Dump instruction as byte code to stream out.
    063     *
    064     * @param out Output stream
    065     */
    066    @Override
    067    public void dump(final DataOutputStream out) throws IOException {
    068        super.dump(out);
    069        final int matchLength = getMatch_length();
    070        out.writeInt(matchLength); // npairs
    071        for (int i = 0; i < matchLength; i++) {
    072            out.writeInt(super.getMatch(i)); // match-offset pairs
    073            out.writeInt(setIndices(i, getTargetOffset(super.getTarget(i))));
    074        }
    075    }
    076
    077    /**
    078     * Read needed data (e.g. index) from file.
    079     */
    080    @Override
    081    protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
    082        super.initFromFile(bytes, wide); // reads padding
    083        final int matchLength = bytes.readInt();
    084        setMatch_length(matchLength);
    085        final short fixedLength = (short) (9 + matchLength * 8);
    086        setFixed_length(fixedLength);
    087        final short length = (short) (matchLength + super.getPadding());
    088        super.setLength(length);
    089        super.setMatches(new int[matchLength]);
    090        super.setIndices(new int[matchLength]);
    091        super.setTargets(new InstructionHandle[matchLength]);
    092        for (int i = 0; i < matchLength; i++) {
    093            super.setMatch(i, bytes.readInt());
    094            super.setIndices(i, bytes.readInt());
    095        }
    096    }
    097}