    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 * TABLESWITCH - Switch within given range of values, i.e., low..high
    027 *
    028 * @version $Id$
    029 * @see SWITCH
    030 */
    031public class TABLESWITCH extends Select {
    032
    033    /**
    034     * Empty constructor needed for Instruction.readInstruction.
    035     * Not to be used otherwise.
    036     */
    037    TABLESWITCH() {
    038    }
    039
    040
    041    /**
    042     * @param match sorted array of match values, match[0] must be low value,
    043     * match[match_length - 1] high value
    044     * @param targets where to branch for matched values
    045     * @param defaultTarget default branch
    046     */
    047    public TABLESWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle defaultTarget) {
    048        super(org.apache.bcel.Const.TABLESWITCH, match, targets, defaultTarget);
    049        /* Alignment remainder assumed 0 here, until dump time */
    050        final short _length = (short) (13 + getMatch_length() * 4);
    051        super.setLength(_length);
    052        setFixed_length(_length);
    053    }
    054
    055
    056    /**
    057     * Dump instruction as byte code to stream out.
    058     * @param out Output stream
    059     */
    060    @Override
    061    public void dump( final DataOutputStream out ) throws IOException {
    062        super.dump(out);
    063        final int _match_length = getMatch_length();
    064        final int low = (_match_length > 0) ? super.getMatch(0) : 0;
    065        out.writeInt(low);
    066        final int high = (_match_length > 0) ? super.getMatch(_match_length - 1) : 0;
    067        out.writeInt(high);
    068        for (int i = 0; i < _match_length; i++) {
    069            out.writeInt(setIndices(i, getTargetOffset(super.getTarget(i))));
    070        }
    071    }
    072
    073
    074    /**
    075     * Read needed data (e.g. index) from file.
    076     */
    077    @Override
    078    protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
    079        super.initFromFile(bytes, wide);
    080        final int low = bytes.readInt();
    081        final int high = bytes.readInt();
    082        final int _match_length = high - low + 1;
    083        setMatch_length(_match_length);
    084        final short _fixed_length = (short) (13 + _match_length * 4);
    085        setFixed_length(_fixed_length);
    086        super.setLength((short) (_fixed_length + super.getPadding()));
    087        super.setMatches(new int[_match_length]);
    088        super.setIndices(new int[_match_length]);
    089        super.setTargets(new InstructionHandle[_match_length]);
    090        for (int i = 0; i < _match_length; i++) {
    091            super.setMatch(i, low + i);
    092            super.setIndices(i, bytes.readInt());
    093        }
    094    }
    095
    096
    097    /**
    098     * Call corresponding visitor method(s). The order is:
    099     * Call visitor methods of implemented interfaces first, then
    100     * call methods according to the class hierarchy in descending order,
    101     * i.e., the most specific visitXXX() call comes last.
    102     *
    103     * @param v Visitor object
    104     */
    105    @Override
    106    public void accept( final Visitor v ) {
    107        v.visitVariableLengthInstruction(this);
    108        v.visitStackConsumer(this);
    109        v.visitBranchInstruction(this);
    110        v.visitSelect(this);
    111        v.visitTABLESWITCH(this);
    112    }
    113}