/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You 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 com.sun.org.apache.bcel.internal.generic;

import java.io.DataOutputStream;

import java.io.IOException;

import com.sun.org.apache.bcel.internal.util.ByteSequence;

/**

 * TABLESWITCH - Switch within given range of values, i.e., low..high

 *

 * @see SWITCH

 */

public class TABLESWITCH extends Select {

    /**

     * Empty constructor needed for Instruction.readInstruction.

     * Not to be used otherwise.

     */

    TABLESWITCH() {

    }

    /**

     * @param match sorted array of match values, match[0] must be low value,

     * match[match_length - 1] high value

     * @param targets where to branch for matched values

     * @param defaultTarget default branch

     */

    public TABLESWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle defaultTarget) {

        super(com.sun.org.apache.bcel.internal.Const.TABLESWITCH, match, targets, defaultTarget);

        /* Alignment remainder assumed 0 here, until dump time */

        final short _length = (short) (13 + getMatch_length() * 4);

        super.setLength(_length);

        setFixed_length(_length);

    }

    /**

     * Dump instruction as byte code to stream out.

     * @param out Output stream

     */

    @Override

    public void dump( final DataOutputStream out ) throws IOException {

        super.dump(out);

        final int _match_length = getMatch_length();

        final int low = (_match_length > 0) ? super.getMatch(0) : 0;

        out.writeInt(low);

        final int high = (_match_length > 0) ? super.getMatch(_match_length - 1) : 0;

        out.writeInt(high);

        for (int i = 0; i < _match_length; i++) {

            out.writeInt(setIndices(i, getTargetOffset(super.getTarget(i))));

        }

    }

    /**

     * Read needed data (e.g. index) from file.

     */

    @Override

    protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {

        super.initFromFile(bytes, wide);

        final int low = bytes.readInt();

        final int high = bytes.readInt();

        final int _match_length = high - low + 1;

        setMatch_length(_match_length);

        final short _fixed_length = (short) (13 + _match_length * 4);

        setFixed_length(_fixed_length);

        super.setLength((short) (_fixed_length + super.getPadding()));

        super.setMatches(new int[_match_length]);

        super.setIndices(new int[_match_length]);

        super.setTargets(new InstructionHandle[_match_length]);

        for (int i = 0; i < _match_length; i++) {

            super.setMatch(i, low + i);

            super.setIndices(i, bytes.readInt());

        }

    }

    /**

     * 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( final Visitor v ) {

        v.visitVariableLengthInstruction(this);

        v.visitStackConsumer(this);

        v.visitBranchInstruction(this);

        v.visitSelect(this);

        v.visitTABLESWITCH(this);

    }

}