/*

 * Copyright (c) 2002, 2007, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.media.sound;

import javax.sound.midi.*;

/**

 * an optimized ShortMessage that does not need an array

 *

 * @author Florian Bomers

 */

class FastShortMessage extends ShortMessage {

    private int packedMsg;

    public FastShortMessage(int packedMsg) throws InvalidMidiDataException {

        this.packedMsg = packedMsg;

        getDataLength(packedMsg & 0xFF); // to check for validity

    }

    /** Creates a FastShortMessage from this ShortMessage */

    public FastShortMessage(ShortMessage msg) {

        this.packedMsg = msg.getStatus()

            | (msg.getData1() << 8)

            | (msg.getData2() << 16);

    }

    int getPackedMsg() {

        return packedMsg;

    }

    public byte[] getMessage() {

        int length = 0;

        try {

            // fix for bug 4851018: MidiMessage.getLength and .getData return wrong values

            // fix for bug 4890405: Reading MidiMessage byte array fails in 1.4.2

            length = getDataLength(packedMsg & 0xFF) + 1;

        } catch (InvalidMidiDataException imde) {

            // should never happen

        }

        byte[] returnedArray = new byte[length];

        if (length>0) {

            returnedArray[0] = (byte) (packedMsg & 0xFF);

            if (length>1) {

                returnedArray[1] = (byte) ((packedMsg & 0xFF00) >> 8);

                if (length>2) {

                    returnedArray[2] = (byte) ((packedMsg & 0xFF0000) >> 16);

                }

            }

        }

        return returnedArray;

    }

    public int getLength() {

        try {

            return getDataLength(packedMsg & 0xFF) + 1;

        } catch (InvalidMidiDataException imde) {

            // should never happen

        }

        return 0;

    }

    public void setMessage(int status) throws InvalidMidiDataException {

        // check for valid values

        int dataLength = getDataLength(status); // can throw InvalidMidiDataException

        if (dataLength != 0) {

            super.setMessage(status); // throws Exception

        }

        packedMsg = (packedMsg & 0xFFFF00) | (status & 0xFF);

    }

    public void setMessage(int status, int data1, int data2) throws InvalidMidiDataException {

        getDataLength(status); // can throw InvalidMidiDataException

        packedMsg = (status & 0xFF) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16);

    }

    public void setMessage(int command, int channel, int data1, int data2) throws InvalidMidiDataException {

        getDataLength(command); // can throw InvalidMidiDataException

        packedMsg = (command & 0xF0) | (channel & 0x0F) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16);

    }

    public int getChannel() {

        return packedMsg & 0x0F;

    }

    public int getCommand() {

        return packedMsg & 0xF0;

    }

    public int getData1() {

        return (packedMsg & 0xFF00) >> 8;

    }

    public int getData2() {

        return (packedMsg & 0xFF0000) >> 16;

    }

    public int getStatus() {

        return packedMsg & 0xFF;

    }

    /**

     * Creates a new object of the same class and with the same contents

     * as this object.

     * @return a clone of this instance.

     */

    public Object clone() {

        try {

            return new FastShortMessage(packedMsg);

        } catch (InvalidMidiDataException imde) {

            // should never happen

        }

        return null;

    }

} // class FastShortMsg