FastSysexMessage.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
 *
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package com.sun.media.sound;

import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.SysexMessage;

/**
 * optimized FastSysexMessage that doesn't copy the array upon instantiation.
 *
 * @author Florian Bomers
 */
final class FastSysexMessage extends SysexMessage {

    FastSysexMessage(byte[] data) throws InvalidMidiDataException {
        super(data);
        MidiUtils.checkSysexStatus(data, data.length);
    }

    /**
     * The returned array may be larger than this message is.
     * Use getLength() to get the real length of the message.
     */
    byte[] getReadOnlyMessage() {
        return data;
    }

    // overwrite this method so that the original data array,
    // which is shared among all transmitters, cannot be modified
    @Override
    public void setMessage(byte[] data, int length) throws InvalidMidiDataException {
        MidiUtils.checkSysexStatus(data, length);
        this.length = length;
        this.data = new byte[this.length];
        System.arraycopy(data, 0, this.data, 0, length);
    }

} // class FastSysexMessage