/*
 * @(#)MetaMessage.java	1.25 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.sound.midi;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;


/**
 * A <code>MetaMessage</code> is a <code>{@link MidiMessage}</code> that is not meaningful to synthesizers, but

 * that can be stored in a MIDI file and interpreted by a sequencer program.
 * (See the discussion in the <code>MidiMessage</code>
 * class description.)  The Standard MIDI Files specification defines
 * various types of meta-events, such as sequence number, lyric, cue point,
 * and set tempo.  There are also meta-events
 * for such information as lyrics, copyrights, tempo indications, time and key
 * signatures, markers, etc.  For more information, see the Standard MIDI Files 1.0
 * specification, which is part of the Complete MIDI 1.0 Detailed Specification
 * published by the MIDI Manufacturer's Association
 * (<a href = http://www.midi.org>http://www.midi.org</a>).
 *
 * <p>
 * When data is being transported using MIDI wire protocol,
 * a <code>{@link ShortMessage}</code> with the status value <code>0xFF</code> represents
 * a system reset message.  In MIDI files, this same status value denotes a <code>MetaMessage</code>.
 * The types of meta-message are distinguished from each other by the first byte
 * that follows the status byte <code>0xFF</code>.  The subsequent bytes are data
 * bytes.  As with system exclusive messages, there are an arbitrary number of
 * data bytes, depending on the type of <code>MetaMessage</code>.
 *
 * @see MetaEventListener
 *
 * @version 1.25, 05/11/17
 * @author David Rivas
 * @author Kara Kytle
 */

public class MetaMessage extends MidiMessage {


    // Status byte defines

    /**
     * Status byte for <code>MetaMessage</code> (0xFF, or 255), which is used
     * in MIDI files.  It has the same value as SYSTEM_RESET, which
     * is used in the real-time "MIDI wire" protocol.
     * @see MidiMessage#getStatus
     */
    public static final int META						= 0xFF; // 255


    // Default meta message data: just the META status byte value
    // $$kk: 09.09.99: need a real event here!!

    private static byte[] defaultMessage				= { (byte)META, 0 };



    // Instance variables

    /**
     * The length of the actual message in the data array.
     * This is used to determine how many bytes of the data array
     * is the message, and how many are the status byte, the
     * type byte, and the variable-length-int describing the
     * length of the message.
     */
    private int dataLength = 0;


    /**
     * Constructs a new <code>MetaMessage</code>. The contents of
     * the message are not set here; use
     * {@link #setMessage(int, byte[], int) setMessage}
     * to set them subsequently.
     */
    public MetaMessage() {
	//super(defaultMessage);
	this(defaultMessage);
    }


    /**
     * Constructs a new <code>MetaMessage</code>.
     * @param data an array of bytes containing the complete message.
     * The message data may be changed using the <code>setMessage</code>
     * method.
     * @see #setMessage
     */
    protected MetaMessage(byte[] data) {
	super(data);
	//$$fb 2001-10-06: need to calculate dataLength. Fix for bug #4511796
	if (data.length>=3) {
	    dataLength=data.length-3;