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package javax.sound.midi;

import java.util.Vector;
import com.sun.media.sound.MidiUtils;


A Sequence is a data structure containing musical
information (often an entire song or composition) that can be played
back by a Sequencer object. Specifically, the
Sequence contains timing
information and one or more tracks.  Each track consists of a
series of MIDI events (such as note-ons, note-offs, program changes, and meta-events).
The sequence's timing information specifies the type of unit that is used
to time-stamp the events in the sequence.

A Sequence can be created from a MIDI file by reading the file
into an input stream and invoking one of the getSequence methods of MidiSystem. A sequence can also be built from scratch by adding new Tracks to an empty Sequence, and adding
MidiEvent objects to these Tracks.
Author:
Kara Kytle
See Also:
Sequencer.setSequence(InputStream stream)
Sequencer.setSequence(Sequence sequence)
Track.add(MidiEvent)
MidiFileFormat/**
 * A <code>Sequence</code> is a data structure containing musical
 * information (often an entire song or composition) that can be played
 * back by a <code>{@link Sequencer}</code> object. Specifically, the
 * <code>Sequence</code> contains timing
 * information and one or more tracks.  Each <code>{@link Track track}</code> consists of a
 * series of MIDI events (such as note-ons, note-offs, program changes, and meta-events).
 * The sequence's timing information specifies the type of unit that is used
 * to time-stamp the events in the sequence.
 * <p>
 * A <code>Sequence</code> can be created from a MIDI file by reading the file
 * into an input stream and invoking one of the <code>getSequence</code> methods of
 * {@link MidiSystem}.  A sequence can also be built from scratch by adding new
 * <code>Tracks</code> to an empty <code>Sequence</code>, and adding
 * <code>{@link MidiEvent}</code> objects to these <code>Tracks</code>.
 *
 * @see Sequencer#setSequence(java.io.InputStream stream)
 * @see Sequencer#setSequence(Sequence sequence)
 * @see Track#add(MidiEvent)
 * @see MidiFileFormat
 *
 * @author Kara Kytle
 */
public class Sequence {


    // Timing types

    
The tempo-based timing type, for which the resolution is expressed in pulses (ticks) per quarter note.
See Also:
Sequence(float, int)/**
     * The tempo-based timing type, for which the resolution is expressed in pulses (ticks) per quarter note.
     * @see #Sequence(float, int)
     */
    public static final float PPQ                                                       = 0.0f;

    
The SMPTE-based timing type with 24 frames per second (resolution is expressed in ticks per frame).
See Also:
Sequence(float, int)/**
     * The SMPTE-based timing type with 24 frames per second (resolution is expressed in ticks per frame).
     * @see #Sequence(float, int)
     */
    public static final float SMPTE_24                                          = 24.0f;

    
The SMPTE-based timing type with 25 frames per second (resolution is expressed in ticks per frame).
See Also:
Sequence(float, int)/**
     * The SMPTE-based timing type with 25 frames per second (resolution is expressed in ticks per frame).
     * @see #Sequence(float, int)
     */
    public static final float SMPTE_25                                          = 25.0f;

    
The SMPTE-based timing type with 29.97 frames per second (resolution is expressed in ticks per frame).
See Also:
Sequence(float, int)/**
     * The SMPTE-based timing type with 29.97 frames per second (resolution is expressed in ticks per frame).
     * @see #Sequence(float, int)
     */
    public static final float SMPTE_30DROP                                      = 29.97f;

    
The SMPTE-based timing type with 30 frames per second (resolution is expressed in ticks per frame).
See Also:
Sequence(float, int)/**
     * The SMPTE-based timing type with 30 frames per second (resolution is expressed in ticks per frame).
     * @see #Sequence(float, int)
     */
    public static final float SMPTE_30                                          = 30.0f;


    // Variables

    
The timing division type of the sequence.
See Also:
PPQ
SMPTE_24
SMPTE_25
SMPTE_30DROP
SMPTE_30
getDivisionType/**
     * The timing division type of the sequence.
     * @see #PPQ
     * @see #SMPTE_24
     * @see #SMPTE_25
     * @see #SMPTE_30DROP
     * @see #SMPTE_30
     * @see #getDivisionType
     */
    protected float divisionType;

    
The timing resolution of the sequence.
See Also:
getResolution/**
     * The timing resolution of the sequence.
     * @see #getResolution
     */
    protected int resolution;

    
The MIDI tracks in this sequence.
See Also:
getTracks/**
     * The MIDI tracks in this sequence.
     * @see #getTracks
     */
    protected Vector<Track> tracks = new Vector<Track>();


    
Constructs a new MIDI sequence with the specified timing division
type and timing resolution.  The division type must be one of the
recognized MIDI timing types.  For tempo-based timing,
divisionType is PPQ (pulses per quarter note) and
the resolution is specified in ticks per beat.  For SMTPE timing,
divisionType specifies the number of frames per
second and the resolution is specified in ticks per frame.
The sequence will contain no initial tracks.  Tracks may be
added to or removed from the sequence using createTrack
and deleteTrack.
Params:
divisionType – the timing division type (PPQ or one of the SMPTE types)
resolution – the timing resolution
Throws:
InvalidMidiDataException – if divisionType is not valid
See Also:
PPQ
SMPTE_24
SMPTE_25
SMPTE_30DROP
SMPTE_30
getDivisionType
getResolution
getTracks/**
     * Constructs a new MIDI sequence with the specified timing division
     * type and timing resolution.  The division type must be one of the
     * recognized MIDI timing types.  For tempo-based timing,
     * <code>divisionType</code> is PPQ (pulses per quarter note) and
     * the resolution is specified in ticks per beat.  For SMTPE timing,
     * <code>divisionType</code> specifies the number of frames per
     * second and the resolution is specified in ticks per frame.
     * The sequence will contain no initial tracks.  Tracks may be
     * added to or removed from the sequence using <code>{@link #createTrack}</code>
     * and <code>{@link #deleteTrack}</code>.
     *
     * @param divisionType the timing division type (PPQ or one of the SMPTE types)
     * @param resolution the timing resolution
     * @throws InvalidMidiDataException if <code>divisionType</code> is not valid
     *
     * @see #PPQ
     * @see #SMPTE_24
     * @see #SMPTE_25
     * @see #SMPTE_30DROP
     * @see #SMPTE_30
     * @see #getDivisionType
     * @see #getResolution
     * @see #getTracks
     */
    public Sequence(float divisionType, int resolution) throws InvalidMidiDataException {

        if (divisionType == PPQ)
            this.divisionType = PPQ;
        else if (divisionType == SMPTE_24)
            this.divisionType = SMPTE_24;
        else if (divisionType == SMPTE_25)
            this.divisionType = SMPTE_25;
        else if (divisionType == SMPTE_30DROP)
            this.divisionType = SMPTE_30DROP;
        else if (divisionType == SMPTE_30)
            this.divisionType = SMPTE_30;
        else throw new InvalidMidiDataException("Unsupported division type: " + divisionType);

        this.resolution = resolution;
    }


    
Constructs a new MIDI sequence with the specified timing division
type, timing resolution, and number of tracks.  The division type must be one of the
recognized MIDI timing types.  For tempo-based timing,
divisionType is PPQ (pulses per quarter note) and
the resolution is specified in ticks per beat.  For SMTPE timing,
divisionType specifies the number of frames per
second and the resolution is specified in ticks per frame.
The sequence will be initialized with the number of tracks specified by
numTracks. These tracks are initially empty (i.e.
they contain only the meta-event End of Track).
The tracks may be retrieved for editing using the getTracks
method.  Additional tracks may be added, or existing tracks removed,
using createTrack and deleteTrack.
Params:
divisionType – the timing division type (PPQ or one of the SMPTE types)
resolution – the timing resolution
numTracks – the initial number of tracks in the sequence.
Throws:
InvalidMidiDataException – if divisionType is not valid
See Also:
PPQ
SMPTE_24
SMPTE_25
SMPTE_30DROP
SMPTE_30
getDivisionType
getResolution/**
     * Constructs a new MIDI sequence with the specified timing division
     * type, timing resolution, and number of tracks.  The division type must be one of the
     * recognized MIDI timing types.  For tempo-based timing,
     * <code>divisionType</code> is PPQ (pulses per quarter note) and
     * the resolution is specified in ticks per beat.  For SMTPE timing,
     * <code>divisionType</code> specifies the number of frames per
     * second and the resolution is specified in ticks per frame.
     * The sequence will be initialized with the number of tracks specified by
     * <code>numTracks</code>. These tracks are initially empty (i.e.
     * they contain only the meta-event End of Track).
     * The tracks may be retrieved for editing using the <code>{@link #getTracks}</code>
     * method.  Additional tracks may be added, or existing tracks removed,
     * using <code>{@link #createTrack}</code> and <code>{@link #deleteTrack}</code>.
     *
     * @param divisionType the timing division type (PPQ or one of the SMPTE types)
     * @param resolution the timing resolution
     * @param numTracks the initial number of tracks in the sequence.
     * @throws InvalidMidiDataException if <code>divisionType</code> is not valid
     *
     * @see #PPQ
     * @see #SMPTE_24
     * @see #SMPTE_25
     * @see #SMPTE_30DROP
     * @see #SMPTE_30
     * @see #getDivisionType
     * @see #getResolution
     */
    public Sequence(float divisionType, int resolution, int numTracks) throws InvalidMidiDataException {

        if (divisionType == PPQ)
            this.divisionType = PPQ;
        else if (divisionType == SMPTE_24)
            this.divisionType = SMPTE_24;
        else if (divisionType == SMPTE_25)
            this.divisionType = SMPTE_25;
        else if (divisionType == SMPTE_30DROP)
            this.divisionType = SMPTE_30DROP;
        else if (divisionType == SMPTE_30)
            this.divisionType = SMPTE_30;
        else throw new InvalidMidiDataException("Unsupported division type: " + divisionType);

        this.resolution = resolution;

        for (int i = 0; i < numTracks; i++) {
            tracks.addElement(new Track());
        }
    }


    
Obtains the timing division type for this sequence.
See Also:
PPQ
SMPTE_24
SMPTE_25
SMPTE_30DROP
SMPTE_30
Sequence(float, int)
MidiFileFormat.getDivisionType()
Returns:
the division type (PPQ or one of the SMPTE types)/**
     * Obtains the timing division type for this sequence.
     * @return the division type (PPQ or one of the SMPTE types)
     *
     * @see #PPQ
     * @see #SMPTE_24
     * @see #SMPTE_25
     * @see #SMPTE_30DROP
     * @see #SMPTE_30
     * @see #Sequence(float, int)
     * @see MidiFileFormat#getDivisionType()
     */
    public float getDivisionType() {
        return divisionType;
    }


    
Obtains the timing resolution for this sequence.
If the sequence's division type is PPQ, the resolution is specified in ticks per beat.
For SMTPE timing, the resolution is specified in ticks per frame.
See Also:
getDivisionType
Sequence(float, int)
MidiFileFormat.getResolution()
Returns:
the number of ticks per beat (PPQ) or per frame (SMPTE)/**
     * Obtains the timing resolution for this sequence.
     * If the sequence's division type is PPQ, the resolution is specified in ticks per beat.
     * For SMTPE timing, the resolution is specified in ticks per frame.
     *
     * @return the number of ticks per beat (PPQ) or per frame (SMPTE)
     * @see #getDivisionType
     * @see #Sequence(float, int)
     * @see MidiFileFormat#getResolution()
     */
    public int getResolution() {
        return resolution;
    }


    
Creates a new, initially empty track as part of this sequence.
The track initially contains the meta-event End of Track.
The newly created track is returned.  All tracks in the sequence
may be retrieved using getTracks.  Tracks may be
removed from the sequence using deleteTrack.
Returns:
the newly created track/**
     * Creates a new, initially empty track as part of this sequence.
     * The track initially contains the meta-event End of Track.
     * The newly created track is returned.  All tracks in the sequence
     * may be retrieved using <code>{@link #getTracks}</code>.  Tracks may be
     * removed from the sequence using <code>{@link #deleteTrack}</code>.
     * @return the newly created track
     */
    public Track createTrack() {

        Track track = new Track();
        tracks.addElement(track);

        return track;
    }


    
Removes the specified track from the sequence.
Params:
track – the track to remove
See Also:
createTrack
getTracks
Returns:
true if the track existed in the track and was removed,
otherwise false./**
     * Removes the specified track from the sequence.
     * @param track the track to remove
     * @return <code>true</code> if the track existed in the track and was removed,
     * otherwise <code>false</code>.
     *
     * @see #createTrack
     * @see #getTracks
     */
    public boolean deleteTrack(Track track) {
        return tracks.removeElement(track);
    }


    
Obtains an array containing all the tracks in this sequence.
If the sequence contains no tracks, an array of length 0 is returned.
See Also:
createTrack
deleteTrack
Returns:
the array of tracks/**
     * Obtains an array containing all the tracks in this sequence.
     * If the sequence contains no tracks, an array of length 0 is returned.
     * @return the array of tracks
     *
     * @see #createTrack
     * @see #deleteTrack
     */
    public Track[] getTracks() {
        // Creation of the non-empty array will be synchronized inside toArray()
        return tracks.toArray(new Track[0]);
    }


    
Obtains the duration of this sequence, expressed in microseconds.
Returns:
this sequence's duration in microseconds./**
     * Obtains the duration of this sequence, expressed in microseconds.
     * @return this sequence's duration in microseconds.
     */
    public long getMicrosecondLength() {

        return com.sun.media.sound.MidiUtils.tick2microsecond(this, getTickLength(), null);
    }


    
Obtains the duration of this sequence, expressed in MIDI ticks.
See Also:
getMicrosecondLength
Returns:
this sequence's length in ticks/**
     * Obtains the duration of this sequence, expressed in MIDI ticks.
     *
     * @return this sequence's length in ticks
     *
     * @see #getMicrosecondLength
     */
    public long getTickLength() {

        long length = 0;

        synchronized(tracks) {

            for(int i=0; i<tracks.size(); i++ ) {
                long temp = ((Track)tracks.elementAt(i)).ticks();
                if( temp>length ) {
                    length = temp;
                }
            }
            return length;
        }
    }


    
Obtains a list of patches referenced in this sequence.
This patch list may be used to load the required
Instrument objects
into a Synthesizer.
See Also:
Synthesizer.loadInstruments(Soundbank, Patch[])
Returns:
an array of Patch objects used in this sequence/**
     * Obtains a list of patches referenced in this sequence.
     * This patch list may be used to load the required
     * <code>{@link Instrument}</code> objects
     * into a <code>{@link Synthesizer}</code>.
     *
     * @return an array of <code>{@link Patch}</code> objects used in this sequence
     *
     * @see Synthesizer#loadInstruments(Soundbank, Patch[])
     */
    public Patch[] getPatchList() {

        // $$kk: 04.09.99: need to implement!!
        return new Patch[0];
    }
}