/*

 * Copyright 1999-2004 Sun Microsystems, Inc.  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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package javax.sound.midi;

import java.util.Vector;

import com.sun.media.sound.MidiUtils;

/**

 * 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 #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 #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 #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 #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 #Sequence(float, int)

     */

    public static final float SMPTE_30                                          = 30.0f;

    // Variables

    /**

     * 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 #getResolution

     */

    protected int resolution;

    /**

     * 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,

     * <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,

     * <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.

     * @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.

     *

     * @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 <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.

     * @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) {

        synchronized(tracks) {

            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.

     * @return the array of tracks

     *

     * @see #createTrack

     * @see #deleteTrack

     */

    public Track[] getTracks() {

        return (Track[]) tracks.toArray(new Track[tracks.size()]);

    }

    /**

     * 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.

     *

     * @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

     * <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];

    }

}