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 * 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.

 *

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package com.sun.media.sound;

import java.util.Arrays;

/**

 * A standard indexed director who chooses performers

 * by there keyfrom,keyto,velfrom,velto properties.

 *

 * @author Karl Helgason

 */

public final class ModelStandardIndexedDirector implements ModelDirector {

    private final ModelPerformer[] performers;

    private final ModelDirectedPlayer player;

    private boolean noteOnUsed = false;

    private boolean noteOffUsed = false;

    // Variables needed for index

    private byte[][] trantables;

    private int[] counters;

    private int[][] mat;

    public ModelStandardIndexedDirector(final ModelPerformer[] performers,

                                        final ModelDirectedPlayer player) {

        this.performers = Arrays.copyOf(performers, performers.length);

        this.player = player;

        for (final ModelPerformer p : this.performers) {

            if (p.isReleaseTriggered()) {

                noteOffUsed = true;

            } else {

                noteOnUsed = true;

            }

        }

        buildindex();

    }

    private int[] lookupIndex(int x, int y) {

        if ((x >= 0) && (x < 128) && (y >= 0) && (y < 128)) {

            int xt = trantables[0][x];

            int yt = trantables[1][y];

            if (xt != -1 && yt != -1) {

                return mat[xt + yt * counters[0]];

            }

        }

        return null;

    }

    private int restrict(int value) {

        if(value < 0) return 0;

        if(value > 127) return 127;

        return value;

    }

    private void buildindex() {

        trantables = new byte[2][129];

        counters = new int[trantables.length];

        for (ModelPerformer performer : performers) {

            int keyFrom = performer.getKeyFrom();

            int keyTo = performer.getKeyTo();

            int velFrom = performer.getVelFrom();

            int velTo = performer.getVelTo();

            if (keyFrom > keyTo) continue;

            if (velFrom > velTo) continue;

            keyFrom = restrict(keyFrom);

            keyTo = restrict(keyTo);

            velFrom = restrict(velFrom);

            velTo = restrict(velTo);

            trantables[0][keyFrom] = 1;

            trantables[0][keyTo + 1] = 1;

            trantables[1][velFrom] = 1;

            trantables[1][velTo + 1] = 1;

        }

        for (int d = 0; d < trantables.length; d++) {

            byte[] trantable = trantables[d];

            int transize = trantable.length;

            for (int i = transize - 1; i >= 0; i--) {

                if (trantable[i] == 1) {

                    trantable[i] = -1;

                    break;

                }

                trantable[i] = -1;

            }

            int counter = -1;

            for (int i = 0; i < transize; i++) {

                if (trantable[i] != 0) {

                    counter++;

                    if (trantable[i] == -1)

                        break;

                }

                trantable[i] = (byte) counter;

            }

            counters[d] = counter;

        }

        mat = new int[counters[0] * counters[1]][];

        int ix = 0;

        for (ModelPerformer performer : performers) {

            int keyFrom = performer.getKeyFrom();

            int keyTo = performer.getKeyTo();

            int velFrom = performer.getVelFrom();

            int velTo = performer.getVelTo();

            if (keyFrom > keyTo) continue;

            if (velFrom > velTo) continue;

            keyFrom = restrict(keyFrom);

            keyTo = restrict(keyTo);

            velFrom = restrict(velFrom);

            velTo = restrict(velTo);

            int x_from = trantables[0][keyFrom];

            int x_to = trantables[0][keyTo + 1];

            int y_from = trantables[1][velFrom];

            int y_to = trantables[1][velTo + 1];

            if (x_to == -1)

                x_to = counters[0];

            if (y_to == -1)

                y_to = counters[1];

            for (int y = y_from; y < y_to; y++) {

                int i = x_from + y * counters[0];

                for (int x = x_from; x < x_to; x++) {

                    int[] mprev = mat[i];

                    if (mprev == null) {

                        mat[i] = new int[] { ix };

                    } else {

                        int[] mnew = new int[mprev.length + 1];

                        mnew[mnew.length - 1] = ix;

                        for (int k = 0; k < mprev.length; k++)

                            mnew[k] = mprev[k];

                        mat[i] = mnew;

                    }

                    i++;

                }

            }

            ix++;

        }

    }

    public void close() {

    }

    public void noteOff(int noteNumber, int velocity) {

        if (!noteOffUsed)

            return;

        int[] plist = lookupIndex(noteNumber, velocity);

        if(plist == null) return;

        for (int i : plist) {

            ModelPerformer p = performers[i];

            if (p.isReleaseTriggered()) {

                player.play(i, null);

            }

        }

    }

    public void noteOn(int noteNumber, int velocity) {

        if (!noteOnUsed)

            return;

        int[] plist = lookupIndex(noteNumber, velocity);

        if(plist == null) return;

        for (int i : plist) {

            ModelPerformer p = performers[i];

            if (!p.isReleaseTriggered()) {

                player.play(i, null);

            }

        }

    }

}