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/*



Copyright (C) 2000 Andrew Sorensen & Andrew Brown

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or any
later version.

This program 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 for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

package jm.audio.synth;

import jm.audio.AOException;
import jm.audio.AudioObject;

/**
 * This class keeps a sample buffer the length of the
 * current note and feeds them to the chain in the
 * reversed order.
 *
 * @author Andrew Sorensen
 * @version 1.0, Sun Feb 25 18:42:51  2001
 */

public final class NoteBufferReversed extends AudioObject {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------
    private float[] noteBuffer;
    private boolean flag = true;
    private int noteBufferPosition;

    //----------------------------------------------
    // Constructors
    //----------------------------------------------
    public NoteBufferReversed(AudioObject ao) {
        super(ao, "[Volume]");
    }

    //----------------------------------------------
    // Public Methods
    //----------------------------------------------
    public void build() {
        noteBuffer = new float[numOfSamples];
        noteBufferPosition = numOfSamples;
        this.flag = true;
    }

    //----------------------------------------------
    // Protected Methods
    //----------------------------------------------
    public int work(float[] buffer) throws AOException {
        if (flag) {
            int returned = this.previous[0].nextWork(noteBuffer);
            flag = false;
        }
        int i = 0;
        int numof = (noteBufferPosition < buffer.length)
                ? noteBufferPosition : buffer.length;
        for (; i < numof; i++) {
            buffer[i] = noteBuffer[--noteBufferPosition];
        }
        return i;
    }
}