src/java.desktop/share/classes/com/sun/media/sound/SoftReceiver.java

/*
 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. 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.  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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.media.sound;

import java.util.TreeMap;

import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiDeviceReceiver;
import javax.sound.midi.MidiMessage;
import javax.sound.midi.ShortMessage;

/**
 * Software synthesizer MIDI receiver class.
 *
 * @author Karl Helgason
 */
public final class SoftReceiver implements MidiDeviceReceiver {

    boolean open = true;
    private final Object control_mutex;
    private final SoftSynthesizer synth;
    TreeMap<Long, Object> midimessages;
    SoftMainMixer mainmixer;

    public SoftReceiver(SoftSynthesizer synth) {
        this.control_mutex = synth.control_mutex;
        this.synth = synth;
        this.mainmixer = synth.getMainMixer();
        if (mainmixer != null)
            this.midimessages = mainmixer.midimessages;
    }

    @Override
    public MidiDevice getMidiDevice() {
        return synth;
    }

    @Override
    public void send(MidiMessage message, long timeStamp) {

        synchronized (control_mutex) {
            if (!open)
                throw new IllegalStateException("Receiver is not open");
        }

        if (timeStamp != -1) {
            synchronized (control_mutex) {
                mainmixer.activity();
                while (midimessages.get(timeStamp) != null)
                    timeStamp++;
                if (message instanceof ShortMessage
                        && (((ShortMessage)message).getChannel() > 0xF)) {
                    midimessages.put(timeStamp, message.clone());
                } else {
                    midimessages.put(timeStamp, message.getMessage());
                }
            }
        } else {
            mainmixer.processMessage(message);
        }
    }

    @Override
    public void close() {
        synchronized (control_mutex) {
            open = false;
        }
        synth.removeReceiver(this);
    }
}