collect Midi Device Info - Java javax.sound.midi

Java examples for javax.sound.midi:MidiDevice

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Description

collect Midi Device Info

Demo Code

/* Copyright (C) 2006 Christian Schneider
 * //from  ww w. j  a v  a 2s.  c om
 * This file is part of Nomad.
 * 
 * Nomad 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
 * (at your option) any later version.
 * 
 * Nomad 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 Nomad; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
//package com.java2s;
import java.util.Collection;

import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;

public class Main {
    public static void collectMidiDeviceInfo(Collection<MidiDevice.Info> c,
            boolean hardware, boolean software, boolean inputs,
            boolean outputs, boolean onlyAvailable) {
        if ((!(hardware || software)) || (!(inputs || outputs))) {
            // empty set, nothing to add to the collection
            return;
        }

        MidiDevice.Info[] list = MidiSystem.getMidiDeviceInfo();

        for (int i = 0; i < list.length; i++) {

            MidiDevice.Info info = list[i];

            try {
                if (!((hardware && isHardwareDevice(info)) || (software && isSoftwareDevice(info)))) {
                    continue;
                }
            } catch (MidiUnavailableException e) {
                // do not add info in this case
                continue;
            }

            try {
                if (onlyAvailable) {
                    if ((inputs && isInputDeviceAvailable(info))
                            || (outputs && isOutputDeviceAvailable(info))) {
                        c.add(info);
                    }
                } else {
                    if ((inputs && isInputDevice(info))
                            || (outputs && isOutputDevice(info))) {
                        c.add(info);
                    }
                }
            } catch (MidiUnavailableException e) {
                // do not add info in this case
            }
        }
    }

    public static boolean isHardwareDevice(MidiDevice device) {
        return !isSoftwareDevice(device);
    }

    public static boolean isHardwareDevice(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return isHardwareDevice(getMidiDevice(deviceInfo));
    }

    public static boolean isSoftwareDevice(MidiDevice device) {
        return device instanceof javax.sound.midi.Sequencer
                || device instanceof javax.sound.midi.Synthesizer;
    }

    public static boolean isSoftwareDevice(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return isSoftwareDevice(getMidiDevice(deviceInfo));
    }

    public static boolean isInputDeviceAvailable(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return isInputDeviceAvailable(getMidiDevice(deviceInfo));
    }

    public static boolean isInputDeviceAvailable(MidiDevice device) {
        return hasAvailableTransmitters(device);
    }

    public static boolean isOutputDeviceAvailable(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return isOutputDeviceAvailable(getMidiDevice(deviceInfo));
    }

    public static boolean isOutputDeviceAvailable(MidiDevice device) {
        return hasAvailableReceivers(device);
    }

    public static boolean isInputDevice(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return isInputDevice(getMidiDevice(deviceInfo));
    }

    public static boolean isInputDevice(MidiDevice device) {
        return allowsTransmitters(device);
    }

    public static boolean isOutputDevice(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return isOutputDevice(getMidiDevice(deviceInfo));
    }

    public static boolean isOutputDevice(MidiDevice device) {
        return allowsReceivers(device);
    }

    public static MidiDevice getMidiDevice(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        try {
            return MidiSystem.getMidiDevice(deviceInfo);
        } catch (IllegalArgumentException e) {
            // the device does not exist anymore - 
            // this seems to be a bug because MidiUnavailableException should
            // be thrown instead
            MidiUnavailableException m = new MidiUnavailableException();
            m.initCause(e);
            throw m;
        }
    }

    public static boolean hasAvailableTransmitters(MidiDevice device) {
        return probe(device.getMaxTransmitters());
    }

    public static boolean hasAvailableReceivers(MidiDevice device) {
        return probe(device.getMaxReceivers());
    }

    public static boolean allowsTransmitters(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return allowsTransmitters(getMidiDevice(deviceInfo));
    }

    public static boolean allowsTransmitters(MidiDevice device) {
        return probe(device.getMaxTransmitters())
                || probe(device.getTransmitters());
    }

    public static boolean allowsReceivers(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return allowsReceivers(getMidiDevice(deviceInfo));
    }

    public static boolean allowsReceivers(MidiDevice device) {
        return probe(device.getMaxReceivers())
                || probe(device.getReceivers());
    }

    private static boolean probe(Collection<?> receiverTransmitterList) {
        return !receiverTransmitterList.isEmpty();
    }

    private static boolean probe(int receivertransmitter) {
        return receivertransmitter == -1 || receivertransmitter > 0;
    }
}

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