Add basic MIDI functionality

Adds a MIDIDevice class that wraps a reciever device and a transmitter device, and adds MIDI functionality to the TestControlMIDI.

buttonbox-bridge-midi/src/main/java/io/github/roboblazers7617/buttonbox/controls/TestControlMIDI.java

@@ -1,22 +1,39 @@
 package io.github.roboblazers7617.buttonbox.controls;
 
+import javax.sound.midi.ShortMessage;
+import javax.sound.midi.InvalidMidiDataException;
+
+import io.github.roboblazers7617.buttonbox.midi.MIDIDevice;
+
 /**
  * A test {@link io.github.roboblazers7617.buttonbox.Control} that reads the data published by a {@link io.github.roboblazers7617.buttonbox.controls.TestControl} and outputs it as MIDI messages.
  */
 public class TestControlMIDI extends TestControl {
+	private final MIDIDevice midiDevice;
+
 	/**
 	 * Creates a new TestControlMIDI.
 	 *
 	 * @param id
 	 *                The ID string for the TestControlMIDI to use.
+	 * @param midiDevice
+	 *                The MIDI device to send messages to.
 	 * @see io.github.roboblazers7617.buttonbox.Control
 	 */
-	public TestControlMIDI(String id) {
+	public TestControlMIDI(String id, MIDIDevice midiDevice) {
 		super(id);
+		this.midiDevice = midiDevice;
 	}
 
 	@Override
 	public void updateHardware() {
 		System.out.println(getValue());
+		try {
+			ShortMessage message = new ShortMessage();
+			message.setMessage(ShortMessage.CONTROL_CHANGE, 0, 0, (int) (getValue() % 127));
+			midiDevice.send(message);
+		} catch (InvalidMidiDataException ex) {
+			System.err.println("Invalid MIDI data!");
+		}
 	}
 }

buttonbox-bridge-midi/src/main/java/io/github/roboblazers7617/buttonbox/midi/MIDIDevice.java

@@ -0,0 +1,35 @@
+package io.github.roboblazers7617.buttonbox.midi;
+
+import javax.sound.midi.MidiDevice;
+import javax.sound.midi.MidiUnavailableException;
+import javax.sound.midi.Receiver;
+import javax.sound.midi.ShortMessage;
+import javax.sound.midi.Transmitter;
+
+public class MIDIDevice {
+	private final MidiDevice rxDevice;
+	private final MidiDevice txDevice;
+	private final Receiver receiver;
+	private final Transmitter transmitter;
+
+	/**
+	 * Wrapper for {@link MidiDevice}
+	 *
+	 * @param rxDevice
+	 *                {@link MidiDevice} to use for receiving messages
+	 * @param txDevice
+	 *                {@link MidiDevice} to use for transmitting messages
+	 * @implNote
+	 *           Provided devices must already be opened.
+	 */
+	public MIDIDevice(MidiDevice rxDevice, MidiDevice txDevice) throws MidiUnavailableException {
+		this.rxDevice = rxDevice;
+		this.txDevice = txDevice;
+		this.receiver = rxDevice.getReceiver();
+		this.transmitter = txDevice.getTransmitter();
+	}
+
+	public void send(ShortMessage message) {
+		receiver.send(message, -1);
+	}
+}