li.rudin.arduino.core.ObservableArduino Maven / Gradle / Ivy

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package li.rudin.arduino.core;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import li.rudin.arduino.api.Arduino;
import li.rudin.arduino.api.listener.ArduinoListener;
import li.rudin.arduino.api.state.ConnectionState;

public abstract class ObservableArduino implements Arduino
{
	
	private final List listeners = new CopyOnWriteArrayList<>();

	@Override
	public void addListener(ArduinoListener listener)
	{
		listeners.add(listener);
	}

	@Override
	public void removeListener(ArduinoListener listener)
	{
		listeners.remove(listener);
	}
	
	/**
	 * Fires the rx event
	 * @param key
	 * @param value
	 */
	public void fireReceived(String key, String value)
	{
		for (ArduinoListener l: listeners)
			l.onMessageReceived(key, value);
	}

	/**
	 * Fires the tx event
	 * @param key
	 * @param value
	 */
	public void fireTransmitted(String key, String value)
	{
		for (ArduinoListener l: listeners)
			l.onMessageTransmitted(key, value);
	}
	
	private ConnectionState lastCurrentState = ConnectionState.DISCONNECTED;
	private ConnectionState lastTargetState = ConnectionState.CONNECTED;
	
	/**
	 * Fires a state change event based on the current states
	 */
	public void fireStateChange()
	{
		ConnectionState connectionState = getCurrentState();
		ConnectionState targetState = getTargetState();
		
		if (connectionState != lastCurrentState || targetState != lastTargetState)
			for (ArduinoListener l: listeners)
				l.onStateChange(getCurrentState(), getTargetState());
		
		lastCurrentState = connectionState;
		lastTargetState = targetState;
	}

}