uk.pigpioj.PigpioJ Maven / Gradle / Ivy

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package uk.pigpioj;

public class PigpioJ {
	private static final String PIGPIOD_HOST = "PIGPIOD_HOST";
	private static final String PIGPIOD_PORT = "PIGPIOD_PORT";
	
	private static PigpioInterface pigpioImpl;

	public synchronized static PigpioInterface getImplementation() {
		if (pigpioImpl == null) {
			String pigpiod_hostname = getProperty(PIGPIOD_HOST);
			
			if (pigpiod_hostname != null) {
				PigpioSocket pigpiod = new PigpioSocket();
				
				String pigpiod_port_str = getProperty(PIGPIOD_PORT);
				int pigpiod_port = PigpioSocket.DEFAULT_PORT;
				if (pigpiod_port_str != null) {
					pigpiod_port = Integer.parseInt(pigpiod_port_str);
				}
				
				try {
					pigpiod.connect(pigpiod_hostname, pigpiod_port);
					pigpioImpl = pigpiod;
				} catch (InterruptedException e) {
					throw new RuntimeException("Error connecting to pigpiod at " + pigpiod_hostname + ":" + pigpiod_port);
				}
			} else {
				pigpioImpl = new PigpioJNI();
			}
		}
		
		return pigpioImpl;
	}

	private static String getProperty(String property) {
		// -D parameter takes priority over environment parameter
		String value = System.getProperty(property);
		if (value == null) {
			value = System.getenv(property);
		}
		return value;
	}
}