Unnecessary lambda usage

[kaka/cakelight.git] / src / kaka / cakelight / VideoDeviceListener.java

package kaka.cakelight;

import java.io.File;
import java.util.Optional;
import java.util.function.Consumer;

import static kaka.cakelight.Main.log;

public class VideoDeviceListener {
    private Thread thread;
    private Consumer<Optional<File>> changeConsumer;
    private File lastDevice = null;

    public void startListening() {
	thread = new Thread() {
	    public void run() {
		try {
		    while (!isInterrupted()) {
			Optional<File> device = findVideoDevice();
			if (!device.equals(Optional.ofNullable(lastDevice))) {
			    log("Video device change: %s", device.map(File::getAbsolutePath).orElse("none"));
			    changeConsumer.accept(device);
			    lastDevice = device.orElse(null);
			}
			Thread.sleep(1000);
		    }
		} catch (InterruptedException e) {
		}
	    }
	};
	thread.start();
    }

    public void stopListening() {
        thread.interrupt();
    }

    private Optional<File> findVideoDevice() {
	File[] files = new File("/dev").listFiles((dir, name) -> name.matches("video[0-9]+"));
	if (files == null || files.length == 0) {
	    return Optional.empty();
	} else {
	    return Optional.of(files[0]);
	}
    }

    public void onVideoDeviceChange(Consumer<Optional<File>> consumer) {
	changeConsumer = consumer;
    }
}