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An API for working with native system APIs, with a higher-level interface.

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package com.github.bloodshura.ignitium.ntv.mouse.impl;

import com.github.bloodshura.ignitium.geometry.position.Position;
import com.github.bloodshura.ignitium.ntv.ErrorCodeNativeException;
import com.github.bloodshura.ignitium.ntv.NativeException;
import com.github.bloodshura.ignitium.ntv.mouse.AbstractMouseHandler;
import com.github.bloodshura.ignitium.worker.ArrayWorker;
import com.sun.jna.platform.unix.X11;
import com.sun.jna.platform.unix.X11.Display;
import com.sun.jna.platform.unix.X11.Window;
import com.sun.jna.platform.unix.X11.WindowByReference;
import com.sun.jna.ptr.IntByReference;

import javax.annotation.Nonnull;

// TODO Test (and improve) behaviour when on multi-screen devices...
public class X11MouseHandler extends AbstractMouseHandler {
	private Display display;
	private final IntByReference[] references;

	public X11MouseHandler() throws NativeException {
		this.display = X11.INSTANCE.XOpenDisplay(null);
		this.references = new IntByReference[5];

		if (display == null) {
			throw new ErrorCodeNativeException("Could not open X11 display");
		}

		ArrayWorker.fill(references, IntByReference::new);
	}

	@Override
	public void dispose() throws NativeException {
		ensureNotDisposed();

		int status = X11.INSTANCE.XCloseDisplay(display);

		if (status != X11.Success) {
			throw new ErrorCodeNativeException("Could not dispose X11 display", status);
		}

		this.display = null;

		ArrayWorker.fill(references, () -> null);
	}

	@Nonnull
	@Override
	public Position getPosition() throws NativeException {
		ensureNotDisposed();

		int screen = X11.INSTANCE.XDefaultScreen(display);
		Window window = X11.INSTANCE.XRootWindow(display, screen);

		synchronized (references) {
			if (X11.INSTANCE.XQueryPointer(display, window, new WindowByReference(), new WindowByReference(), references[0], references[1], references[2], references[3], references[4])) {
				return new Position(references[0].getValue(), references[1].getValue());
			}
		}

		throw new ErrorCodeNativeException("Could not query X11 pointer location");
	}

	private void ensureNotDisposed() throws NativeException {
		if (display == null) {
			throw new NativeException("Mouse handler already disposed");
		}
	}
}