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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.keyboard;

import com.github.bloodshura.ignitium.collection.list.XList;
import com.github.bloodshura.ignitium.collection.list.impl.XArrayList;
import com.github.bloodshura.ignitium.collection.view.XBasicView;
import com.github.bloodshura.ignitium.collection.view.XView;
import com.github.bloodshura.ignitium.input.Key;
import com.github.bloodshura.ignitium.input.KeyListener;
import com.github.bloodshura.ignitium.ntv.NativeException;

import javax.annotation.Nonnull;

public abstract class AbstractKeyboardWatcher implements KeyboardWatcher {
	protected final XList pressedKeys;
	private final XList hooks;
	private long lastPollMillis;
	private final KeyboardMapping mapping;

	public AbstractKeyboardWatcher(@Nonnull KeyboardMapping mapping) throws NativeException {
		this.hooks = new XArrayList<>();
		this.mapping = mapping;
		this.pressedKeys = new XArrayList<>();

		pressedKeys.addInsertionListener(key -> getHooks().forEach(hook -> hook.keyPressed(key)));
		pressedKeys.addRemovalListener(key -> getHooks().forEach(hook -> hook.keyReleased(key)));
	}

	@Override
	public void dispose() throws NativeException {
		hooks.clear();
		pressedKeys.clear();
	}

	@Nonnull
	@Override
	public final XList getHooks() {
		return hooks;
	}

	@Nonnull
	public KeyboardMapping getMapping() {
		return mapping;
	}

	@Nonnull
	@Override
	public final XView getPressedKeys() {
		return new XBasicView<>(pressedKeys);
	}
}