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 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package net.java.games.input;

import java.io.IOException;

/** helper methods for Linux specific Controllers
* @author elias
* @version 1.0
*/
final class LinuxControllers {
	private final static LinuxEvent linux_event = new LinuxEvent();

	/* Declared synchronized to protect linux_event */
	public final static synchronized boolean getNextDeviceEvent(Event event, LinuxEventDevice device) throws IOException {
		while (device.getNextEvent(linux_event)) {
			LinuxAxisDescriptor descriptor = linux_event.getDescriptor();
			LinuxComponent component = device.mapDescriptor(descriptor);
			if (component != null) {
				float value = component.convertValue(linux_event.getValue(), descriptor);
				event.set(component, value, linux_event.getNanos());
				return true;
			}
		}
		return false;
	}

	private final static LinuxAbsInfo abs_info = new LinuxAbsInfo();

	/* Declared synchronized to protect abs_info */
	public final static synchronized float poll(LinuxEventComponent event_component) throws IOException {
		int native_type = event_component.getDescriptor().getType();
		switch (native_type) {
			case NativeDefinitions.EV_KEY:
				int native_code = event_component.getDescriptor().getCode();
				float state = event_component.getDevice().isKeySet(native_code) ? 1f : 0f;
				return state;
			case NativeDefinitions.EV_ABS:
				event_component.getAbsInfo(abs_info);
				return abs_info.getValue();
			default:
				throw new RuntimeException("Unkown native_type: " + native_type);
		}
	}
}