NatTable/src/org/eclipse/nebula/widgets/nattable/core/layer/impl/AbstractLayer.xtend

package org.eclipse.nebula.widgets.nattable.core.layer.impl

import java.util.LinkedHashSet
import java.util.Set
import org.eclipse.nebula.widgets.nattable.core.layer.Layer
import org.eclipse.nebula.widgets.nattable.core.layer.LayerEvent
import org.eclipse.nebula.widgets.nattable.core.layer.LayerListener

abstract class AbstractLayer implements Layer {
	
	val Set<LayerListener> listeners = new LinkedHashSet
	
	// Layer interface
	
	override addLayerListener(LayerListener listener) { listeners.add(listener) }
	override removeLayerListener(LayerListener listener) { listeners.remove(listener) }
	
	// LayerListener interface
	
	override handleLayerEvent(LayerEvent event) {
		fireLayerEvent(event);
	}
	
	//
	
	/**
	 * Pass the event to all the {@link LayerListener}s registered on this layer.
	 */
	def fireLayerEvent(LayerEvent event) {
		for (listener : listeners)
			listener.handleLayerEvent(event)
	}
	
}