NavigationAuthorizationEvent.java

package kornell.gui.client.event;

import com.google.gwt.event.shared.GwtEvent;

public class NavigationAuthorizationEvent extends GwtEvent<NavigationAuthorizationEventHandler> {
	public static final Type<NavigationAuthorizationEventHandler> TYPE = new Type<NavigationAuthorizationEventHandler>();
	
	public enum Forecast {
		NEXT_OK,
		NEXT_NOT_OK,
		PREV_OK,
		PREV_NOT_OK;
		
		public NavigationAuthorizationEvent get(){
			return new NavigationAuthorizationEvent(this);
		}
	} 
	
	public NavigationAuthorizationEvent(Forecast forecast){
		this.forecast = forecast;
	}
	
	Forecast forecast;
	
	private static final NavigationAuthorizationEvent NEXT_OK = new NavigationAuthorizationEvent(Forecast.NEXT_OK);
	private static final NavigationAuthorizationEvent NEXT_NOT_OK = new NavigationAuthorizationEvent(Forecast.NEXT_NOT_OK);
	private static final NavigationAuthorizationEvent PREV_OK = new NavigationAuthorizationEvent(Forecast.PREV_OK);
	private static final NavigationAuthorizationEvent PREV_NOT_OK = new NavigationAuthorizationEvent(Forecast.PREV_NOT_OK);
	
	@Override
	public Type<NavigationAuthorizationEventHandler> getAssociatedType() {
		return TYPE;
	}
	
	public static NavigationAuthorizationEvent next(boolean isOK) {		
		return isOK ? NEXT_OK : NEXT_NOT_OK;
	}
	
	public static NavigationAuthorizationEvent prev(boolean isOK) {		
		return isOK ? PREV_OK : PREV_NOT_OK;
	}

	@Override
	protected void dispatch(NavigationAuthorizationEventHandler handler) {
		switch(forecast){
		case NEXT_OK: handler.onNextActivityOK(this);
			break;
		case NEXT_NOT_OK: handler.onNextActivityNotOK(this);
		  	break;
		case PREV_OK: handler.onPrevActivityOK(this);
			break;
		case PREV_NOT_OK: handler.onPrevActivityNotOK(this);
			break;
		}
	}

}