package dk.thoerup.traininfo.provider;




public class ProviderFactory {
	private static DepartureProvider departureProvider = null;
	private static StationProvider stationProvider = null;
	private static TimetableProvider timetableProvider = null;
	private static MetroProvider metroProvider = null;
	
	private static final boolean DEBUG = false;
	
	//TODO: this one really doesn't belong here ... but where should it go ?
	public static void purgeOldEntries() {		
		synchronized (ProviderFactory.class) {
			if (stationProvider != null ) { 
				stationProvider.purgeOldEntries();
			}
			
			if (departureProvider != null ) { 
				departureProvider.purgeOldEntries();
			}
			
			if (timetableProvider != null ) { 
				timetableProvider.purgeOldEntries();
			}
			if (metroProvider != null ) {
				metroProvider.purgeOldEntries();
			}
			
		}

	}
	
	public static DepartureProvider getDepartureProvider() {
		if (departureProvider == null) {
			if (!DEBUG) {
				departureProvider = new XmlDepartureProvider();
			} else {
				departureProvider = new DebugProvider();
			}
		}
		
		return departureProvider;
	}
	
	public static StationProvider getStationProvider() {
		if (stationProvider == null) {
			if (!DEBUG) {
				stationProvider = new XmlStationProvider();
			} else {
				stationProvider = new DebugProvider();
			}
		}
		
		return stationProvider;
	}
	
	public static TimetableProvider getTimetableProvider() {
		if (timetableProvider == null) {
			if (!DEBUG) {
				timetableProvider = new XmlTimetableProvider();
			} else {
				timetableProvider = new DebugProvider();
			}
		}
		return timetableProvider;
	}

	public static MetroProvider getMetroProvider() {
		if (metroProvider == null) {
			if (!DEBUG) {
				metroProvider = new XmlMetroProvider();
			} else {
				metroProvider = new DebugProvider();
			}
		}
		return metroProvider;
	}
}