package foundation.variant.provider;

public enum DataEvent {
	
	New, Save, Insert, Update, Delete, Commit, PulllBack, StateBack, StateEnd, toChange, toClose, Unknown;

	public static DataEvent parse(String value) {
		if (value == null) {
			return Unknown;
		}
		
		value = value.toLowerCase();
		
		if ("new".equals(value)) {
			return New;
		}
		else if ("save".equals(value)) {
			return Save;
		}
		else if ("insert".equals(value)) {
			return Insert;
		}
		else if ("update".equals(value)) {
			return Update;
		}
		else if ("delete".equals(value)) {
			return Delete;
		}
		else if ("commit".equals(value)) {
			return Commit;
		}	
		else if ("tochange".equals(value)) {
			return toChange;
		}
		else if ("toclose".equals(value)) {
			return toClose;
		}		
		
		return Unknown;
	}
	
	public boolean isCompatibleWith(DataEvent dataEvent) {
		if (dataEvent == null) {
			return false;
		}
		
		if (this == dataEvent) {
			return true;
		}
		
		if ((this == Insert || this == New) && dataEvent == Commit) {
			return true;
		}
		
		if (this == Insert && dataEvent == New) {
			return true;
		}
		
		if (this == Save && (dataEvent == Insert || dataEvent == Update || dataEvent == Commit)) {
			return true;
		}
		
		if (dataEvent == Save && (this == Insert || this == Update || this == Commit)) {
			return true;
		}
		
		if (this == Update && dataEvent == Commit) {
			return true;
		}
		
		return false;
	}
	
}