private String ensureFilterType(){
		String filterType = null;
		if(EQ.startsWith(filterName)){
			filterType = EQ;
		}else if(LT.startsWith(filterName)){
			filterType = LT;
		}else if(GT.startsWith(filterName)){
			filterType = GT;
		}else if(CONTAINS.startsWith(filterName)){
			filterType = CONTAINS;
		}else if(EMPTY.startsWith(filterName)){
			filterType = EMPTY;	
		}else if(EVEN.startsWith(filterName)){
			filterType = EVEN;			
		}else if(FIRST.startsWith(filterName)){
			filterType = FIRST;			
		}else if(LAST.startsWith(filterName)){
			filterType = LAST;			
		}else if(ODD.startsWith(filterName)){
			filterType = ODD;
		}
		
		return filterType;
	}