LastPrice

interface LastPrice {
		
	/**
	 * In order of lowest to highest priority
	 */
	enum Source {
		NULL, PREV_SETTLE, LAST_TRADE, CLOSE, SETTLE
	}
		
	Source source();
		
	Price price();
		
	LastPrice NULL = new LastPrice() {

		@Override
		public Source source() {return Source.NULL;}

		@Override
		public Price price() {return Price.NULL;}
			
	};
		
}

LastPrice lastPrice();