//The "heart" of the order matcher....ensures rules are applied correctly and the order
//book is updated properly


package fauxExchange;

import java.util.Vector;

class RuleManager {
	
	//--[ Constructors ]--------
	public RuleManager(){}
	
	//--[ MemberDate ]----------
	private Vector rules = new Vector();	
	
	//--[MemberMethods ]---------
	public void addRule(Rule r){
		rules.addElement(r);
	}
	
	//not implemented yet...maybe useful later
	public void deleteRule(Rule r){
		rules.removeElement(r);
	}
	
	/**
	 * This method applies each rule owned by this manager
	 * in order.  Each rule is applied continually until either
	 * the rule does not match for a trade or the order
	 * has a size of zero (all shared have been matched)
	 *
	 * The next rule is applied if it exists and the size
	 * of the order is not 0.
	 */
	public void applyRules (OrderBook ob, Order o) throws TradeClosedException {
		// Iterator to iterate across rules
		java.util.Iterator rulesIter = rules.iterator();
		
		while (rulesIter.hasNext() && (o == null || o.getSize() != 0)){
			Rule r = (Rule)rulesIter.next();
			
			while (r.fitsCriteria(ob, o)){
				// This may throw a TradeClosedException.  If so, the trade
				// is not published and no further rules are processed.  The
				// order book state is maintained
				
				Trade t = r.processRule (ob, o);
				
				if (t == null){
					break;				
				}
				else {
					// Must publish trade here!
					ob.publishTrade(t);
				}
				
				if (o == null || o.getSize() == 0) break;
			}
		}
		
		return;
	}
		
} //end class