package rpn.basic;

import java.util.Hashtable;
import rpn.Calculator;

public class OrItem extends Item {

	public OrItem(Calculator ca) {
		super(ca);
		ca.systemInstall(this);
	}
	
	public void exec() {
		if (ca.check(2)) {
			Item a = ca.peek(1);
			Item b = ca.peek(0);
			if (a instanceof BooleanItem 
				&& b instanceof BooleanItem) {
				boolean x = ((BooleanItem) a).v;
				boolean y = ((BooleanItem) b).v;
				ca.pop(2);
				ca.push(new BooleanItem(ca, x || y));
			}
			else {
				ca.error(this, CalcErr.Type);
			}
		} else {
			ca.error(this, CalcErr.Underflow);
		}
	}
	
	public String toString() {
		return("or");
	}
}