package gve.calc.formula;

import java.awt.*;

 @version 28 Sep 1997
  @author Geert Vernaeve
 
public class Interval extends Part {
	public double low,high;
	public boolean openLow,openHigh;

	public Interval(double l,double h,boolean openL,boolean openH) {
		if (l < h) {
			low = l; high = h;
			openLow = openL; openHigh = openH;
		} else {
			low = h; high = l;
			openLow = openH; openHigh = openL;
		}
	}

	public Object clone() {
		if (low == high) return new Real(low);
		return new Interval(low,high,openLow,openHigh);
	}

	
 An Interval can be equal to a Real if it is of type [a,a] 
	public boolean equals(Object obj) {
		if (low==high && obj instanceof Real)
			if (!openLow && !openHigh &&
				((Real)obj).doubleValue == low) return true;
		if (!(obj instanceof Interval)) return false;
		return ((Interval)obj).low==low && ((Interval)obj).high==high
			&& ((Interval)obj).openLow==openLow
			&& ((Interval)obj).openHigh==openHigh;
	}

	public Part evaluate(Evaluator ev) {
		return (Part)clone();
	}

	public String toString() {
		return "Interval " + (openLow?']':'[') + low +","+ high + (openHigh?'[':']');
	}
}