package gve.calc.formula;

import java.awt.*;

 @version 28 Sep 1997
  @author Geert Vernaeve
 
public class Real extends StaticString {
	// if string == null, then the doubleValue is valid.
	// if string != null, then the doubleValue is invalid.
	public double doubleValue;

	public String getName() { return ""+doubleValue; }

	public Real(double value) {
		doubleValue = value;
	}

	public Object clone() {
		return new Real(doubleValue);
	}

	
 All Real objects returned by evaluate() should
	  have a valid doubleValue field. Since all objects
	  returned by evaluate() may be modified on the fly,
	  we should create a copy of this Real.
	  This is not very efficient, certainly not when plotting functions.
	public Part evaluate(Evaluator ev) {
		return new Real(getDoubleValue());
	}

	public double getDoubleValue() {
		return doubleValue;
	}

	// PENDING: A Real can be equal to an Interval of type [a,a]
	public boolean same(Object o) {
		if (!(o instanceof Real)) return false;
		Real r = (Real)o;
		return r.getDoubleValue() == getDoubleValue();
	}

	public String toString() {
		return "Real["+doubleValue+"]";
	}
}