parsii.eval

Class VariableReference

java.lang.Object

parsii.eval.VariableReference

All Implemented Interfaces:

Expression

public class VariableReference
extends Object
implements Expression

Represents a reference to a variable.

Constructor Summary

Constructors

Constructor and Description
VariableReference(Variable var) Creates a new reference to the given variable.

Method Summary

Modifier and Type	Method and Description
double	evaluate() Evaluates the expression to a double number.
boolean	isConstant() Determines the this expression is constant
Expression	simplify() Returns a simplified version of this expression.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

VariableReference

public VariableReference(Variable var)

Creates a new reference to the given variable.

Parameters:

var - the variable to access when this expression is evaluated

Method Detail

evaluate

public double evaluate()

Description copied from interface: Expression

Evaluates the expression to a double number.

Specified by:

evaluate in interface Expression

Returns:

the double value as a result of evaluating this expression. Returns NaN if an error occurs

toString

public String toString()

Overrides:

toString in class Object

isConstant

public boolean isConstant()

Description copied from interface: Expression

Determines the this expression is constant

Specified by:

isConstant in interface Expression

Returns:

true if the result of evaluate will never change and does not depend on external state like variables

simplify

public Expression simplify()

Description copied from interface: Expression

Returns a simplified version of this expression.

Specified by:

simplify in interface Expression

Returns:

a simplified version of this expression or this if the expression cannot be simplified