com.mpobjects.bdparsii.eval

Class VariableReference

java.lang.Object

com.mpobjects.bdparsii.eval.VariableReference

All Implemented Interfaces:

Expression

public final 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
BigDecimal	evaluate(MathContext mathContext) Evaluates the expression to a BigDecimal number.
boolean	isConstant() Determines the this expression is constant
Expression	simplify(MathContext mathContext) 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

Methods inherited from interface com.mpobjects.bdparsii.eval.Expression

evaluate, getMathContext

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 BigDecimal evaluate(MathContext mathContext)

Description copied from interface: Expression

Evaluates the expression to a BigDecimal number.

Specified by:

evaluate in interface Expression

Parameters:

mathContext - Use this math context during calculation instead of the one provided during parsing. Does not affect already simplified subexpressions.

Returns:

the double value as a result of evaluating this expression.

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(MathContext mathContext)

Description copied from interface: Expression

Returns a simplified version of this expression.

Specified by:

simplify in interface Expression

Parameters:

mathContext - Match context used during simplification.

Returns:

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