net.christopherschultz.evaluator
Class IdentifierExpression

java.lang.Object
  net.christopherschultz.evaluator.Expression
      net.christopherschultz.evaluator.ConstantExpression
          net.christopherschultz.evaluator.IdentifierExpression

public class IdentifierExpression
extends ConstantExpression

An Expression which represents an identifier.

Version:

$Revision: 1.5 $ $Date: 2008-06-20 22:58:48 $

Author:

Chris Schultz

Constructor Summary

IdentifierExpression(String identifier)
Creates a new IdentifierExpression with the given identifier.

Method Summary

void	acceptVisitor(ExpressionVisitor visitor) Accepts an ExpressionVisitor.
Object	evaluate(EvaluationContext ec) Evaluates this Expression by returning its constant value.
String	getIdentifier() Gets the symbol used by this identifier.
String	getSymbol() Gets the symbol used by this identifier.
String	toString() Returns a String representation of this Expression.

Methods inherited from class net.christopherschultz.evaluator.ConstantExpression

equals, getSubExpressions, getValue, hashCode

Methods inherited from class net.christopherschultz.evaluator.Expression

getParent, setParent

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

IdentifierExpression

public IdentifierExpression(String identifier)

Creates a new IdentifierExpression with the given identifier.

Parameters:

identifier - The identifier for this IdentifierExpressions.

Throws:

IllegalArgumentException - If the identifier is null or empty.

Method Detail

getSymbol

public String getSymbol()

Gets the symbol used by this identifier.

getIdentifier

public String getIdentifier()

Gets the symbol used by this identifier.

acceptVisitor

public void acceptVisitor(ExpressionVisitor visitor)

Description copied from class: Expression

Accepts an ExpressionVisitor.

Overrides:

acceptVisitor in class ConstantExpression

evaluate

public Object evaluate(EvaluationContext ec)
                throws EvaluationException

Description copied from class: ConstantExpression

Evaluates this Expression by returning its constant value.

Overrides:

evaluate in class ConstantExpression

Parameters:

ec - The EvaluationContext in which this expression should be evaluated.

Returns:

The value of this constant Expression.

Throws:

EvaluationException - If there is an error evaluating this Expression.

toString

public String toString()

Description copied from class: ConstantExpression

Returns a String representation of this Expression.

Overrides:

toString in class ConstantExpression

Returns:

A String representation of this Expression.