org.apache.commons.betwixt.expression

Class VariableExpression

java.lang.Object

org.apache.commons.betwixt.expression.VariableExpression

All Implemented Interfaces:

Expression

public class VariableExpression
extends Object
implements Expression

VariableExpression represents a variable expression such as $foo which returns the value of the given variable.

Version:

$Revision: 438373 $

Author:

James Strachan

Constructor Summary

Constructors

Constructor and Description
VariableExpression() Base constructor
VariableExpression(String variableName) Convenience constructor sets VariableName property

Method Summary

Methods

Modifier and Type	Method and Description
Object	evaluate(Context context) Return the value of a context variable.
String	getVariableName() Gets the variable name
void	setVariableName(String variableName) Sets the variable name
String	toString() Returns something useful for logging
void	update(Context context, String newValue) Do nothing

Methods inherited from class java.lang.Object

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

Constructor Detail

VariableExpression

public VariableExpression()

Base constructor

VariableExpression

public VariableExpression(String variableName)

Convenience constructor sets VariableName property

Parameters:

variableName - the name of the context variable whose value will be returned by an evaluation

Method Detail

evaluate

public Object evaluate(Context context)

Return the value of a context variable.

Specified by:

evaluate in interface Expression

Parameters:

context - evaluate against this context

Returns:

the value of the context variable named by the VariableName property

getVariableName

public String getVariableName()

Gets the variable name

Returns:

the name of the context variable whose value will be returned by an evaluation

setVariableName

public void setVariableName(String variableName)

Sets the variable name

Parameters:

variableName - the name of the context variable whose value will be returned by an evaluation

update

public void update(Context context,
          String newValue)

Do nothing

Specified by:

update in interface Expression

Parameters:

context - update this Context

newValue - the new value for this expression

See Also:

Expression

toString

public String toString()

Returns something useful for logging

Overrides:

toString in class Object

Returns:

something useful for logging