org.apache.commons.betwixt.expression
Class VariableExpression

java.lang.Object
  |
  +--org.apache.commons.betwixt.expression.VariableExpression
All Implemented Interfaces:
Expression

public class VariableExpression
extends java.lang.Object
implements Expression

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

Version:
$Revision: 155402 $
Author:
James Strachan

Constructor Summary
VariableExpression()
          Base constructor
VariableExpression(java.lang.String variableName)
          Convenience constructor sets VariableName property
 
Method Summary
 java.lang.Object evaluate(Context context)
          Return the value of a context variable.
 java.lang.String getVariableName()
          Gets the variable name
 void setVariableName(java.lang.String variableName)
          Sets the variable name
 java.lang.String toString()
          Returns something useful for logging
 void update(Context context, java.lang.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(java.lang.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 java.lang.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 java.lang.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(java.lang.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,
                   java.lang.String newValue)
Do nothing
Specified by:
update in interface Expression
See Also:
Expression

toString

public java.lang.String toString()
Returns something useful for logging
Overrides:
toString in class java.lang.Object
Returns:
something useful for logging


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