Package org.apache.commons.jelly.expression

Class ConstantExpression

java.lang.Object

org.apache.commons.jelly.expression.ExpressionSupport

org.apache.commons.jelly.expression.ConstantExpression

All Implemented Interfaces:

Expression

public class ConstantExpression
extends ExpressionSupport

ConstantExpression represents a constant expression.

In other words, evaluate(org.apache.commons.jelly.JellyContext) returns a value independent of the context.

Version:

$Revision: 155420 $

Author:

James Strachan

Field Summary

Fields inherited from class org.apache.commons.jelly.expression.ExpressionSupport

EMPTY_ITERATOR

Fields inherited from interface org.apache.commons.jelly.expression.Expression

NULL

Constructor Summary

Constructors

Constructor	Description
ConstantExpression()	Base constructor
ConstantExpression(Object value)	Convenience constructor sets value property.

Method Summary

Modifier and Type	Method	Description
Object	evaluate(JellyContext context)	Evaluate expression against given context.
String	getExpressionText()
Object	getValue()	Gets the constant value of this expression
void	setValue(Object value)	Sets the constant value of this expression
String	toString()

Methods inherited from class org.apache.commons.jelly.expression.ExpressionSupport

evaluateAsBoolean, evaluateAsIterator, evaluateAsString, evaluateRecurse

Methods inherited from class java.lang.Object

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

Constructor Details

ConstantExpression

public ConstantExpression()

Base constructor

ConstantExpression

public ConstantExpression(Object value)

Convenience constructor sets value property.

Method Details

toString

public String toString()

Overrides:

toString in class Object

getExpressionText

public String getExpressionText()

Returns:

the textual representation of this expression

evaluate

public Object evaluate(JellyContext context)

Evaluate expression against given context.

Parameters:

context - evaluate expression against this context

Returns:

current value of value property

getValue

public Object getValue()

Gets the constant value of this expression

setValue

public void setValue(Object value)

Sets the constant value of this expression