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: 1.9 $

Author:

James Strachan

Field Summary

private java.lang.Object

value The value of this expression

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

EMPTY_ITERATOR

Constructor Summary

ConstantExpression()
Base constructor

ConstantExpression(java.lang.Object value)
Convenience constructor sets value property.

Method Summary

java.lang.Object	evaluate(JellyContext context) Evaluate expression against given context.
java.lang.String	getExpressionText()
java.lang.Object	getValue() Gets the constant value of this expression
void	setValue(java.lang.Object value) Sets the constant value of this expression
java.lang.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

Field Detail

value

private java.lang.Object value

The value of this expression

Constructor Detail

ConstantExpression

public ConstantExpression()

Base constructor

ConstantExpression

public ConstantExpression(java.lang.Object value)

Convenience constructor sets value property.

Method Detail

toString

public java.lang.String toString()

getExpressionText

public java.lang.String getExpressionText()

Returns:

the textual representation of this expression

evaluate

public java.lang.Object evaluate(JellyContext context)

Evaluate expression against given context.

Parameters:

context - evaluate expression against this context

Returns:

current value of value property

getValue

public java.lang.Object getValue()

Gets the constant value of this expression

setValue

public void setValue(java.lang.Object value)

Sets the constant value of this expression