org.springframework.webflow.engine.support
Class BooleanExpressionTransitionCriteria

java.lang.Object
  org.springframework.webflow.engine.support.BooleanExpressionTransitionCriteria

All Implemented Interfaces:

TransitionCriteria

public class BooleanExpressionTransitionCriteria
extends java.lang.Object
implements TransitionCriteria

Transition criteria that tests the value of an expression. The expression is used to express a condition that guards transition execution in a web flow. Expressions will be evaluated agains the request context and should return a boolean result.

Author:

Keith Donald, Erwin Vervaet

Constructor Summary

BooleanExpressionTransitionCriteria(org.springframework.binding.expression.Expression booleanExpression)
Create a new expression based transition criteria object.

Method Summary

protected org.springframework.binding.expression.EvaluationContext	getEvaluationContext(RequestContext context) Setup a context with a few aliased values to make writing expression based transition conditions a bit easier.
boolean	test(RequestContext context) Check if the transition should fire based on the given flow execution request context.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

BooleanExpressionTransitionCriteria

public BooleanExpressionTransitionCriteria(org.springframework.binding.expression.Expression booleanExpression)

Create a new expression based transition criteria object.

Parameters:

booleanExpression - the expression evaluator testing the criteria, this expression should be a condition that returns a Boolean value

Method Detail

test

public boolean test(RequestContext context)

Description copied from interface: TransitionCriteria

Check if the transition should fire based on the given flow execution request context.

Specified by:

test in interface TransitionCriteria

Parameters:

context - the flow execution request context

Returns:

true if the transition should fire, false otherwise

getEvaluationContext

protected org.springframework.binding.expression.EvaluationContext getEvaluationContext(RequestContext context)

Setup a context with a few aliased values to make writing expression based transition conditions a bit easier.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object