org.springframework.webflow.action
Class EvaluateAction

java.lang.Object
  org.springframework.webflow.action.AbstractAction
      org.springframework.webflow.action.EvaluateAction

All Implemented Interfaces:

org.springframework.beans.factory.InitializingBean, Action

public class EvaluateAction
extends AbstractAction

An action that evaluates an expression and optionally exposes its result.

Delegates to a helper ResultEventFactorySelector strategy to determine how to map the evaluation result to an action outcome Event.

Author:

Keith Donald

See Also:

Expression, ActionResultExposer, ResultEventFactorySelector

Field Summary

Fields inherited from class org.springframework.webflow.action.AbstractAction

logger

Constructor Summary

EvaluateAction(org.springframework.binding.expression.Expression expression)
Create a new evaluate action.

EvaluateAction(org.springframework.binding.expression.Expression expression, ActionResultExposer evaluationResultExposer)
Create a new evaluate action.

Method Summary

protected Event	doExecute(RequestContext context) Template hook method subclasses should override to encapsulate their specific action execution logic.
protected org.springframework.binding.expression.EvaluationContext	getEvaluationContext(RequestContext context) Template method subclasses may override to customize the expressin evaluation context.

Methods inherited from class org.springframework.webflow.action.AbstractAction

afterPropertiesSet, doPostExecute, doPreExecute, error, error, execute, getActionNameForLogging, getEventFactorySupport, initAction, no, result, result, result, result, success, success, yes

Methods inherited from class java.lang.Object

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

Constructor Detail

EvaluateAction

public EvaluateAction(org.springframework.binding.expression.Expression expression)

Create a new evaluate action.

Parameters:

expression - the expression to evaluate

EvaluateAction

public EvaluateAction(org.springframework.binding.expression.Expression expression,
                      ActionResultExposer evaluationResultExposer)

Create a new evaluate action.

Parameters:

expression - the expression to evaluate

evaluationResultExposer - the strategy for how the expression result will be exposed to the flow

Method Detail

doExecute

protected Event doExecute(RequestContext context)
                   throws java.lang.Exception

Description copied from class: AbstractAction

Template hook method subclasses should override to encapsulate their specific action execution logic.

Specified by:

doExecute in class AbstractAction

Parameters:

context - the action execution context, for accessing and setting data in "flow scope" or "request scope"

Returns:

the action result event

Throws:

java.lang.Exception - an unrecoverable exception occured, either checked or unchecked

getEvaluationContext

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

Template method subclasses may override to customize the expressin evaluation context. This implementation returns null.

Parameters:

context - the request context

Returns:

the evaluation context