Package 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 ResultEventFactory to determine how to map the evaluation result to an action outcome Event.

Author:

Keith Donald, Jeremy Grelle

See Also:

• Expression
• ResultEventFactory

Field Summary

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

logger

Constructor Summary

Constructors

Constructor	Description
EvaluateAction(Expression expression, Expression resultExpression)	Create a new evaluate action.
EvaluateAction(Expression expression, Expression resultExpression, ResultEventFactory resultEventFactory)	Create a new evaluate action.

Method Summary

Modifier and Type	Method	Description
protected Event	doExecute(RequestContext context)	Template hook method subclasses should override to encapsulate their specific action execution logic.
String	toString()

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, wait, wait, wait

Constructor Details

EvaluateAction

public EvaluateAction(Expression expression,
 Expression resultExpression)

Create a new evaluate action.

Parameters:

expression - the expression to evaluate (required)

resultExpression - the expression to evaluate the result (optional)

EvaluateAction

public EvaluateAction(Expression expression,
 Expression resultExpression,
 ResultEventFactory resultEventFactory)

Create a new evaluate action.

Parameters:

expression - the expression to evaluate (required)

resultExpression - the strategy for how the expression result will be exposed to the flow (optional)

resultEventFactory - the factory that will map the evaluation result to a Web Flow event (optional)

Method Details

doExecute

protected Event doExecute(RequestContext context)
                   throws 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:

Exception - an unrecoverable exception occured, either checked or unchecked

toString

public String toString()

Overrides:

toString in class Object