org.springframework.webflow.engine.builder
Class TextToTransitionCriteria

java.lang.Object
  org.springframework.binding.convert.support.AbstractConverter
      org.springframework.webflow.engine.builder.TextToTransitionCriteria

All Implemented Interfaces:

org.springframework.binding.convert.Converter

public class TextToTransitionCriteria
extends org.springframework.binding.convert.support.AbstractConverter

Converter that takes an encoded string representation and produces a corresponding TransitionCriteria object.

This converter supports the following encoded forms:

• "*" - will result in a TransitionCriteria object that matches on everything (WildcardTransitionCriteria)
• "eventId" - will result in a TransitionCriteria object that matches given event id (EventIdTransitionCriteria)
• "${...}" - will result in a TransitionCriteria object that evaluates given condition, expressed as an expression (BooleanExpressionTransitionCriteria)
• "bean:<id>" - will result in usage of a custom TransitionCriteria bean implementation.

Author:

Keith Donald, Erwin Vervaet

See Also:

TransitionCriteria

Constructor Summary

TextToTransitionCriteria(FlowServiceLocator flowServiceLocator)
Create a new converter that converts strings to transition criteria objects.

Method Summary

protected TransitionCriteria	createBooleanExpressionTransitionCriteria(org.springframework.binding.expression.Expression expression) Hook method subclasses can override to return a specialized expression evaluating transition criteria implementation.
protected TransitionCriteria	createEventIdTransitionCriteria(java.lang.String eventId) Hook method subclasses can override to return a specialized eventId matching transition criteria implementation.
protected java.lang.Object	doConvert(java.lang.Object source, java.lang.Class targetClass, org.springframework.binding.convert.ConversionContext context)
java.lang.Class[]	getSourceClasses()
java.lang.Class[]	getTargetClasses()

Methods inherited from class org.springframework.binding.convert.support.AbstractConverter

convert, convert, convert, convert

Methods inherited from class java.lang.Object

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

Constructor Detail

TextToTransitionCriteria

public TextToTransitionCriteria(FlowServiceLocator flowServiceLocator)

Create a new converter that converts strings to transition criteria objects. Custom transition criteria will be looked up using given service locator.

Method Detail

getSourceClasses

public java.lang.Class[] getSourceClasses()

getTargetClasses

public java.lang.Class[] getTargetClasses()

doConvert

protected java.lang.Object doConvert(java.lang.Object source,
                                     java.lang.Class targetClass,
                                     org.springframework.binding.convert.ConversionContext context)
                              throws java.lang.Exception

Specified by:

doConvert in class org.springframework.binding.convert.support.AbstractConverter

Throws:

java.lang.Exception

createEventIdTransitionCriteria

protected TransitionCriteria createEventIdTransitionCriteria(java.lang.String eventId)
                                                      throws org.springframework.binding.convert.ConversionException

Hook method subclasses can override to return a specialized eventId matching transition criteria implementation.

Parameters:

eventId - the event id to match

Returns:

the transition criteria object

Throws:

org.springframework.binding.convert.ConversionException - when something goes wrong

createBooleanExpressionTransitionCriteria

protected TransitionCriteria createBooleanExpressionTransitionCriteria(org.springframework.binding.expression.Expression expression)
                                                                throws org.springframework.binding.convert.ConversionException

Hook method subclasses can override to return a specialized expression evaluating transition criteria implementation.

Parameters:

expression - the expression to evaluate

Returns:

the transition criteria object

Throws:

org.springframework.binding.convert.ConversionException - when something goes wrong