Package org.springframework.webflow.engine

Class TransitionableState

java.lang.Object

org.springframework.webflow.core.AnnotatedObject

org.springframework.webflow.engine.State

org.springframework.webflow.engine.TransitionableState

All Implemented Interfaces:

Annotated, StateDefinition, TransitionableStateDefinition

Direct Known Subclasses:

ActionState, DecisionState, SubflowState, ViewState

public abstract class TransitionableState
extends State
implements TransitionableStateDefinition

Abstract superclass for states that can execute a transition in response to an event.

Author:

Keith Donald, Erwin Vervaet

See Also:

• Transition
• TransitionCriteria

Field Summary

Fields inherited from class org.springframework.webflow.engine.State

logger

Fields inherited from class org.springframework.webflow.core.AnnotatedObject

CAPTION_PROPERTY, DESCRIPTION_PROPERTY

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	TransitionableState(Flow flow, String id)	Create a new transitionable state.

Method Summary

Modifier and Type	Method	Description
protected void	appendToString(org.springframework.core.style.ToStringCreator creator)	Subclasses may override this hook method to print their internal state to a string.
void	exit(RequestControlContext context)	Exit this state.
ActionList	getExitActionList()	Returns the list of actions executed by this state when it is exited.
Transition	getRequiredTransition(RequestContext context)	Get a transition in this state for given flow execution request context.
TransitionDefinition	getTransition(String eventId)	Returns the transition that matches the event with the provided id.
TransitionDefinition[]	getTransitions()	Returns the available transitions out of this state.
TransitionSet	getTransitionSet()	Returns the set of transitions.
boolean	handleEvent(RequestControlContext context)	Inform this state definition that an event was signaled in it.

Methods inherited from class org.springframework.webflow.engine.State

doEnter, doPreEntryActions, enter, equals, getEntryActionList, getExceptionHandlerSet, getFlow, getId, getOwner, handleException, hashCode, isStartState, isViewState, toString

Methods inherited from class org.springframework.webflow.core.AnnotatedObject

getAttributes, getCaption, getDescription, setCaption, setDescription

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.springframework.webflow.core.Annotated

getAttributes, getCaption, getDescription

Methods inherited from interface org.springframework.webflow.definition.StateDefinition

getId, getOwner, isViewState

Constructor Details

TransitionableState

protected TransitionableState(Flow flow,
 String id)
                       throws IllegalArgumentException

Create a new transitionable state.

Parameters:

flow - the owning flow

id - the state identifier (must be unique to the flow)

Throws:

IllegalArgumentException - when this state cannot be added to given flow, for instance when the id is not unique

See Also:

• State(Flow, String)
• getTransitionSet()

Method Details

getTransitions

public TransitionDefinition[] getTransitions()

Description copied from interface: TransitionableStateDefinition

Returns the available transitions out of this state.

Specified by:

getTransitions in interface TransitionableStateDefinition

Returns:

the available state transitions

getTransition

public TransitionDefinition getTransition(String eventId)

Description copied from interface: TransitionableStateDefinition

Returns the transition that matches the event with the provided id.

Specified by:

getTransition in interface TransitionableStateDefinition

Parameters:

eventId - the event id

Returns:

the transition that matches, or null if no match is found.

getTransitionSet

public TransitionSet getTransitionSet()

Returns the set of transitions. The returned set is mutable.

getRequiredTransition

public Transition getRequiredTransition(RequestContext context)
                                 throws NoMatchingTransitionException

Get a transition in this state for given flow execution request context. Throws and exception when there is no corresponding transition.

Throws:

NoMatchingTransitionException - when a matching transition cannot be found

getExitActionList

public ActionList getExitActionList()

Returns the list of actions executed by this state when it is exited. The returned list is mutable.

Returns:

the state exit action list

handleEvent

public boolean handleEvent(RequestControlContext context)
                    throws NoMatchingTransitionException

Inform this state definition that an event was signaled in it. The signaled event is the last event available in given request context (RequestContext.getCurrentEvent()).

Parameters:

context - the flow execution control context

Throws:

NoMatchingTransitionException - when a matching transition cannot be found

exit

public void exit(RequestControlContext context)

Exit this state. This is typically called when a transition takes the flow out of this state into another state. By default just executes any registered exit actions.

Parameters:

context - the flow control context

appendToString

protected void appendToString(org.springframework.core.style.ToStringCreator creator)

Description copied from class: State

Subclasses may override this hook method to print their internal state to a string. This default implementation does nothing.

Overrides:

appendToString in class State

Parameters:

creator - the toString creator, to print properties to string

See Also:

• State.toString()