Package org.springframework.webflow.engine

Class SubflowState

java.lang.Object

org.springframework.webflow.core.AnnotatedObject

org.springframework.webflow.engine.State

org.springframework.webflow.engine.TransitionableState

org.springframework.webflow.engine.SubflowState

All Implemented Interfaces:

Annotated, StateDefinition, TransitionableStateDefinition

public class SubflowState
extends TransitionableState

A transitionable state that spawns a subflow when executed. When the subflow this state spawns ends, the ending result is used as grounds for a state transition out of this state.

A subflow state may be configured to map input data from its flow -- acting as the parent flow -- down to the subflow when the subflow is spawned. In addition, output data produced by the subflow may be mapped up to the parent flow when the subflow ends and the parent flow resumes. See the SubflowAttributeMapper interface definition for more information on how to do this. The logic for ending a subflow is located in the EndState implementation.

Author:

Keith Donald, Erwin Vervaet

See Also:

• SubflowAttributeMapper
• EndState

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

Constructor	Description
SubflowState(Flow flow, String id, Expression subflow)	Create a new subflow 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.
protected void	doEnter(RequestControlContext context)	Specialization of State's doEnter template method that executes behaviour specific to this state type in polymorphic fashion.
boolean	handleEvent(RequestControlContext context)	Called on completion of the subflow to handle the subflow result event as determined by the end state reached by the subflow.
void	setAttributeMapper(SubflowAttributeMapper attributeMapper)	Set the attribute mapper used to map model data between the parent and child flow.

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

exit, getExitActionList, getRequiredTransition, getTransition, getTransitions, getTransitionSet

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

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

SubflowState

public SubflowState(Flow flow,
 String id,
 Expression subflow)
             throws IllegalArgumentException

Create a new subflow state.

Parameters:

flow - the owning flow

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

subflow - the subflow to spawn

Throws:

IllegalArgumentException - when this state cannot be added to given flow, e.g. because the id is not unique

See Also:

• setAttributeMapper(SubflowAttributeMapper)

Method Details

setAttributeMapper

public void setAttributeMapper(SubflowAttributeMapper attributeMapper)

Set the attribute mapper used to map model data between the parent and child flow.

doEnter

protected void doEnter(RequestControlContext context)
                throws FlowExecutionException

Specialization of State's doEnter template method that executes behaviour specific to this state type in polymorphic fashion.

Entering this state, creates the subflow input map and spawns the subflow in the current flow execution.

Specified by:

doEnter in class State

Parameters:

context - the control context for the currently executing flow, used by this state to manipulate the flow execution

Throws:

FlowExecutionException - if an exception occurs in this state

handleEvent

public boolean handleEvent(RequestControlContext context)

Called on completion of the subflow to handle the subflow result event as determined by the end state reached by the subflow.

Overrides:

handleEvent in class TransitionableState

Parameters:

context - the flow execution 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 TransitionableState

Parameters:

creator - the toString creator, to print properties to string

See Also:

• State.toString()