org.apache.lenya.workflow.impl
Class WorkflowInstanceImpl

java.lang.Object
  org.apache.lenya.workflow.impl.WorkflowInstanceImpl

All Implemented Interfaces:

WorkflowInstance

Direct Known Subclasses:

WorkflowDocument

public abstract class WorkflowInstanceImpl
extends java.lang.Object
implements WorkflowInstance

Implementation of a workflow instance.

Constructor Summary

protected

WorkflowInstanceImpl() Creates a new instance of WorkflowInstanceImpl.

Method Summary

void	addWorkflowListener(WorkflowListener listener) Adds a workflow listener.
protected void	fire(TransitionImpl transition) Invokes a transition.
State	getCurrentState() Returns the current state of this WorkflowInstance.
Event[]	getExecutableEvents(Situation situation) Returns the events that can be invoked in a certain situation.
protected TransitionImpl	getNextTransition(Event event) Returns the transition that would fire for a given event.
protected State	getState(java.lang.String id) Returns a workflow state for a given name.
boolean	getValue(java.lang.String variableName) Returns the current value of a variable.
protected BooleanVariableInstance	getVariableInstance(BooleanVariable variable) Returns the corresponding instance of a workflow variable.
Workflow	getWorkflow() Returns the workflow object of this instance.
protected abstract WorkflowImpl	getWorkflow(java.lang.String workflowName) Factory method to create a workflow object for a given identifier.
protected WorkflowImpl	getWorkflowImpl() Returns the workflow object of this instance.
protected void	initVariableInstances() Initializes the variable instances in the initial state.
void	invoke(Situation situation, Event event) Invoke an event on this workflow instance.
boolean	isSynchronized(Event event) Returns if the transition for a certain event is synchronized.
void	removeWorkflowListener(WorkflowListener listener) Removes a workflow listener.
protected void	setCurrentState(State state) Sets the current state of this instance.
protected void	setValue(java.lang.String variableName, boolean value) Sets the value of a state variable.
protected void	setWorkflow(java.lang.String workflowName) Sets the workflow of this instance.
protected void	setWorkflow(WorkflowImpl workflow) Sets the workflow of this instance.

Methods inherited from class java.lang.Object

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

Constructor Detail

WorkflowInstanceImpl

protected WorkflowInstanceImpl()

Creates a new instance of WorkflowInstanceImpl.

Method Detail

getWorkflow

public Workflow getWorkflow()

Returns the workflow object of this instance.

Specified by:

getWorkflow in interface WorkflowInstance

Returns:

A workflow object.

getWorkflowImpl

protected WorkflowImpl getWorkflowImpl()

Returns the workflow object of this instance.

Returns:

A workflow object.

getExecutableEvents

public Event[] getExecutableEvents(Situation situation)
                            throws WorkflowException

Returns the events that can be invoked in a certain situation.

Specified by:

getExecutableEvents in interface WorkflowInstance

Parameters:

situation - The situation to check.

Returns:

The events that can be invoked.

Throws:

WorkflowException - when something went wrong.

invoke

public void invoke(Situation situation,
                   Event event)
            throws WorkflowException

Invoke an event on this workflow instance.

Specified by:

invoke in interface WorkflowInstance

Parameters:

situation - The situation when the event was invoked.

event - The event that was invoked.

Throws:

WorkflowException - when the event may not be invoked.

getNextTransition

protected TransitionImpl getNextTransition(Event event)
                                    throws WorkflowException

Returns the transition that would fire for a given event.

Parameters:

event - The event.

Returns:

A transition.

Throws:

WorkflowException - if no single transition would fire.

fire

protected void fire(TransitionImpl transition)
             throws WorkflowException

Invokes a transition.

Parameters:

transition - The transition to invoke.

Throws:

WorkflowException - if something goes wrong.

setCurrentState

protected void setCurrentState(State state)

Sets the current state of this instance.

Parameters:

state - The state to set.

getCurrentState

public State getCurrentState()

Returns the current state of this WorkflowInstance.

Specified by:

getCurrentState in interface WorkflowInstance

Returns:

A state object.

setWorkflow

protected void setWorkflow(WorkflowImpl workflow)

Sets the workflow of this instance.

Parameters:

workflow - A workflow object.

setWorkflow

protected void setWorkflow(java.lang.String workflowName)
                    throws WorkflowException

Sets the workflow of this instance.

Parameters:

workflowName - The identifier of the workflow.

Throws:

WorkflowException - if something goes wrong.

getWorkflow

protected abstract WorkflowImpl getWorkflow(java.lang.String workflowName)
                                     throws WorkflowException

Factory method to create a workflow object for a given identifier.

Parameters:

workflowName - The workflow identifier.

Returns:

A workflow object.

Throws:

WorkflowException - when the workflow could not be created.

getState

protected State getState(java.lang.String id)
                  throws WorkflowException

Returns a workflow state for a given name.

Parameters:

id - The state id.

Returns:

A workflow object.

Throws:

WorkflowException - when the state was not found.

initVariableInstances

protected void initVariableInstances()

Initializes the variable instances in the initial state.

getVariableInstance

protected BooleanVariableInstance getVariableInstance(BooleanVariable variable)
                                               throws WorkflowException

Returns the corresponding instance of a workflow variable.

Parameters:

variable - A variable of the corresponding workflow.

Returns:

A variable instance object.

Throws:

WorkflowException - when the variable instance was not found.

getValue

public boolean getValue(java.lang.String variableName)
                 throws WorkflowException

Description copied from interface: WorkflowInstance

Returns the current value of a variable.

Specified by:

getValue in interface WorkflowInstance

Parameters:

variableName - A variable name.

Returns:

A boolean value.

Throws:

WorkflowException - when the variable does not exist.

See Also:

WorkflowInstance.getValue(java.lang.String)

setValue

protected void setValue(java.lang.String variableName,
                        boolean value)
                 throws WorkflowException

Sets the value of a state variable.

Parameters:

variableName - The variable name.

value - The value to set.

Throws:

WorkflowException - when the variable was not found.

addWorkflowListener

public void addWorkflowListener(WorkflowListener listener)

Description copied from interface: WorkflowInstance

Adds a workflow listener.

Specified by:

addWorkflowListener in interface WorkflowInstance

Parameters:

listener - The listener to add.

See Also:

WorkflowInstance.addWorkflowListener(org.apache.lenya.workflow.WorkflowListener)

removeWorkflowListener

public void removeWorkflowListener(WorkflowListener listener)

Description copied from interface: WorkflowInstance

Removes a workflow listener.

Specified by:

removeWorkflowListener in interface WorkflowInstance

Parameters:

listener - The listener to remove.

See Also:

WorkflowInstance.removeWorkflowListener(org.apache.lenya.workflow.WorkflowListener)

isSynchronized

public boolean isSynchronized(Event event)
                       throws WorkflowException

Description copied from interface: WorkflowInstance

Returns if the transition for a certain event is synchronized.

Specified by:

isSynchronized in interface WorkflowInstance

Parameters:

event - An event.

Returns:

A boolean value.

Throws:

WorkflowException

See Also:

WorkflowInstance.isSynchronized(org.apache.lenya.workflow.Event)