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org.apache.lenya.workflow
Interface WorkflowInstance

All Known Implementing Classes:

WorkflowDocument, WorkflowInstanceImpl

public interface WorkflowInstance

A workflow instance is an incarnation of a workflow schema. It consists of

• a current state,
• a mapping which assigns values to all state variables.

Method Summary

void	addWorkflowListener(WorkflowListener listener) Adds a workflow listener.
State	getCurrentState() Returns the current state of this WorkflowInstance.
Event[]	getExecutableEvents(Situation situation) Returns the executable events in a certain situation.
boolean	getValue(java.lang.String variableName) Returns the current value of a variable.
Workflow	getWorkflow() Returns the workflow this instance belongs to.
void	invoke(Situation situation, Event event) Indicates that the user invoked an event.
boolean	isSynchronized(Event event) Returns if the transition for a certain event is synchronized.
void	removeWorkflowListener(WorkflowListener listener) Removes a workflow listener.

Method Detail

getWorkflow

Workflow getWorkflow()

Returns the workflow this instance belongs to.

Returns:

A Workflow object.

getCurrentState

State getCurrentState()

Returns the current state of this WorkflowInstance.

Returns:

the current state

getExecutableEvents

Event[] getExecutableEvents(Situation situation)
                            throws WorkflowException

Returns the executable events in a certain situation.

Parameters:

situation - The situation.

Returns:

An array of events.

Throws:

WorkflowException - when something went wrong.

invoke

void invoke(Situation situation,
            Event event)
            throws WorkflowException

Indicates that the user invoked an event.

Parameters:

situation - The situation in which the event was invoked.

event - The event that was invoked.

Throws:

WorkflowException - when something went wrong.

getValue

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

Returns the current value of a variable.

Parameters:

variableName - A variable name.

Returns:

A boolean value.

Throws:

WorkflowException - when the variable does not exist.

addWorkflowListener

void addWorkflowListener(WorkflowListener listener)

Adds a workflow listener.

Parameters:

listener - The listener to add.

removeWorkflowListener

void removeWorkflowListener(WorkflowListener listener)

Removes a workflow listener.

Parameters:

listener - The listener to remove.

isSynchronized

boolean isSynchronized(Event event)
                       throws WorkflowException

Returns if the transition for a certain event is synchronized.

Parameters:

event - An event.

Returns:

A boolean value.

Throws:

WorkflowException