/// <summary>
/// Gets the current <see cref="WorkflowExecutionFrame"/> for the specified
/// <see cref="IWorkflowSubject"/>.
/// </summary>
/// <param name="workflowSubject">
/// Workflow subject to get execution frame for.
/// </param>
/// <param name="serviceProvider">
/// Interface to service provider.
/// </param>
/// <returns>
/// A <see cref="WorkflowExecutionFrame"/> object containing the current workflow execution
/// state information for the specified <see cref="IWorkflowSubject"/>.
/// objects.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown when workflowSubject is null.
/// </exception>
/// <exception cref="StateNotFoundException">
/// Thrown when the current state of the workflow subject cannot be
/// found in the workflow.
/// </exception>
public WorkflowExecutionFrame GetExecutionFrame(IWorkflowSubject workflowSubject, IServiceProvider serviceProvider)
{
///////////////////////////////////////////////////////////////////
// Check arguments
if (workflowSubject == null)
{
throw new ArgumentNullException("workflowSubject");
}
///////////////////////////////////////////////////////////////////
// Get the CURRENT state
var currentStateName = workflowSubject.CurrentState;
if (string.IsNullOrEmpty(currentStateName))
{
throw new StateNotFoundException(this, currentStateName);
}
var currentState = this.FindStateByName(currentStateName);
if (currentState == null)
{
throw new StateNotFoundException(this, currentStateName);
}
var nextTransitions = currentState.Transitions.Select(t => new WorkflowTransitionDescriptor()
{
TransitionName = t.Name,
IsAllowed = t.IsAllowed(serviceProvider, workflowSubject.GetContextObject(serviceProvider))
});
return(WorkflowExecutionFrame.Create(workflowSubject, nextTransitions.ToList()));
}
internal static WorkflowExecutionFrame Create(IWorkflowSubject subject,
IEnumerable <WorkflowTransitionDescriptor> nextTransitions)
{
var workflowExecutionFrame = new WorkflowExecutionFrame()
{
Subject = subject,
NextTransitions = nextTransitions
};
return(workflowExecutionFrame);
}