Public MustInherit Class ActivityState
    Implements IActivityActions

    Public Activity As IActivity

    Protected Property CurrentEmployee As IEmployee

    ''' <summary>
    ''' The <see cref="ActivityStateEnum"/> for the current state.
    ''' </summary>
    ''' <returns></returns>
    Public MustOverride Function ActivityStateEnum() As ActivityStateEnum

    Public Overridable Function GetEmployee() As IEmployee
        Throw New Exception("No employee present.")
    End Function

    ''' <inheritdoc/>
    Public Overridable Sub StartActivity(employee As IEmployee) Implements IActivityActions.StartActivity
        Throw New Exception("Can't start the activity in this state.")
    End Sub

    ''' <inheritdoc/>
    Public Overridable Sub StopActivity() Implements IActivityActions.StopActivity
        Throw New Exception("Can't stop the activity in this state.")
    End Sub

    ''' <inheritdoc/>
    Public Overridable Sub FinishActivity() Implements IActivityActions.FinishActivity
        Throw New Exception("Can't finish the activity in this state.")
    End Sub
End Class