// in this function we will check if this employee can
// process or some other action is needed
void HR_onLeaveApplied(Employee e, Leave l)
{
// check if we can process this request
if (l.NumberOfDays < MAX_LEAVES_CAN_APPROVE)
{
// process it on our level only
ApproveLeave(l);
}
else
{
// if we cant process pass on to the supervisor
// so that he can process
if (Supervisor != null)
{
Supervisor.LeaveApplied(this, l);
}
else
{
// There is no one up in hierarchy so lets
// tell the user what he needs to do now
Console.WriteLine("Leave application suspended, Please contact HR");
}
}
}
// If we can process lets show the output
public override void ApproveLeave(Leave leave)
{
Console.WriteLine("LeaveID: {0} Days: {1} Approver: {2}", leave.LeaveId, leave.NumberOfDays, "HR");
}
// This is the function which concrete handlers will use to take // action, if they are able to take actions. public abstract void ApproveLeave(Leave leave);
// Using this we can apply for leave
public void ApplyLeave(Leave leave)
{
LeaveApplied(this, leave);
}
// This will invoke events when the leave will be applied
// i.e. the actual item will be handed over to the hierarchy of
// concrete handlers.
public void LeaveApplied(Employee employee, Leave leave)
{
onLeaveApplied?.Invoke(this, leave);
}