Lab 7 - Safe Home Access

Exercise 1 - Java implementation

Implement a safe home access Java application based on the diagram above. Consider the following functional requirements in implementing your program:

1. If the pin is wrong enterPin method shall throw an InvalidPinException.
2. If 3 consecutive fail attempts are made to enter the pin then door is locked(until master key pin is used) and enterPin method shall throw TooManyAttemptsException. Any further invocations of the enterPin method will throw TooManyAttemptsException.
3. If the master key pin is used, the door will be unlocked and retries count will be reset to 0.
4. If the pin is correct, the door shall be opened or closed depending on the current state (if open it will be closed, if closed it will be opened)
5. When the tenant already exists (verify the name), addTenant method will throw TenantAlreadyExistsException.
6. When the tenant is not found, removeTenant method will throw TenantNotFoundException.
7. All attempts (successful or not) will be logged in access log list.
8. A console based user interface should be implemented for the above system. The first promt should allow the selection of the user type, Admin or Tenant. The Tenant should only be able to enter the pin in order to open/close the door. The Admin should be able to add and to remove tenants, and to view the acess logs.

NOTE - The Java project comes with predefined unit tests. You should make sure all tests pass. You are not allowed to change unit tests (except for the initialisation of Controller object in the instantiateDoorController() method).

Exercise 2 - Sequence diagram(s)

Create the UML sequence diagram for the Safe Home Access application. The entities that should appear in the diagram(s) are:

1. The two user types, each with its own operations.
2. The Door Lock Controller.
3. The Door.
4. The Access Log.