assignment 7

Prof. Dr. Stephan Kleuker
Hochschule Osnabrück
Fakultät Ing.-Wissenschaften und Informatik
- Software-Entwicklung -
Objektorientierte Analyse und Design
Sommersemester 2015
7. Aufgabenblatt
Task 16 (5 Points)
Sequence diagrams can be used to analyze existing programs in such a way that typical
sequences of method calls are visualized. The file aufgabe16.zip from the web site of this
lectures contains such an existing program.
a) Use the code to derive a complete class diagram for this program.
b) Draw one detailed sequence diagram showing the input from and the output to the user
and all method calls with the visibility public for the following actions. The user starts
the program. The user creates two controllers with different input texts. The user
creates a view with the output symbol #. The user uses the first controller to change
the value of the model to 7. The user creates a second view with the output symbol *.
The user uses the second controller to change the value of the model to 5. The user
terminates the program.
Your sequence diagram contains all existing objects of the classes Main, Model, View
and Controller, objects of collection type can be omitted.
The initial part of the diagram can look as follows.
Translation
User
…
Input: 2
Input: „Give Value“
You might remove the comment for the Line Locale.setDefault(new Locale("en","US"));
in the class Main.
Task 17 (5 Points)
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Prof. Dr. Stephan Kleuker
Hochschule Osnabrück
Fakultät Ing.-Wissenschaften und Informatik
- Software-Entwicklung -
Objektorientierte Analyse und Design
Sommersemester 2015
7. Aufgabenblatt
The previous class diagram shows the relevant classes of an access management
(Zugriffsverwaltung) for users with different privileges. The abstract class Nutzer (user)
contains the displayed instance variables, constructors and three abstract methods (UML:
cursive font). These methods can be used to check the privileges mentioned in their names
(darfDatenBearbeiten = canManageData, darfTabellenBearbeiten = canManageTables,
darfNutzerAnlegen, canCreateUsers). There are three realizations of the abstract class with
the following privileges. A system administrator (Systemadministrator) can do everything, a
project administrator (Projektadministrator) can manage tables and data, a developer
(Entwickler) can only manage data. Get- and set-Methods of the class user are omitted in the
diagram but exist.
The class Zugriffsverwaltung manages all users and assures that always only one user is
active (aktiverNutzer = activeUser).
The detailed specification of the class Zugriffsverwaltung looks like follows.
Field Summary
private
private
Nutzer aktuellerNutzer
active user with access to the- system, there is no active user at
the beginning.
List<Nutzer> nutzer
list of all existing users. [you are allowed to use a different
collection]
Constructor Summary
Zugriffsverwaltung()
creates an object containing an initial user, a system administrator with login and password
„admin“.
Method Summary
boolean authentifizieren(java.lang.String login,
java.lang.String passwort)
checks whether a user with the pair login and password exists, if this is the case
this user becomes the new active user. The result shows if the authentification was
successfull.
boolean entwicklerHinzufuegen(java.lang.String login,
java.lang.String passwort)
if the active user has the right to add new users, a developer with login and
password is added. The result shows if an object was added.
boolean loginAendern(java.lang.String altesLogin,
java.lang.String neuesLogin)
if the active user has the right to add new users, and a user with the old login
(altesLogin) exists, this login is changed to the new value (neuesLogin). The result
shows if an object was changed.
void nutzerAnzeigen()
shows all users with login, password and its detailed privileges.
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Prof. Dr. Stephan Kleuker
Hochschule Osnabrück
Fakultät Ing.-Wissenschaften und Informatik
- Software-Entwicklung -
Objektorientierte Analyse und Design
Sommersemester 2015
7. Aufgabenblatt
boolean passwortAendern(java.lang.String altesPasswort,
java.lang.String neuesPasswort)
if an active user exists and her password is the first parameter (altesPasswort) then
the password is changed to the new value (neuesPasswort). The result shows if a
password was changed.
boolean projektadministratorHinzufuegen(java.lang.String login,
java.lang.String passwort)
if the active user has the right to add new users, a project administrator with login
and password is added. The result shows if an object was added.
boolean systemadministratorHinzufuegen(java.lang.String login,
java.lang.String passwort)
if the active user has the right to add new users, a system administrator with login
and password is added. The result shows if an object was added.
Your task is to implement all classes of the diagram. Use the class Zugriffsdialog (access
dialog) from the web site of the lecture in the file aufgabe17.zip to test your implementation
manually. The program starts with the class Main.
You might remove the comment for the Line Locale.setDefault(new Locale("en","US")); in the
class Main.
This task does not contain all functionality that is necessary for a complete access system.
You are allowed to add functionality but it is not necessary.
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