Add solutions to exercise lecture 6

foreksempel/src/main/java/of6/delegation/lf/CallCenter.java

+package of6.delegation.kode;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CallCenter implements CallRecipient {
+
+    private List<Employee> employees = new ArrayList<>();
+
+    public void addEmployee(Employee employee) {
+        if (!employees.contains(employee)) {
+            employees.add(employee);
+        }
+    }
+
+    public Employee getEmployeeForTask(String role) {
+        return employees.stream()
+                .filter(employee -> employee.getRole().equals(role))
+                .min((employee1, employee2) -> employee1.getNumberOfCallsAnswered()
+                        - employee2.getNumberOfCallsAnswered())
+                .get();
+    }
+
+    @Override
+    public void answerCall(String call) {
+        String role = switch (call) {
+            case "spørsmål", "klage" -> "Junior";
+            case "eskalering" -> "Teamleder";
+            case "intern" -> "HR";
+            default -> "Junior";
+        };
+        getEmployeeForTask(role).answerCall(call);
+    }
+
+    public static void main(String[] args) {
+        CallCenter callCenter = new CallCenter();
+        List<Employee> employeeList = List.of(
+                new Employee("Børge", "Teamleder"),
+                new Employee("Magnus", "Junior"),
+                new Employee("Nora", "Junior"),
+                new Employee("Jostein", "Junior"),
+                new Employee("Mattias", "Teamleder"),
+                new Employee("Eirik", "HR"));
+        employeeList.forEach(employee -> callCenter.addEmployee(employee));
+
+        callCenter.answerCall("klage");
+        callCenter.answerCall("klage");
+        callCenter.answerCall("internt");
+        callCenter.answerCall("eskalering");
+        callCenter.answerCall("spørsmål");
+        callCenter.answerCall("klage");
+        callCenter.answerCall("eskalering");
+        callCenter.answerCall("spørsmål");
+        callCenter.answerCall("spørsmål");
+        employeeList.forEach(
+                employee -> System.out.println(employee.getName() + " " + employee.getNumberOfCallsAnswered()));
+    }
+
+}

foreksempel/src/main/java/of6/delegation/lf/CallRecipient.java

+package of6.delegation.kode;
+
+public interface CallRecipient {
+
+    void answerCall(String call);
+
+}

foreksempel/src/main/java/of6/delegation/lf/Employee.java

+package of6.delegation.kode;
+
+public class Employee implements CallRecipient {
+
+	private String name;
+	private String role;
+	private int numberOfCallsAnswered = 0;
+
+	public Employee(String name, String role) {
+		this.name = name;
+		this.role = role;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public String getRole() {
+		return role;
+	}
+
+	public int getNumberOfCallsAnswered() {
+		return numberOfCallsAnswered;
+	}
+
+	@Override
+	public void answerCall(String call) {
+		System.out.println(name + " [" + role + "] answered call: " + call);
+		numberOfCallsAnswered++;
+	}
+
+}

foreksempel/src/main/java/of6/delegation/lf/Oppgave4.txt

+public static void main(String[] args) {
+    CallCenter callCenter = new CallCenter();
+    List<Employee> employeeList = List.of(
+            new Employee("Børge", "Teamleder"),
+            new Employee("Magnus", "Junior"),
+            new Employee("Nora", "Junior"),
+            new Employee("Jostein", "Junior"),
+            new Employee("Mattias", "Teamleder"),
+            new Employee("Eirik", "HR"));
+    employeeList.forEach(employee -> callCenter.addEmployee(employee));
+
+    callCenter.answerCall("klage");
+    callCenter.answerCall("klage");
+    callCenter.answerCall("internt");
+    callCenter.answerCall("eskalering");
+    callCenter.answerCall("spørsmål");
+    callCenter.answerCall("klage");
+    callCenter.answerCall("eskalering");
+    callCenter.answerCall("spørsmål");
+    callCenter.answerCall("spørsmål");
+    employeeList.forEach(
+            employee -> System.out.println(employee.getName() + " " + employee.getNumberOfCallsAnswered()));
+}
\ No newline at end of file

foreksempel/src/main/java/of6/observable/lf/App.java

+package of6.observable.kode;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class App {
+
+    private List<AppListener> clients = new ArrayList<>();
+    private List<String> sentPushNotifications = new ArrayList<>();
+
+    public void sendPushNotification(String notification) {
+        sentPushNotifications.add(notification);
+        firePushNotification(notification);
+    }
+
+    public void subscribe(AppListener listener) {
+        if (!clients.contains(listener)) {
+            clients.add(listener);
+        }
+    }
+
+    public void unsubscribe(AppListener listener) {
+        if (clients.contains(listener)) {
+            clients.remove(listener);
+        }
+    }
+
+    private void firePushNotification(String notification) {
+        for (AppListener appListener : clients) {
+            appListener.receivePushNotification(notification);
+        }
+    }
+
+}

foreksempel/src/main/java/of6/observable/lf/AppListener.java

+package of6.observable.kode;
+
+public interface AppListener {
+
+    void receivePushNotification(String notification);
+
+}

foreksempel/src/main/java/of6/observable/lf/Oppgave5.txt

+public static void main(String[] args) {
+    Phone iPhone11Pro = new Phone("Magnus sin iPhone");
+    Phone SamsungGalaxy = new Phone("Kjetils Android");
+    App OOPmini = new App();
+    App OOPbank = new App();
+    iPhone11Pro.install(OOPmini);
+    iPhone11Pro.install(OOPbank);
+    SamsungGalaxy.install(OOPmini);
+
+    OOPmini.sendPushNotification("Nå har vi 40% rabatt på Hummus!");
+    System.out.println(iPhone11Pro.printPushNotifications());
+    System.out.println();
+    System.out.println(SamsungGalaxy.printPushNotifications());
+    System.out.println();
+    OOPbank.sendPushNotification("Søk om høyere kredittgrense idag!");
+    System.out.println(iPhone11Pro.printPushNotifications());
+    System.out.println();
+    System.out.println(SamsungGalaxy.printPushNotifications());
+}

foreksempel/src/main/java/of6/observable/lf/Phone.java

+package of6.observable.kode;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.BinaryOperator;
+
+public class Phone implements AppListener {
+
+    private String name;
+    private List<String> notificationFeed = new ArrayList<>();
+    private List<App> installedApps = new ArrayList<>();
+
+    public Phone(String name) {
+        this.name = name;
+    }
+
+    public void install(App app) {
+        if (!installedApps.contains(app)) {
+            app.subscribe(this);
+            installedApps.add(app);
+        }
+    }
+
+    public void uninstall(App app) {
+        if (installedApps.contains(app)) {
+            app.unsubscribe(this);
+            installedApps.remove(app);
+        }
+    }
+
+    @Override
+    public void receivePushNotification(String notification) {
+        notificationFeed.add(notification);
+    }
+
+    public String printPushNotifications() {
+        return name + ":\n" + String.join("\n", notificationFeed);
+    }
+
+    public static void main(String[] args) {
+        Phone iPhone11Pro = new Phone("Magnus sin iPhone");
+        Phone SamsungGalaxy = new Phone("Kjetils Android");
+        App OOPmini = new App();
+        App OOPbank = new App();
+        iPhone11Pro.install(OOPmini);
+        iPhone11Pro.install(OOPbank);
+        SamsungGalaxy.install(OOPmini);
+
+        OOPmini.sendPushNotification("Nå har vi 40% rabatt på Hummus!");
+        System.out.println(iPhone11Pro.printPushNotifications());
+        System.out.println();
+        System.out.println(SamsungGalaxy.printPushNotifications());
+        System.out.println();
+        OOPbank.sendPushNotification("Søk om høyere kredittgrense idag!");
+        System.out.println(iPhone11Pro.printPushNotifications());
+        System.out.println();
+        System.out.println(SamsungGalaxy.printPushNotifications());
+
+        BinaryOperator<Double> op = (a, b) -> a + b;
+    }
+
+}