added lab7 ex2

src/lab7_state/ex2/Main.java

@@ -0,0 +1,25 @@
+package lab7_state.ex2;
+
+public class Main {
+    public static void main(String[] args) {
+        User user = new User("Baryhobal");
+        user.connect();
+        user.enter();
+        user.leave();
+
+        user.enter();
+        user.ask();
+        user.leave();
+
+        user.enter();
+        user.ask();
+        user.handOver();
+        user.leave();
+
+        user.enter();
+        user.ask();
+        user.handOver();
+        user.over();
+        user.leave();
+    }
+}

src/lab7_state/ex2/User.java

@@ -0,0 +1,71 @@
+package lab7_state.ex2;
+
+import lab7_state.ex2.states.*;
+
+public class User {
+    private String name;
+    private UserState currentState;
+    private UserState unregisteredState;
+    private UserState registeredState;
+    private UserState inMeetingState;
+    private UserState waitingToSpeakState;
+    private UserState speakingState;
+
+    public User(String name) {
+        this.name = name;
+        unregisteredState = new UnregisteredState(this);
+        registeredState = new RegisteredState(this);
+        inMeetingState = new InMeetingState(this);
+        waitingToSpeakState = new WaitingToSpeakState(this);
+        speakingState = new SpeakingState(this);
+        currentState = unregisteredState;
+    }
+
+    public void setCurrentState(UserState currentState) {
+        this.currentState = currentState;
+    }
+
+    public UserState getUnregisteredState() {
+        return unregisteredState;
+    }
+
+    public UserState getRegisteredState() {
+        return registeredState;
+    }
+
+    public UserState getInMeetingState() {
+        return inMeetingState;
+    }
+
+    public UserState getWaitingToSpeakState() {
+        return waitingToSpeakState;
+    }
+
+    public UserState getSpeakingState() {
+        return speakingState;
+    }
+
+    public void connect() {
+        currentState.connect();
+    }
+    public void enter() {
+        currentState.enter();
+    }
+    public void leave() {
+        currentState.leave();
+    }
+    public void ask() {
+        currentState.ask();
+    }
+    public void handOver() {
+        currentState.handOver();
+    }
+    public void over() {
+        currentState.over();
+    }
+
+    @Override
+    public String toString() {
+        return "User " + name;
+    }
+}

src/lab7_state/ex2/UserState.java

@@ -0,0 +1,18 @@
+package lab7_state.ex2;
+
+public abstract class UserState {
+    protected User user;
+    public UserState(User user) {
+        this.user = user;
+    }
+    protected void log(String msg) {
+        System.out.println("[" + user + "] " + msg);
+    }
+
+    public void connect() {};
+    public void enter() {};
+    public void leave() {};
+    public void ask() {};
+    public void handOver() {};
+    public void over() {};
+}

src/lab7_state/ex2/states/InMeetingState.java

@@ -0,0 +1,22 @@
+package lab7_state.ex2.states;
+
+import lab7_state.ex2.User;
+import lab7_state.ex2.UserState;
+
+public class InMeetingState extends UserState {
+    public InMeetingState(User user) {
+        super(user);
+    }
+
+    @Override
+    public void leave() {
+        user.setCurrentState(user.getRegisteredState());
+        log("Left meeting");
+    }
+
+    @Override
+    public void ask() {
+        user.setCurrentState(user.getWaitingToSpeakState());
+        log("Asking to speak");
+    }
+}

src/lab7_state/ex2/states/RegisteredState.java

@@ -0,0 +1,16 @@
+package lab7_state.ex2.states;
+
+import lab7_state.ex2.User;
+import lab7_state.ex2.UserState;
+
+public class RegisteredState extends UserState {
+    public RegisteredState(User user) {
+        super(user);
+    }
+
+    @Override
+    public void enter() {
+        user.setCurrentState(user.getInMeetingState());
+        log("Entered meeting");
+    }
+}

src/lab7_state/ex2/states/SpeakingState.java

@@ -0,0 +1,22 @@
+package lab7_state.ex2.states;
+
+import lab7_state.ex2.User;
+import lab7_state.ex2.UserState;
+
+public class SpeakingState extends UserState {
+    public SpeakingState(User user) {
+        super(user);
+    }
+
+    @Override
+    public void over() {
+        user.setCurrentState(user.getInMeetingState());
+        log("Finished speaking");
+    }
+
+    @Override
+    public void leave() {
+        user.setCurrentState(user.getRegisteredState());
+        log("Finished speaking, left meeting");
+    }
+}

src/lab7_state/ex2/states/UnregisteredState.java

@@ -0,0 +1,16 @@
+package lab7_state.ex2.states;
+
+import lab7_state.ex2.User;
+import lab7_state.ex2.UserState;
+
+public class UnregisteredState extends UserState {
+    public UnregisteredState(User user) {
+        super(user);
+    }
+
+    @Override
+    public void connect() {
+        user.setCurrentState(user.getRegisteredState());
+        log("Registered");
+    }
+}

src/lab7_state/ex2/states/WaitingToSpeakState.java

@@ -0,0 +1,22 @@
+package lab7_state.ex2.states;
+
+import lab7_state.ex2.User;
+import lab7_state.ex2.UserState;
+
+public class WaitingToSpeakState extends UserState {
+    public WaitingToSpeakState(User user) {
+        super(user);
+    }
+
+    @Override
+    public void leave() {
+        user.setCurrentState(user.getRegisteredState());
+        log("Lost patience, left meeting");
+    }
+
+    @Override
+    public void handOver() {
+        user.setCurrentState(user.getSpeakingState());
+        log("Starts speaking");
+    }
+}