added lab9 ex1

src/lab7_state/ex2/User.java

@@ -3,13 +3,13 @@ package lab7_state.ex2;
 import lab7_state.ex2.states.*;
 
 public class User {
-    private String name;
+    private final String name;
     private UserState currentState;
-    private UserState unregisteredState;
+    private final UserState unregisteredState;
-    private UserState registeredState;
+    private final UserState registeredState;
-    private UserState inMeetingState;
+    private final UserState inMeetingState;
-    private UserState waitingToSpeakState;
+    private final UserState waitingToSpeakState;
-    private UserState speakingState;
+    private final UserState speakingState;
 
     public User(String name) {
         this.name = name;

src/lab9_responsibility_chain/ex1/Email.java

@@ -0,0 +1,9 @@
+package lab9_responsibility_chain.ex1;
+
+public record Email(String subject, EmailType type) {
+
+    @Override
+    public String toString() {
+        return "<" + type + " Email: '" + subject + "'>";
+    }
+}

src/lab9_responsibility_chain/ex1/EmailType.java

@@ -0,0 +1,8 @@
+package lab9_responsibility_chain.ex1;
+
+public enum EmailType {
+    SPAM,
+    FAN,
+    COMPLAINT,
+    NEW_LOC
+}

src/lab9_responsibility_chain/ex1/Handler.java

@@ -0,0 +1,11 @@
+package lab9_responsibility_chain.ex1;
+
+public abstract class Handler {
+    protected Handler successor;
+
+    public void setSuccessor(Handler successor) {
+        this.successor = successor;
+    }
+
+    public abstract void handleEmail(Email email);
+}

src/lab9_responsibility_chain/ex1/Main.java

@@ -0,0 +1,26 @@
+package lab9_responsibility_chain.ex1;
+
+import lab9_responsibility_chain.ex1.handlers.*;
+
+public class Main {
+    public static void main(String[] args) {
+        Handler spamHandler = new SpamHandler();
+        Handler fanHandler = new FanHandler();
+        Handler complaintHandler = new ComplaintHandler();
+        Handler newLocHandler = new NewLocHandler();
+
+        spamHandler.setSuccessor(fanHandler);
+        fanHandler.setSuccessor(complaintHandler);
+        complaintHandler.setSuccessor(newLocHandler);
+
+        Email email1 = new Email("You WON the LoTtErY !!!!!", EmailType.SPAM);
+        Email email2 = new Email("Your company is awesome !", EmailType.FAN);
+        Email email3 = new Email("My children are addicted :(", EmailType.COMPLAINT);
+        Email email4 = new Email("Please come to Sion :)", EmailType.NEW_LOC);
+
+        spamHandler.handleEmail(email1);
+        spamHandler.handleEmail(email2);
+        spamHandler.handleEmail(email3);
+        spamHandler.handleEmail(email4);
+    }
+}

src/lab9_responsibility_chain/ex1/handlers/ComplaintHandler.java

@@ -0,0 +1,16 @@
+package lab9_responsibility_chain.ex1.handlers;
+
+import lab9_responsibility_chain.ex1.Email;
+import lab9_responsibility_chain.ex1.EmailType;
+import lab9_responsibility_chain.ex1.Handler;
+
+public class ComplaintHandler extends Handler {
+    @Override
+    public void handleEmail(Email email) {
+        if (email.type() == EmailType.COMPLAINT) {
+            System.out.println("Forwarding complaint to legal department (" + email + ")");
+        } else if (successor != null) {
+            successor.handleEmail(email);
+        }
+    }
+}

src/lab9_responsibility_chain/ex1/handlers/FanHandler.java

@@ -0,0 +1,16 @@
+package lab9_responsibility_chain.ex1.handlers;
+
+import lab9_responsibility_chain.ex1.Email;
+import lab9_responsibility_chain.ex1.EmailType;
+import lab9_responsibility_chain.ex1.Handler;
+
+public class FanHandler extends Handler {
+    @Override
+    public void handleEmail(Email email) {
+        if (email.type() == EmailType.FAN) {
+            System.out.println("Forwarding fan email to CEO (" + email + ")");
+        } else if (successor != null) {
+            successor.handleEmail(email);
+        }
+    }
+}

src/lab9_responsibility_chain/ex1/handlers/NewLocHandler.java

@@ -0,0 +1,16 @@
+package lab9_responsibility_chain.ex1.handlers;
+
+import lab9_responsibility_chain.ex1.Email;
+import lab9_responsibility_chain.ex1.EmailType;
+import lab9_responsibility_chain.ex1.Handler;
+
+public class NewLocHandler extends Handler {
+    @Override
+    public void handleEmail(Email email) {
+        if (email.type() == EmailType.NEW_LOC) {
+            System.out.println("Forwarding request to business development (" + email + ")");
+        } else if (successor != null) {
+            successor.handleEmail(email);
+        }
+    }
+}

src/lab9_responsibility_chain/ex1/handlers/SpamHandler.java

@@ -0,0 +1,16 @@
+package lab9_responsibility_chain.ex1.handlers;
+
+import lab9_responsibility_chain.ex1.Email;
+import lab9_responsibility_chain.ex1.EmailType;
+import lab9_responsibility_chain.ex1.Handler;
+
+public class SpamHandler extends Handler {
+    @Override
+    public void handleEmail(Email email) {
+        if (email.type() == EmailType.SPAM) {
+            System.out.println("Deleting spam email (" + email + ")");
+        } else if (successor != null) {
+            successor.handleEmail(email);
+        }
+    }
+}

src/learn/simple_responsibility_chain/ConcreteHandler1.java

@@ -0,0 +1,19 @@
+package learn.simple_responsibility_chain;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class ConcreteHandler1 extends Handler {
+    private final List<String> myAnimals = Arrays.asList("cat", "dog", "horse");
+
+    @Override
+    public void handleRequest(Request request) {
+        if (myAnimals.contains(request.getValue())) {
+            System.out.println("Request for " + request.getValue() + " handled by " + this);
+        } else {
+            if (successor != null) {
+                successor.handleRequest(request);
+            }
+        }
+    }
+}

src/learn/simple_responsibility_chain/ConcreteHandler2.java

@@ -0,0 +1,19 @@
+package learn.simple_responsibility_chain;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class ConcreteHandler2 extends Handler {
+    private final List<String> myColors = Arrays.asList("red", "yellow", "blue");
+
+    @Override
+    public void handleRequest(Request request) {
+        if (myColors.contains(request.getValue())) {
+            System.out.println("Request for " + request.getValue() + " handled by " + this);
+        } else {
+            if (successor != null) {
+                successor.handleRequest(request);
+            }
+        }
+    }
+}

src/learn/simple_responsibility_chain/ConcreteHandler3.java

@@ -0,0 +1,17 @@
+package learn.simple_responsibility_chain;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class ConcreteHandler3 extends Handler {
+    private final List<String> myNumbers = Arrays.asList("1", "2", "3");
+
+    @Override
+    public void handleRequest(Request request) {
+        if (myNumbers.contains(request.getValue())) {
+            System.out.println("Request for " + request.getValue() + " handled by " + this);
+        } else {
+            throw new RuntimeException("Request could not be handled");
+        }
+    }
+}

src/learn/simple_responsibility_chain/Handler.java

@@ -0,0 +1,11 @@
+package learn.simple_responsibility_chain;
+
+public abstract class Handler {
+    protected Handler successor;
+
+    public void setSuccessor(Handler successor) {
+        this.successor = successor;
+    }
+
+    public abstract void handleRequest(Request request);
+}

src/learn/simple_responsibility_chain/Main.java

@@ -0,0 +1,21 @@
+package learn.simple_responsibility_chain;
+
+public class Main {
+    public static void main(String[] args) {
+        Handler firstHandler = new ConcreteHandler1();
+        Handler secondHandler = new ConcreteHandler2();
+        Handler thirdHandler = new ConcreteHandler3();
+
+        firstHandler.setSuccessor(secondHandler);
+        secondHandler.setSuccessor(thirdHandler);
+
+        Request request1 = new Request("dog");
+        firstHandler.handleRequest(request1);
+
+        Request request2 = new Request("3");
+        firstHandler.handleRequest(request2);
+
+        Request request3 = new Request("house");
+        firstHandler.handleRequest(request3);
+    }
+}

src/learn/simple_responsibility_chain/Request.java

@@ -0,0 +1,13 @@
+package learn.simple_responsibility_chain;
+
+public class Request {
+    private String value;
+
+    public Request(String value) {
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
+}