ADD::added comments to most classes to make it more understandable

src/Server/src/main/java/greenify/server/data/repository/UserRepository.java

@@ -3,6 +3,7 @@ package greenify.server.data.repository;
 import greenify.server.data.model.User;
 import org.springframework.data.repository.CrudRepository;
 
+//userRepository that saves all the user and talks to the database
 public interface UserRepository extends CrudRepository<User, Integer> {
     User findByName(String name);
 

src/Server/src/main/java/greenify/server/rest/RestExceptionHandler.java

@@ -7,6 +7,7 @@ import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.ResponseStatus;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 
+//class that handles exceptions for the rest server
 @RestControllerAdvice
 public class RestExceptionHandler {
     @ExceptionHandler(ApplicationException.class)

src/Server/src/main/java/greenify/server/rest/UserController.java

@@ -7,23 +7,28 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+//class that controls the user with regards to the server and sending data between them
+//this class kind of 'redirects' the requests from the client to the server
 @RestController
 public class UserController {
     @Autowired
     UserService userService;
 
+    //registers a user in the userService
     @RequestMapping("/registerUser")
     public UserDto registerUser(@RequestParam(value = "name") String name,
                                 @RequestParam(value = "password") String password) {
         return userService.registerUser(name, password);
     }
 
+    //logs a user in in the userService
     @RequestMapping("/loginUser")
     public UserDto loginUser(@RequestParam(value = "name") String name,
                              @RequestParam(value = "password") String password) {
         return userService.loginUser(name, password);
     }
 
+    //adds a vegan meal to the user
     @RequestMapping("/addVeganMeal")
     public void addVeganMeal(@RequestParam(value = "id") Long id,
                                 @RequestParam(value = "name") String name) {

src/Server/src/main/java/greenify/server/service/UserService.java

@@ -11,12 +11,14 @@ import org.springframework.stereotype.Service;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ResponseBody;
 
+//userService class that gets used by the server to handle requests for users
 @Service
 public class UserService {
     Logger logger = LoggerFactory.getLogger(UserService.class);
 
     @Autowired
     UserRepository userRepository;
+    //userRepository to talk with the database
 
     /**
      * registers the user.
@@ -26,13 +28,16 @@ public class UserService {
      */
     public UserDto registerUser(String name, String password) {
         User user = userRepository.findByName(name);
+        //find the name of the user in the database
         if (user == null) {
             user = new User(null, name, password, 0);
+            //if the user isn't already in the database, save it in there
             userRepository.save(user);
         } else {
             throw new ApplicationException("User already exists");
         }
         logger.info("Created user id=" + user.getId() + ", name=" + user.getName());
+        //return a transferable user object that has been saved
         return new UserDto(user.getId(), user.getName(), user.getVeganMeal());
     }
 
@@ -44,13 +49,16 @@ public class UserService {
      */
     public UserDto loginUser(String name, String password) {
         User user = userRepository.findByName(name);
+        //again find the name
         if (user == null) {
             throw new ApplicationException("User does not exist");
+            //if it doesn't exist or the password is wrong, throw an exception
         } else {
             if (!user.getPassword().equals(password)) {
                 throw new ApplicationException("Wrong password");
             }
         }
+        //return a transferable user object that has been logged in
         return new UserDto(user.getId(), user.getName(), user.getVeganMeal());
     }
 
@@ -62,8 +70,10 @@ public class UserService {
     public void addVeganMeal(Long id, String name) {
         User user = userRepository.findByName(name);
         int count = user.getVeganMeal();
+        //find the user and update their vegetarian meal count
         count++;
         user.setVeganMeal(count);
+        //save it to the database
         userRepository.save(user);
         logger.info("Added vegan meal to user(id=" + user.getId()
                 + ", name=" + user.getName() + ")");