Lab 4 final

Author: afloarea

lab04/lab04-main/src/main/java/ro/unibuc/lab04/main/App.java

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+package ro.unibuc.lab04.main;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class App {
+
+    public static void main(String[] args) {
+        SpringApplication.run(App.class);
+    }
+
+}

lab04/lab04-main/src/main/java/ro/unibuc/lab04/main/DishController.java

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+package ro.unibuc.lab04.main;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import ro.unibuc.lab04.main.dto.DishDto;
+import ro.unibuc.lab04.main.service.DishService;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/dishes")
+public class DishController {
+
+    private final DishService dishService;
+
+    public DishController(DishService dishService) {
+        this.dishService = dishService;
+    }
+
+    @GetMapping
+    public List<DishDto> getDishes() {
+        return dishService.getAll();
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public DishDto addDish(@RequestBody DishDto dto) {
+        return dishService.addDish(dto);
+    }
+
+    @GetMapping("/{dishId}")
+    public ResponseEntity<DishDto> getById(@PathVariable("dishId") int dishId) {
+        return ResponseEntity.of(dishService.getById(dishId));
+    }
+
+    @DeleteMapping("/{dishId}")
+    public void deleteById(@PathVariable("dishId") int dishId) {
+        dishService.deleteById(dishId);
+    }
+
+    @PutMapping("/{dishId}")
+    public ResponseEntity<DishDto> updateDish(@RequestBody DishDto body, @PathVariable("dishId") int dishId) {
+        return ResponseEntity.of(dishService.update(new DishDto(dishId, body.name(), body.price())));
+    }
+
+}

lab04/lab04-main/src/main/java/ro/unibuc/lab04/main/dto/DishDto.java

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+package ro.unibuc.lab04.main.dto;
+
+public record DishDto(Integer id, String name, int price) {
+}

lab04/lab04-main/src/main/java/ro/unibuc/lab04/main/model/Dish.java

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+package ro.unibuc.lab04.main.model;
+
+public record Dish(Integer id, String name, int price) {
+
+    public Dish(String name, int price) {
+        this(null, name, price);
+    }
+}

lab04/lab04-main/src/main/java/ro/unibuc/lab04/main/repo/DishRepository.java

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+package ro.unibuc.lab04.main.repo;
+
+import ro.unibuc.lab04.main.model.Dish;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface DishRepository {
+
+    Dish add(Dish dish);
+
+    List<Dish> findAll();
+
+    Dish removeById(int id);
+
+    Dish update(Dish dish);
+
+    Optional<Dish> findById(int id);
+
+}

lab04/lab04-main/src/main/java/ro/unibuc/lab04/main/repo/InMemoryDishRepository.java

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+package ro.unibuc.lab04.main.repo;
+
+import org.springframework.stereotype.Repository;
+import ro.unibuc.lab04.main.model.Dish;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+@Repository
+public class InMemoryDishRepository implements DishRepository {
+
+    private final Map<Integer, Dish> dishById = new HashMap<>();
+    private int idCounter = 0;
+
+    @Override
+    public Dish add(Dish dish) {
+        final var storedDish = new Dish(++idCounter, dish.name(), dish.price());
+        dishById.put(storedDish.id(), storedDish);
+        return storedDish;
+    }
+
+    @Override
+    public List<Dish> findAll() {
+        return dishById.values().stream().toList();
+    }
+
+    @Override
+    public Dish removeById(int id) {
+        return dishById.remove(id);
+    }
+
+    @Override
+    public Dish update(Dish dish) {
+        return dishById.computeIfPresent(dish.id(), (k, v) -> dish);
+    }
+
+    @Override
+    public Optional<Dish> findById(int id) {
+        return Optional.ofNullable(dishById.get(id));
+    }
+}

lab04/lab04-main/src/main/java/ro/unibuc/lab04/main/service/DishService.java

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+package ro.unibuc.lab04.main.service;
+
+import ro.unibuc.lab04.main.dto.DishDto;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface DishService {
+
+    DishDto addDish(DishDto dish);
+
+    List<DishDto> getAll();
+
+    Optional<DishDto> getById(int dishId);
+
+    Optional<DishDto> update(DishDto dish);
+
+    void deleteById(int dishId);
+
+}

lab04/lab04-main/src/main/java/ro/unibuc/lab04/main/service/SimpleDishService.java

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+package ro.unibuc.lab04.main.service;
+
+import org.springframework.stereotype.Service;
+import ro.unibuc.lab04.main.dto.DishDto;
+import ro.unibuc.lab04.main.model.Dish;
+import ro.unibuc.lab04.main.repo.DishRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class SimpleDishService implements DishService {
+
+    private final DishRepository dishRepo;
+
+    public SimpleDishService(DishRepository dishRepo) {
+        this.dishRepo = dishRepo;
+    }
+
+    @Override
+    public DishDto addDish(DishDto dish) {
+        final var savedDish =  dishRepo.add(new Dish(dish.name(), dish.price()));
+        return mapToDto(savedDish);
+    }
+
+    @Override
+    public List<DishDto> getAll() {
+        return dishRepo.findAll().stream()
+                .map(SimpleDishService::mapToDto)
+                .toList();
+    }
+
+    @Override
+    public Optional<DishDto> getById(int dishId) {
+        return dishRepo.findById(dishId).map(SimpleDishService::mapToDto);
+    }
+
+    @Override
+    public Optional<DishDto> update(DishDto dish) {
+        return Optional.ofNullable(dishRepo.update(mapToModel(dish))).map(SimpleDishService::mapToDto);
+    }
+
+    @Override
+    public void deleteById(int dishId) {
+        dishRepo.removeById(dishId);
+    }
+
+    private static DishDto mapToDto(Dish dish) {
+        return new DishDto(dish.id(), dish.name(), dish.price());
+    }
+
+    private static Dish mapToModel(DishDto dto) {
+        return new Dish(dto.id(), dto.name(), dto.price());
+    }
+}