Isabell Tran

src/main/java/com/booleanuk/api/Main.java

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+package com.booleanuk.api;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Main {
+    public static void main(String[] args) {
+        SpringApplication.run(Main.class, args);
+    }
+}

src/main/java/com/booleanuk/api/Product/Product.java

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+package com.booleanuk.api.Product;
+
+public class Product {
+    private int id;
+    private String name;
+    private String category;
+    private Integer price;
+
+    public Product(int id, String name, String category, Integer price){
+        this.id = id;
+        this.name = name;
+        this.category = category;
+        this.price = price;
+
+    }
+
+    public int getId() { return id; }
+
+    public String getName() { return name; }
+
+    public void setName(String name) {this.name = name; }
+
+    public String getCategory() { return category; }
+
+    public void setCategory(String category) {this.category = category; }
+
+    public Integer getPrice() { return price; }
+
+    public void setPrice(Integer price) {this.price = price; }
+}

src/main/java/com/booleanuk/api/Product/ProductController.java

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+package com.booleanuk.api.Product;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+import com.booleanuk.api.Product.ProductRepository;
+import org.springframework.web.server.ResponseStatusException;
+import java.util.List;
+
+@RestController
+@RequestMapping("/products")
+public class ProductController {
+    ProductRepository repository;
+
+    public ProductController() {
+        this.repository = new ProductRepository();
+    }
+
+    @GetMapping
+    public List<Product> getAll() {
+        List<Product> products = this.repository.findAll();
+        if (products.isEmpty()){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No products of the provided category were found");
+        }
+        return products;
+    }
+
+
+    @PostMapping
+    public Product addProduct(@RequestBody Product product){
+        List<Product> items = this.getAll();
+
+        boolean exists = items.stream()
+                .anyMatch(item -> item.getName().equals(product.getName()));
+
+        if (exists) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists.");
+        }
+
+        return this.repository.create(product.getName(), product.getCategory(), product.getPrice());
+    }
+
+    @GetMapping("{id}")
+    public Product findId(@PathVariable int id) {
+        Product product = this.repository.find(id);
+
+        if (product == null){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found");
+        }
+
+        return product;
+    }
+
+    @PutMapping("{id}")
+    public Product updateProduct(@PathVariable int id, @RequestBody Product product){
+
+        Product existing = this.repository.find(id);
+
+        if (existing == null){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found");
+        }
+
+        boolean nameExists = this.repository.findAll().stream()
+                .anyMatch(p -> !(p.getId() == id) && p.getName().equals(product.getName()));
+
+        if (nameExists) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists.");
+        }
+
+        return this.repository.updateProduct(id, product);
+    }
+
+    @DeleteMapping("/{id}")
+    public Product deleteProduct(@PathVariable int id){
+        Product delete = this.repository.deleteProduct(id);
+
+        if (delete == null){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found");
+        }
+
+        return delete;
+    }
+
+}

src/main/java/com/booleanuk/api/Product/ProductRepository.java

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+package com.booleanuk.api.Product;
+
+import java.util.*;
+
+public class ProductRepository {
+    private int idCounter = 1;
+    private List<Product> data = new ArrayList<>();
+
+    public ProductRepository(){
+        this.data.add(new Product(0, "Eple", "Frukt", 10));
+    }
+
+
+    public Product create(String name, String category, int price) {
+        Product product = new Product(this.idCounter++, name, category, price);
+        this.data.add(product);
+        return product;
+    }
+
+    public List<Product> findAll() { return this.data; }
+
+    public Product find (int id) {
+        return this.data.stream()
+                .filter(product -> product.getId() == id)
+                .findFirst()
+                .orElse(null);
+    }
+
+    public Product deleteProduct(int id){
+        Product product = this.find(id);
+        if (product == null) return null;
+        this.data.remove(product);
+        return product;
+    }
+
+    public Product updateProduct(int id, Product product){
+        Product product1 = this.find(id);
+        product1.setName(product.getName());
+        product1.setCategory(product.getCategory());
+        product1.setPrice(product.getPrice());
+        return product1;
+    }
+}