Magnus Hissingby

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

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+package com.booleanuk.api.products;
+
+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/products/controller/ProductController.java

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+package com.booleanuk.api.products.controller;
+
+import com.booleanuk.api.products.model.Product;
+import com.booleanuk.api.products.model.ProductRepository;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("products")
+public class ProductController {
+    ProductRepository repository;
+
+    public ProductController(ProductRepository repository) {
+        this.repository = repository;
+    }
+
+    @GetMapping
+    public List<Product> getAll(@RequestParam(required = false) String category) {
+        return this.repository.findAll(category);
+    }
+
+    @GetMapping("{id}")
+    public Product getById(@PathVariable int id) {
+        return repository.find(id);
+    }
+
+    @PostMapping
+    public Product createProduct(@RequestBody Product newProduct){
+        return repository.addProduct(newProduct);
+    }
+
+    @PutMapping("{id}")
+    public Product updateProduct(@PathVariable int id, @RequestBody String name){
+        return repository.updateProduct(id, name);
+    }
+
+    @DeleteMapping("{id}")
+    public boolean deleteProduct(@PathVariable int id){
+        return repository.deleteProduct(id);
+    }
+}

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

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

src/main/java/com/booleanuk/api/products/model/ProductRepository.java

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+package com.booleanuk.api.products.model;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Repository;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Repository
+public class ProductRepository {
+    private int idCounter = 1;
+    private List<Product> data = new ArrayList<>();
+
+    public ProductRepository() {
+        Product product1 = new Product(this.idCounter++, "car", "utilities", 10000);
+        Product product2 = new Product(this.idCounter++, "house", "utilities", 200000);
+        Product product3 = new Product(this.idCounter++, "beer", "drink", 5);
+        this.data.add(product1);
+        this.data.add(product2);
+        this.data.add(product3);
+    }
+
+    public List<Product> findAll(String category) {
+        if (category != null && !category.isEmpty()){
+            List<Product> ls = this.data.stream().filter(n -> n.getCategory().equals(category)).toList();
+            if (ls.isEmpty()){
+                throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No products of the provided category were found.");
+            }
+            return ls;
+        }
+        return this.data;
+    }
+
+    public Product find(int id) {
+        List<Product> product = this.data.stream()
+                .filter(prod -> prod.getId() == id)
+                .toList();
+        if (product.isEmpty()){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found.");
+        }
+        return product.getFirst();
+    }
+
+    public Product addProduct(Product product){
+        if (data.stream().filter(it -> it.getName().equals(product.getName())).toList().isEmpty()){
+            this.data.add(product);
+            throw new ResponseStatusException(HttpStatus.CREATED, "Create a new product");
+        }
+        throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists.");
+    }
+
+    public Product updateProduct(int id, String name){
+        Product product = find(id);
+        List<Product> existingProduct = data.stream().filter(it -> it.getName().equals(name)).toList();
+
+        if (!existingProduct.isEmpty()){
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists.");
+        }
+        product.setName(name);
+        throw new ResponseStatusException(HttpStatus.CREATED, "Product successfully updated.");
+    }
+
+    public boolean deleteProduct(int id){
+        Product product = find(id);
+        this.data.remove(product);
+        throw new ResponseStatusException(HttpStatus.OK, "Product successfully deleted.");
+    }
+}