Robin Kaga

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/products/Product.java

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+package com.booleanuk.api.products;
+
+public class Product {
+    private static int nextId = 1;
+    private final int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product(String name, String category, int price){
+        this.id = nextId;
+        nextId+=1;
+        this.name = name;
+        this.category = category;
+        this.price = price;
+    }
+
+    public int getId(){
+        return this.id;
+    }
+
+    public String getName(){
+        return this.name;
+    }
+
+    public void setName(String newName){
+        this.name = newName;
+    }
+
+    public String getCategory(){
+        return this.category;
+    }
+
+    public void setCategory(String newCategory){
+        this.category = newCategory;
+    }
+
+    public int getPrice(){
+        return this.price;
+    }
+
+    public void setPrice(int newPrice){
+        this.price = newPrice;
+    }
+}

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

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+package com.booleanuk.api.products;
+
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("products")
+public class ProductController {
+    private ProductRepository productRepo = new ProductRepository();
+
+    @GetMapping
+    public List<Product> getProducts(@RequestParam (required = false) String category){
+        if (category != null){
+            return this.productRepo.getByCategory(category);
+        }
+        return this.productRepo.getAll();
+    }
+
+    @GetMapping("/{id}")
+    public Product getOneProduct(@PathVariable(name = "id") int id){
+        return this.productRepo.getOne(id);
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product createOneProduct(@RequestBody Product product){
+        return this.productRepo.createProduct(product);
+    }
+
+    @PutMapping("/{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product updateOneProduct(@PathVariable(name = "id") int id, @RequestBody Product product){
+        return this.productRepo.updateProduct(id, product);
+    }
+
+    @DeleteMapping("/{id}")
+    public Product deleteOneProduct(@PathVariable(name = "id") int id){
+        return this.productRepo.deleteProduct(id);
+    }
+
+
+}

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

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+package com.booleanuk.api.products;
+
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.ArrayList;
+
+public class ProductRepository {
+
+    private ArrayList<Product> products = new ArrayList<>(){{
+        add(new Product("How to build APIs", "Book", 1500));
+        add(new Product("Elden Ring", "Game", 90));
+    }};
+
+    public Product createProduct(Product product){
+        for (Product p : products){
+            if (p.getName().equals(product.getName())){
+                throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Provided name already exists!");
+            }
+        }
+        this.products.add(product);
+        return product;
+    }
+
+    public ArrayList<Product> getAll(){
+        return this.products;
+    }
+
+    public ArrayList<Product> getByCategory(String category){
+        ArrayList<Product> categoryList = new ArrayList<>();
+        for (Product p : products){
+            if (p.getCategory().toLowerCase().equals(category)){
+                categoryList.add(p);
+            }
+        }
+        if (!categoryList.isEmpty()){
+            return categoryList;
+        }
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No products of the provided category were found!");
+    }
+
+    public Product getOne(int id){
+        for (Product p : products){
+            if (p.getId() == id){
+                return p;
+            }
+        }
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found!");
+    }
+
+    public Product updateProduct(int id, Product product){
+        for (Product p : products){
+            if (p.getId() == id){
+                for (Product ps : products){
+                    if (ps.getName().equals(product.getName()) && ps != p){
+                        throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists!");
+                    }
+                }
+                p.setName(product.getName());
+                p.setCategory(product.getCategory());
+                p.setPrice(product.getPrice());
+                return p;
+            }
+        }
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found!");
+    }
+
+    public Product deleteProduct(int id){
+        for (Product p : products){
+            if (p.getId() == id){
+                products.remove(p);
+                return p;
+            }
+        }
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found!");
+    }
+
+}