Mattias Hedbom

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 int id;
+
+    private String name;
+    private String category;
+    private int price;
+
+    public Product(String name, String category, int price){
+        this.id = nextId;
+        nextId++;
+
+        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 int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+}

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 org.springframework.web.server.ResponseStatusException;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("products")
+public class ProductController {
+    private ProductRepository theProducts;
+
+    public ProductController(){
+        this.theProducts = new ProductRepository();
+    }
+
+
+    @GetMapping
+    public List<Product> getAllProducts(@RequestParam(name = "category", required = false) String category){
+        if(category == null){
+            return this.theProducts.getAll();
+        }
+
+        List<Product> listByCategory = this.theProducts.getAllProductsByCategory(category);
+        if(listByCategory.isEmpty()){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "There are no products that have the entered category!");
+        }
+        return listByCategory;
+    }
+
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product createProduct(@RequestBody Product product){
+        Product productToCreate = this.theProducts.isNameAlreadyContainedInList(product);
+        if(productToCreate == null){
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with the same name already exists in the list!");
+        }
+
+        return this.theProducts.create(product);
+    }
+
+
+    @GetMapping("{id}")
+    public Product getProductById(@PathVariable int id){
+        Product productToGet = this.theProducts.getProductById(id);
+        if(productToGet == null){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "There is no product with the entered ID!");
+        }
+        return productToGet;
+    }
+
+
+    @PutMapping("{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product updateProductById(@PathVariable int id, @RequestBody Product product){
+        Product aProduct = this.theProducts.getProductById(id);
+        if(aProduct == null){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "There is no product with the entered ID!");
+        }
+
+        aProduct = this.theProducts.isNameAlreadyContainedInList(id, product);
+        if(aProduct == null){
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with the same name already exists in the list!");
+        }
+
+        return this.theProducts.updateProductById(id, product);
+    }
+
+
+    @DeleteMapping("{id}")
+    public Product deleteProductById(@PathVariable int id){
+        Product productToDelete = this.theProducts.getProductById(id);
+        if(productToDelete == null){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "There is no product with the entered ID!");
+        }
+
+        return this.theProducts.deleteProductById(id);
+    }
+}

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

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+package com.booleanuk.api.products;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ProductRepository {
+    private List<Product> products;
+
+    public ProductRepository(){
+        this.products = new ArrayList<>(){{
+            add(new Product("Harry Potter and the goblet of fire", "Book", 10));
+            add(new Product("Antilop", "Chair", 59));
+            add(new Product("Hobbit", "Book", 15));
+        }};
+    }
+
+    public List<Product> getAll(){
+        return this.products;
+    }
+
+    public Product create(Product newProduct){
+        this.products.add(newProduct);
+        return newProduct;
+    }
+
+    public Product getProductById(int id){
+        Product product = null;
+        for(Product aProduct : this.products){
+            if(id == aProduct.getId()){
+                product = aProduct;
+                return product;
+            }
+        }
+        return product;
+    }
+
+    public Product updateProductById(int id, Product productToUpdate){
+        for(Product aProduct : this.products){
+            if(aProduct.getId() == id){
+                aProduct.setName(productToUpdate.getName());
+                aProduct.setCategory(productToUpdate.getCategory());
+                aProduct.setPrice(productToUpdate.getPrice());
+
+                return aProduct;
+            }
+        }
+        return null;
+    }
+
+    public Product deleteProductById(int id){
+        for(Product aProduct : this.products){
+            if(aProduct.getId() == id){
+                this.products.remove(aProduct);
+                return aProduct;
+            }
+        }
+        return null;
+    }
+
+    public Product isNameAlreadyContainedInList(Product productToCheck){
+        for(Product aProduct : this.products){
+            if(aProduct.getName().equals(productToCheck.getName())){
+                productToCheck = null;
+                return productToCheck;
+            }
+        }
+        return productToCheck;
+    }
+
+    public Product isNameAlreadyContainedInList(int id, Product productToCheck){
+        for(Product aProduct : this.products){
+            if(aProduct.getName().equals(productToCheck.getName()) && aProduct.getId() != id){
+                productToCheck = null;
+                return productToCheck;
+            }
+        }
+        return productToCheck;
+    }
+
+    public List<Product> getAllProductsByCategory(String category){
+        return this.products.stream()
+                .filter(s -> s.getCategory().equals(category)).toList();
+    }
+}