Jostein Ruen

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.java

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+package com.booleanuk.api;
+
+public class Product {
+    private static int uniqueId = 1;
+    private int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product(String name, String category, int price) {
+        this.name = name;
+        this.category = category;
+        this.price = price;
+        this.id = uniqueId;
+        uniqueId++;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = 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/ProductController.java

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+package com.booleanuk.api;
+
+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 productRepository;
+
+    public ProductController(){
+        this.productRepository = new ProductRepository();
+    }
+
+    @GetMapping List<Product> getAll(@RequestParam(required = false) String category){
+        return this.productRepository.findAll(category);
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product create(@RequestBody Product product){
+        this.productRepository.create(product.getName(), product.getCategory(), product.getPrice());
+        return product;
+    }
+
+    @GetMapping("/{id}")
+    public Product getSpecificProduct(@PathVariable int id){
+        return this.productRepository.findSpecificProduct(id);
+    }
+
+    @DeleteMapping("/{id}")
+    public Product deleteProduct(@PathVariable int id){
+        return this.productRepository.delete(id);
+    }
+
+    @PutMapping("/{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product updateProduct(@PathVariable int id, @RequestBody Product product){
+        Product newProduct = this.productRepository.update(id, product);
+
+        if(newProduct == null){
+            for (int i = 0; i < productRepository.getProducts().size(); i++){
+
+            }
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "The product with the ID: " + id + " could not be found in repository");
+        }
+        return newProduct;
+    }
+}

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

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+package com.booleanuk.api;
+
+import com.sun.net.httpserver.HttpsServer;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ProductRepository {
+
+    private List<Product> products = new ArrayList<>();
+
+    public ProductRepository(){
+        products.add(new Product("Corn flakes", "Food", 20));
+    }
+
+    public void create(String name, String category, int price){
+        for(Product p: products){
+            if(p.getName().equals(name)){
+                throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product already exists in storage");
+            }
+        }
+        Product product = new Product(name,category,price);
+        this.products.add(product);
+    }
+
+    public List<Product> findAll(String category) {
+        //If no parameter, just return the entire list
+        if(category == null){
+            return products;
+        }
+        List<Product> categoryList = new ArrayList<>();
+        for(Product p: products){
+            if(p.getCategory().equalsIgnoreCase(category)){
+                categoryList.add(p);
+            }
+        }
+        if(categoryList.isEmpty()){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Couldn't find any products in the given category");
+        }
+        return categoryList;
+    }
+
+    public Product update(int id, Product newProduct){
+        for(Product p: products){
+            if(p.getId() == id){
+                p.setName(newProduct.getName());
+                p.setCategory(newProduct.getCategory());
+                p.setPrice(newProduct.getPrice());
+                return newProduct;
+            }
+        }
+        return null;
+    }
+
+    public Product delete(int id){
+        for(Product p: products){
+            if(p.getId() == id){
+                products.remove(p);
+                return p;
+            }
+        }
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "The product with the ID: " + id + " does not exist");
+    }
+
+    public Product findSpecificProduct(int id){
+        for(Product p: products){
+            if(p.getId() == id){
+                return p;
+            }
+        }
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Couldn't find the product with ID: " + id);
+    }
+
+    public List<Product> getProducts() {
+        return products;
+    }
+}