André Velkov Janusev

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

@@ -0,0 +1,23 @@
+package com.booleanuk.api;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class CorsConfig {
+
+    @Bean
+    public WebMvcConfigurer corsConfigurer() {
+        return new WebMvcConfigurer() {
+            @Override
+            public void addCorsMappings(CorsRegistry registry) {
+                registry.addMapping("/**") // allow all paths
+                        .allowedOrigins("*") // http://localhost:3000
+                        .allowedMethods("GET", "POST", "PUT", "DELETE")
+                        .allowedHeaders("*");
+            }
+        };
+    }
+}

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

@@ -0,0 +1,11 @@
+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

@@ -0,0 +1,49 @@
+package com.booleanuk.api.products;
+
+public class Product {
+    private int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product() {
+    }
+
+    public Product(String name, String category, int price) {
+        this.name = name;
+        this.category = category;
+        this.price = price;
+    }
+
+    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/products/ProductController.java

@@ -0,0 +1,68 @@
+package com.booleanuk.api.products;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.NoSuchElementException;
+
+@RestController
+@RequestMapping("/products")
+public class ProductController {
+    ProductRepository repository;
+
+    public ProductController(ProductRepository repository) {
+        this.repository = repository;
+    }
+
+    @PostMapping
+    public ResponseEntity<?> createProduct(@RequestBody Product product) {
+        try {
+            Product p = this.repository.createProduct(product);
+            return ResponseEntity.status(HttpStatus.CREATED).body(p);
+        } catch (Exception e) {
+            return ResponseEntity.badRequest().body("Error creating product: " + e.getMessage());
+        }
+    }
+
+    @GetMapping
+    public ResponseEntity<?> getAllProducts(@RequestParam String category ) {
+        try {
+            return ResponseEntity.ok(this.repository.getAllProducts(category));
+        } catch (Exception e) {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).body("Error: " + e.getMessage());
+        }
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<?> getSingleProduct(@PathVariable int id) {
+        try {
+            return ResponseEntity.ok(this.repository.getSingleProduct(id));
+        } catch (Exception e) {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).body("Error.. " + e.getMessage());
+        }
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<?> updateProduct(@PathVariable int id, @RequestBody Product body) {
+        try {
+            return ResponseEntity.status(HttpStatus.CREATED).body(this.repository.updateProduct(id, body));
+        } catch (IllegalArgumentException e) {
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Error: " + e.getMessage());
+        } catch (NoSuchElementException e) {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).body("Error: " + e.getMessage());
+        }
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<?> deleteProduct(@PathVariable int id) {
+        try {
+            this.repository.deleteProduct(id);
+            return ResponseEntity.status(HttpStatus.OK).body("Product removed.");
+        } catch (NoSuchElementException e) {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).body("Error: " + e.getMessage());
+        }
+    }
+
+}

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

@@ -0,0 +1,68 @@
+package com.booleanuk.api.products;
+
+import org.springframework.stereotype.Repository;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+@Repository
+public class ProductRepository {
+    private int idCounter = 1;
+    private List<Product> productList = new ArrayList<>();
+
+    public ProductRepository() {}
+
+    public Product createProduct(Product product) throws Exception {
+        for (Product p : productList) {
+            if (p.getName().equalsIgnoreCase(product.getName())) {
+                throw new Exception("Product with provided name already exists.");
+            }
+        }
+
+        product.setId(idCounter++);
+        this.productList.add(product);
+        return product;
+    }
+
+    public List<Product> getAllProducts(String category) throws Exception {
+        List<Product> list = productList.stream()
+                                        .filter(product -> product.getCategory().equalsIgnoreCase(category))
+                                        .toList();
+        if (!list.isEmpty()) {
+            return list;
+        } else {
+            throw new Exception("No products of the provided category were found.");
+        }
+    }
+
+    public Product getSingleProduct(int id) {
+        return productList.stream()
+                .filter(product ->  product.getId() == id)
+                .findFirst().orElseThrow(() -> new NoSuchElementException("Product not found with id: " + id));
+    }
+
+    public Product updateProduct(int id, Product body) {
+        Product product = productList.stream()
+                                    .filter(p -> p.getId() == id)
+                                    .findFirst().orElseThrow(() -> new NoSuchElementException("Product not found with id: " + id));
+
+        for (Product p : productList) {
+            if (p.getName().equalsIgnoreCase(body.getName()))
+                throw new IllegalArgumentException("Product with provided name already exists.");
+        }
+
+        product.setName(body.getName());
+        product.setCategory(body.getCategory());
+        product.setPrice(body.getPrice());
+        return product;
+    }
+
+    public void deleteProduct(int id) {
+        Product product = productList.stream()
+                .filter(p -> p.getId() == id)
+                .findFirst().orElseThrow(() -> new NoSuchElementException("Product not found with id: " + id));
+
+        productList.remove(product);
+    }
+}