David Stern

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

@@ -0,0 +1,12 @@
+package com.booleanuk;
+
+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/bagels/BagelController.java → src/main/java/com/booleanuk/api/bagels/controller/BagelController.java

@@ -1,4 +1,7 @@
-package com.booleanuk.api.bagels;
+package com.booleanuk.api.bagels.controller;
+
+import com.booleanuk.api.bagels.model.pojo.Bagel;
+import com.booleanuk.api.bagels.model.repository.BagelRepository;
 
 import java.util.List;
 

src/main/java/com/booleanuk/api/bagels/Bagel.java → src/main/java/com/booleanuk/api/bagels/model/pojo/Bagel.java

@@ -1,4 +1,4 @@
-package com.booleanuk.api.bagels;
+package com.booleanuk.api.bagels.model.pojo;
 
 public class Bagel {
     private int id;

src/main/java/com/booleanuk/api/bagels/BagelRepository.java → src/main/java/com/booleanuk/api/bagels/model/repository/BagelRepository.java

@@ -1,4 +1,6 @@
-package com.booleanuk.api.bagels;
+package com.booleanuk.api.bagels.model.repository;
+
+import com.booleanuk.api.bagels.model.pojo.Bagel;
 
 import java.util.ArrayList;
 import java.util.List;

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

@@ -0,0 +1,88 @@
+package com.booleanuk.api.products.controller;
+
+import com.booleanuk.api.products.controller.dto.ProductDto;
+import com.booleanuk.api.products.model.pojo.Product;
+import com.booleanuk.api.products.model.repository.ProductRepository;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/products")
+public class ProductController {
+    ProductRepository productRepository;
+
+    public ProductController() {
+        this.productRepository = new ProductRepository();
+    }
+
+    // Get all
+    @GetMapping
+    public ResponseEntity<List<Product>> getAll() {
+        return ResponseEntity.ok(this.productRepository.findAll());
+    }
+
+    // Get by category
+    @GetMapping(params = "category")
+    public ResponseEntity<?> getByCategory(@RequestParam String category) {
+        try {
+            return ResponseEntity.ok(this.productRepository.findAllByCategory(category));
+        } catch (Exception e) {
+            return ResponseEntity
+                    .status(HttpStatus.NOT_FOUND)
+                    .body(e.getMessage());
+        }
+    }
+
+    // Get by id
+    @GetMapping("/{id}")
+    public ResponseEntity<?> getById(@PathVariable int id) {
+        try {
+            return ResponseEntity.ok(productRepository.findById(id));
+        } catch (Exception e) {
+            return ResponseEntity
+                    .status(HttpStatus.NOT_FOUND)
+                    .body(e.getMessage());
+        }
+    }
+
+    // Create
+    @PostMapping
+    public ResponseEntity<?> createProduct(@RequestBody ProductDto productCreateDto) {
+        try {
+            return ResponseEntity.status(HttpStatus.CREATED).body(productRepository.create(new Product(productCreateDto)));
+        } catch (Exception e) {
+            return ResponseEntity
+                    .status(HttpStatus.BAD_REQUEST)
+                    .body(e.getMessage());
+        }
+    }
+
+    // Update by id
+    @PutMapping("/{id}")
+    public ResponseEntity<?> updateProductId(@PathVariable int id, @RequestBody ProductDto body) {
+        try {
+            return ResponseEntity.status(HttpStatus.CREATED).body(this.productRepository.updateById(id, body));
+        } catch (Exception e) {
+            return ResponseEntity
+                    .status(HttpStatus.NOT_FOUND)
+                    .body(e.getMessage());
+        }
+    }
+
+    // Delete by id
+    @DeleteMapping("/{id}")
+    public ResponseEntity<?> deleteProduct(@PathVariable int id) {
+        try {
+            return ResponseEntity.ok(productRepository.deleteById(id));
+        } catch (Exception e) {
+            return ResponseEntity
+                    .status(HttpStatus.NOT_FOUND)
+                    .body(e.getMessage());
+        }
+
+    }
+}

src/main/java/com/booleanuk/api/products/controller/dto/ProductDto.java

@@ -0,0 +1,37 @@
+package com.booleanuk.api.products.controller.dto;
+
+public class ProductDto {
+    private String name;
+    private String category;
+    private int price;
+
+    public ProductDto(String name, String category, int price) {
+        this.name = name;
+        this.category = category;
+        this.price = price;
+    }
+
+    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/model/pojo/Product.java

@@ -0,0 +1,66 @@
+package com.booleanuk.api.products.model.pojo;
+
+import com.booleanuk.api.products.controller.dto.ProductDto;
+
+public class Product {
+    private static int nextId = 0;
+    private int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product() {
+
+    }
+
+    public Product(String name, String category, int price) {
+        setId(nextId++);
+        setName(name);
+        setCategory(category);
+        setPrice(price);
+    }
+
+    public Product(ProductDto productCreateDto) {
+        this(productCreateDto.getName(), productCreateDto.getCategory(), productCreateDto.getPrice());
+    }
+
+    public static int getNextId() {
+        return nextId;
+    }
+
+    public static void setNextId(int nextId) {
+        Product.nextId = nextId;
+    }
+
+    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/model/repository/ProductRepository.java

@@ -0,0 +1,79 @@
+package com.booleanuk.api.products.model.repository;
+
+import com.booleanuk.api.products.controller.dto.ProductDto;
+import com.booleanuk.api.products.model.pojo.Product;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ProductRepository {
+    private List<Product> products = new ArrayList<>();
+
+    // Find all
+    public List<Product> findAll() {
+        return products;
+    }
+
+    // Find all by category
+    public List<Product> findAllByCategory(String category) throws Exception {
+        List<Product> filtered = findAll().stream()
+                .filter(p -> category.equalsIgnoreCase(p.getCategory()))
+                .toList();
+
+        if (filtered.isEmpty()) {
+            throw new Exception("No products in the provided category were found");
+        }
+
+        return filtered;
+    }
+
+    // Find by id
+    public Product findById(int id) throws Exception {
+        return products.stream()
+                .filter(p -> p.getId() == id)
+                .findFirst()
+                .orElseThrow(() -> new Exception("Not found"));
+    }
+
+    // Create
+    public Product create(Product product) throws Exception {
+        List<Product> filtered = products
+                .stream()
+                .filter(p -> p.getName().equals(product.getName()))
+                .toList();
+
+        if (filtered.isEmpty()) {
+            Product newProduct = new Product(product.getName(), product.getCategory(), product.getPrice());
+            products.add(newProduct);
+            return product;
+        }
+
+        throw new Exception("Product with provided name already exists");
+    }
+
+    // Update by id
+    public Product updateById(int id, ProductDto body) throws Exception {
+        // Will throw if product with id not found
+        Product currentProduct = findById(id);
+
+        // Check if name already in other product
+        List<Product> filtered = products.stream()
+                .filter(p -> p.getName().equals(body.getName()))
+                .toList();
+        if (!filtered.isEmpty()) {
+            throw new Exception("Product with provided name already exists");
+        }
+        currentProduct.setName(body.getName());
+        currentProduct.setCategory(body.getCategory());
+        currentProduct.setPrice(body.getPrice());
+        return currentProduct;
+    }
+
+    // Delete by id
+    public Product deleteById(int id) throws Exception {
+        Product productToDelete = findById(id);
+        products = products.stream().filter(p -> p.getId() != id).toList();
+        return productToDelete;
+    }
+
+}