Frida Anselin

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 = 0;
+    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 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

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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> pCategory = this.theProducts.getProductsInCategory(category);
+        if (pCategory == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No products of the provided category were found.");
+        }
+        return pCategory;
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product createProduct(@RequestBody Product product) {
+        if (this.theProducts.isNameInList(product)) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists");
+        }
+        return this.theProducts.create(product);
+    }
+
+    @GetMapping("/{id}")
+    public Product getAProduct(@PathVariable int id) {
+        Product product = this.theProducts.getOne(id);
+        if (product == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found");
+        }
+        return product;
+    }
+
+    @PutMapping("/{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product updateAproduct(@PathVariable int id, @RequestBody Product product) {
+        if (theProducts.isNameInList(product)) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists");
+        }
+        Product pToUpdate = this.theProducts.update(id, product);
+        if (pToUpdate == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found");
+        }
+        return product;
+    }
+
+    @DeleteMapping("/{id}")
+    public Product deleteProduct(@PathVariable int id) {
+        Product product = this.theProducts.delete(id);
+        if (product == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found");
+        }
+        return product;
+    }
+}

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<>();
+
+        this.products.add(new Product("Bagel", "Food", 10));
+        this.products.add(new Product("Tea", "Food", 12));
+        this.products.add(new Product("Harry Potter", "Book", 100));
+    }
+
+    public List<Product> getProductsInCategory(String category) {
+        List<Product> pCategory = new ArrayList<>();
+        for (Product product : this.products) {
+            if (product.getCategory().toLowerCase().equals(category)) {
+                pCategory.add(product);
+            }
+        }
+        if (!pCategory.isEmpty()) {
+            return pCategory;
+        }
+        return null;
+    }
+
+    public List<Product> getAll() {
+        return this.products;
+    }
+
+    public Product create(Product product) {
+        this.products.add(product);
+        return product;
+    }
+
+    public Product getOne(int id) {
+        for (Product product : this.products) {
+            if (id == product.getId()) {
+                return product;
+            }
+        }
+        return null;
+    }
+
+    public Product update(int id, Product product) {
+        Product pToUpdate = getOne(id);
+            if (pToUpdate != null) {
+                this.products.get(id).setName(product.getName());
+                this.products.get(id).setCategory(product.getCategory());
+                this.products.get(id).setPrice(product.getPrice());
+                return this.products.get(id);
+            }
+        return null;
+    }
+
+    public Product delete(int id) {
+        Product pToDelete = getOne(id);
+        if (pToDelete != null) {
+            return this.products.remove(id);
+        }
+        return null;
+    }
+
+    public boolean isNameInList(Product product) {
+        for (Product pToFind : this.products) {
+            if (pToFind.getName().equals(product.getName())) {
+                return true;
+            }
+        }
+        return false;
+    }
+}