Matilda Sönnergaard

build.gradle

@@ -1,7 +1,7 @@
 plugins {
 	id 'java'
-	id 'org.springframework.boot' version '3.3.1'
-	id 'io.spring.dependency-management' version '1.1.5'
+	id 'org.springframework.boot' version '3.4.1'
+	id 'io.spring.dependency-management' version '1.1.7'
 }
 
 group = 'com.example'

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 +1,43 @@
+package com.booleanuk.api.products;
+
+public class Product {
+    private int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product(int id, String name, String category, int price) {
+        this.id = id;
+        this.name = name;
+        this.category = category;
+        this.price = price;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getCategory() {
+        return category;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setCategory(String category) {
+        this.category = category;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+}

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

@@ -0,0 +1,80 @@
+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;
+import java.util.NoSuchElementException;
+
+@RestController
+@RequestMapping("/products")
+public class ProductController {
+    ProductRepository repository;
+
+    public ProductController(ProductRepository repository) {
+        this.repository = repository;
+    }
+
+    public ProductController() {
+        this.repository = new ProductRepository();
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product create(@RequestBody Product product) {
+        Product p = repository.create(product);
+        if (p == null) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists.");
+        }
+        return p;
+    }
+
+    @GetMapping
+    @ResponseStatus(HttpStatus.OK)
+    public List<Product> getAll(@RequestParam(name="category", required=false) String category) {
+        List<Product> products;
+        if (category != null)
+            products = this.repository.findAll(category);
+        else
+            products = this.repository.findAll();
+        if (products.isEmpty())
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No products of the provided category were found.");
+        return products;
+    }
+
+    @GetMapping("/{id}")
+    @ResponseStatus(HttpStatus.OK)
+    public Product getOne(@PathVariable(name="id") int id) {
+        try {
+            return repository.find(id);
+        } catch (NoSuchElementException e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found.");
+        }
+    }
+
+    @PutMapping("/{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product update(@PathVariable(name="id") int id, @RequestBody Product product) {
+        Product updatedProduct;
+        try {
+            updatedProduct = repository.update(id, product);
+        } catch (NoSuchElementException e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found.");
+        }
+        if (updatedProduct == null) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists.");
+        }
+        return updatedProduct;
+    }
+
+    @DeleteMapping("/{id}")
+    @ResponseStatus(HttpStatus.OK)
+    public Product delete(@PathVariable(name="id") int id) {
+        try {
+            return repository.delete(id);
+        } catch (NoSuchElementException e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found.");
+        }
+    }
+}

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

@@ -0,0 +1,74 @@
+package com.booleanuk.api.products;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ProductRepository {
+    private int idCounter = 1;
+    private List<Product> data;
+
+    public ProductRepository() {
+        data = new ArrayList<>();
+        create("Bagel", "Food", 12);
+        create("Apple", "Food", 7);
+    }
+
+    public Product create(String name, String category, int price) {
+        Product product = new Product(this.idCounter++, name, category, price);
+        this.data.add(product);
+        return product;
+    }
+
+    public Product create(Product product) {
+        if (!nameExists(product.getName())) {
+            return this.create(product.getName(), product.getCategory(), product.getPrice());
+        }
+        return null;
+    }
+
+    public List<Product> findAll(String category) {
+        return this.data.stream()
+                .filter(p -> p.getCategory().equals(category))
+                .toList();
+    }
+
+    public List<Product> findAll() {
+        return this.data;
+    }
+
+    public Product find(int id) {
+        return this.data.stream()
+                .filter(product -> product.getId() == id)
+                .findFirst()
+                .orElseThrow();
+    }
+
+    public Product update(int id, Product product) {
+        if (nameExists(product.getName(), id)) {
+            return null;
+        }
+        Product productToUpdate = find(id);
+        productToUpdate.setName(product.getName());
+        productToUpdate.setCategory(product.getCategory());
+        productToUpdate.setPrice(product.getPrice());
+        return productToUpdate;
+    }
+
+    public Product delete(int id) {
+        Product productToDelete = find(id);
+        data.remove(productToDelete);
+        return productToDelete;
+    }
+
+    private boolean nameExists(String name) {
+        return !this.data.stream()
+                .filter(p -> p.getName().equals(name))
+                .toList().isEmpty();
+    }
+
+    private boolean nameExists(String name, int excludeId) {
+        return !this.data.stream()
+                .filter(p -> p.getName().equals(name) && p.getId() != excludeId)
+                .toList().isEmpty();
+    }
+}