Marcus Ikdal

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 nextId = 1;
+    private final int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product(String name, String category, int price) {
+        this.id = nextId++;
+        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/ProductController.java

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+package com.booleanuk.api;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ResponseStatusException;
+
+@RestController
+@RequestMapping("products")
+public class ProductController {
+    private ProductRepository repo = new ProductRepository();
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product createProduct(@RequestBody Product product) {
+        Product created = repo.create(product);
+        if (created == null) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Product with provided name already exists.");
+        }
+        return created;
+    }
+
+    @GetMapping
+    public List<Product> getProducts(@RequestParam(required = false) String category) {
+        List<Product> result = new ArrayList<>();
+        if (category != null) {
+            result = repo.getCategory(category);
+            if (result == null) {
+                throw new ResponseStatusException(HttpStatus.NOT_FOUND,
+                        "No products of the provided category were found.");
+            }
+        } else {
+            result = repo.getAll();
+        }
+        return result;
+    }
+
+    @GetMapping("/{id}")
+    public Product getSpecificProduct(@PathVariable int id) {
+        Product product = repo.getProduct(id);
+        if (product == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found.");
+        }
+        return product;
+    }
+
+    @PutMapping("/{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product updateProduct(@PathVariable int id, @RequestBody Product updated) {
+        Product product = repo.update(id, updated);
+        if (product == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found.");
+        }
+        return product;
+    }
+
+    @DeleteMapping("/{id}")
+    public Product deleteProduct(@PathVariable int id) {
+        Product product = repo.delete(id);
+        if (product == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product not found.");
+        }
+        return product;
+    }
+
+}

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

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+package com.booleanuk.api;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+
+public class ProductRepository {
+    private List<Product> products = new ArrayList<>() {
+        {
+            add(new Product("How to build APIs", "Book", 1500));
+            add(new Product("Grey bat", "Sports", 3000));
+        }
+    };
+
+    List<Product> getAll() {
+        return products;
+    }
+
+    List<Product> getCategory(String category) {
+        List<Product> filtered = new ArrayList<>();
+        for (Product p : products) {
+            if (p.getCategory().toLowerCase().equals(category.toLowerCase())) {
+                filtered.add(p);
+            }
+        }
+        // return null if no items with this category
+        if (filtered.size() == 0) {
+            return null;
+        }
+        return filtered;
+    }
+
+    Product getProduct(int id) {
+        for (Product p : products) {
+            if (p.getId() == id) {
+                return p;
+            }
+        }
+        return null;
+    }
+
+    Product create(Product product) {
+        // check if product with same name exists
+        for (Product p : products) {
+            if (p.getName().equals(product.getName())) {
+                return null;
+            }
+        }
+
+        products.add(product);
+        return product;
+    }
+
+    Product update(int id, Product updated) {
+        Product product = getProduct(id);
+        if (product != null) {
+            // check if product with updated name already exists
+            for (Product p : products) {
+                if (p.getName().equals(updated.getName())) {
+                    throw new ResponseStatusException(HttpStatus.BAD_REQUEST,
+                            "Product with provided name already exists.");
+                }
+            }
+            product.setName(updated.getName());
+            product.setCategory(updated.getCategory());
+            product.setPrice(updated.getPrice());
+        }
+        return product;
+    }
+
+    Product delete(int id) {
+        for (Product p : products) {
+            if (p.getId() == id) {
+                products.remove(p);
+                return p;
+            }
+        }
+        return null;
+    }
+}