Magnus Krumbacher

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 int id;
+    private String name;
+    private String category;
+    private int price;
+    private static int nextId = 1;
+
+    public Product(String name, String category, int price) {
+        this.name = name;
+        this.category = category;
+        this.price = price;
+        this.id = nextId;
+        nextId++;
+    }
+
+    public int getId() {
+        return 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.nio.channels.ScatteringByteChannel;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+@RestController
+@RequestMapping("products")
+
+public class ProductController {
+    private ProductRepository theProducts;
+
+    public ProductController() {
+        this.theProducts = new ProductRepository();
+    }
+
+    @GetMapping
+    public List<Product> getAll(@RequestParam(required = false) String category) {
+        if (this.theProducts.getAll(category) == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found!");
+        }
+        return this.theProducts.getAll(category);
+    }
+
+    @PostMapping
+    public Product create(@RequestBody Product product) {
+        Product toReturn = this.theProducts.createProduct(product);
+        if (toReturn == null) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Already exists!");
+        }
+        return toReturn;
+    }
+
+    //try-catch not needed at all but I just wanted to try it
+    @GetMapping("/{id}")
+    public Product getOne(@PathVariable(name = "id") int id) {
+        try {
+            return this.theProducts.getOneProduct(id);
+        } catch (NoSuchElementException e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, e.getMessage());
+        }
+    }
+
+    @PutMapping("/{id}")
+    public Product update(@PathVariable(name = "id") int id, @RequestBody Product product) {
+        try {
+            Product toReturn = this.theProducts.updateProduct(id, product);
+            if (toReturn == null) {
+                throw new IllegalArgumentException("Item already exists");
+            }
+            return toReturn;
+        } catch (NoSuchElementException e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, e.getMessage());
+        } catch (IllegalArgumentException e) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, e.getMessage());
+        }
+    }
+
+
+    @DeleteMapping("/{id}")
+    public Product delete(@PathVariable(name = "id") int id) {
+        try {
+            return this.theProducts.deleteProduct(id);
+        } catch (NoSuchElementException e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, e.getMessage());
+        }
+    }
+}

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

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+package com.booleanuk.api.products;
+
+import jdk.jshell.spi.ExecutionControl;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+public class ProductRepository {
+    private List<Product> products;
+
+    public ProductRepository() {
+        this.products = new ArrayList<>();
+    }
+
+    public Product createProduct(Product product) {
+        for (Product sameNameProduct : this.products) {
+            if (product.getName().equals(sameNameProduct.getName())) {
+                return null;
+            }
+        }
+        this.products.add(product);
+        return product;
+    }
+
+    public List<Product> getAll(String category){
+        if (category == null) {
+            return this.products;
+        }
+        List<Product> matchingProducts = new ArrayList<>();
+        for (Product product : this.products) {
+            if (product.getCategory().equals(category)) {
+                matchingProducts.add(product);
+            }
+        }
+        if (matchingProducts.isEmpty()) {
+            return null;
+        }
+        return matchingProducts;
+    }
+
+
+    public Product getOneProduct(int id) throws NoSuchElementException {
+        return this.products.stream()
+                .filter(product -> product.getId() == id)
+                .findFirst()
+                .orElseThrow(NoSuchElementException::new);
+    }
+
+    public Product updateProduct(int id, Product product) {
+        try {
+            Product productToUpdate = this.getOneProduct(id);
+            for (Product sameNameProduct : this.products) {
+                if (product.getName().equals(sameNameProduct.getName())) {
+                    return null;
+                }
+            }
+            productToUpdate.setName(product.getName());
+            productToUpdate.setCategory(product.getCategory());
+            productToUpdate.setPrice(product.getPrice());
+            return productToUpdate;
+        } catch (NoSuchElementException e) {
+            throw e;
+        }
+    }
+
+
+    public Product deleteProduct(int id) {
+        try {
+            Product productToDelete = this.getOneProduct(id);
+            this.products.remove(productToDelete);
+            return productToDelete;
+        } catch (NoSuchElementException e) {
+            throw e;
+        }
+    }
+
+}