Hanna Adenholm

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/controllers/ProductController.java

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+package com.booleanuk.api.controllers;
+
+import com.booleanuk.api.models.Product;
+import com.booleanuk.api.repositories.ProductRepository;
+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> getAll(@RequestParam(name = "category", required = false, defaultValue = "") String category){
+        if(category.isEmpty())
+            return this.theProducts.findAll();
+        List<Product> products = this.theProducts.findAll(category);
+        if (products.isEmpty()){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No products of that category");
+        }
+        return products;
+    }
+
+
+    @GetMapping("/{id}")
+    public Product getOne(@PathVariable(name="id") int id) {
+        Product product = this.theProducts.find(id);
+        if (product == null){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found!");
+        }
+        return product;
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product post(@RequestBody Product product){
+        if (this.theProducts.addProduct(product))
+            return product;
+        throw new ResponseStatusException(HttpStatus.BAD_REQUEST);
+    }
+
+    @PutMapping("/{id}")
+    @ResponseStatus(HttpStatus.CREATED)
+    public Product update(@PathVariable (name = "id") int id, @RequestBody Product product) {
+        Product pr = theProducts.update(id, product);
+        if (pr == null)
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        return pr;
+    }
+
+    @DeleteMapping("/{id}")
+    public Product delete(@PathVariable (name = "id") int id) {
+        Product pr = this.theProducts.delete(id);
+        if (pr == null)
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        return pr;
+    }
+}

src/main/java/com/booleanuk/api/models/Product.java

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+package com.booleanuk.api.models;
+
+public class Product {
+    private static int nextId;
+
+    private int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product(String name, String category, int price) {
+        id = nextId;
+        nextId ++;
+        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;
+    }
+
+    public int getId() {
+        return id;
+    }
+}

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

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+package com.booleanuk.api.repositories;
+
+import com.booleanuk.api.models.Product;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ProductRepository {
+    List<Product> products;
+
+    public ProductRepository() {
+        this.products = new ArrayList<>();
+
+        products.add(new Product("How to buil APIs", "Book", 1500));
+    }
+
+    public boolean addProduct(Product product){
+        for(Product pr: products){
+            if (pr.getName().equals(product.getName()))
+                return false;
+        }
+        products.add(product);
+        return true;
+    }
+
+    public List<Product> findAll() {
+        return products;
+    }
+
+    public List<Product> findAll(String category) {
+        List<Product> foundPr = new ArrayList<>();
+        for (Product pr: products){
+            if (pr.getCategory().equals(category))
+                foundPr.add(pr);
+        }
+        return foundPr;
+    }
+
+    public Product find(int id) {
+        for (Product product : this.products) {
+            if (product.getId() == id) {
+                return product;
+            }
+        }
+        return null;
+    }
+
+    public Product delete(int id){
+        for (Product product : this.products) {
+            if (product.getId() == id) {
+                this.products.remove(product);
+                return product;
+            }
+        }
+        return null;
+    }
+
+    public Product update(int id, Product product ){
+        for (Product pr: products){
+            if (pr.getName().equals(product.getName()))
+                throw new ResponseStatusException(HttpStatus.BAD_REQUEST);
+        }
+        Product product1 = find(id);
+        if (product1 != null){
+            product1.setName(product.getName());
+            product1.setCategory(product.getCategory());
+            product1.setPrice(product.getPrice());
+            return product1;
+        }
+        return null;
+    }
+}