PHP7 State

Behavioral/State/OrderRepository.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace DesignPatterns\Behavioral\State;
+
+class OrderRepository
+{
+    /**
+     * @var array
+     */
+    private static $orders = [
+        1 => ['status' => 'created'],
+        2 => ['status' => 'shipping'],
+        3 => ['status' => 'completed'],
+    ];
+
+    public static function findById(int $id): Order
+    {
+        if (!isset(self::$orders[$id])) {
+            throw new \InvalidArgumentException(sprintf('Order with id %d does not exist', $id));
+        }
+
+        $order = self::$orders[$id];
+
+        switch ($order['status']) {
+            case 'created':
+                return new CreateOrder($order);
+            case 'shipping':
+                return new ShippingOrder($order);
+            default:
+                throw new \InvalidArgumentException('Invalid order status given');
+                break;
+        }
+    }
+}