Going namespaced, going scenario style

app/code/Scenario.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Shikiryu\Backup;
+
+use Shikiryu\Backup\Backup\Factory as BackupFactory;
+use Shikiryu\Backup\Transport\Factory as TransportFactory;
+
+class Scenario {
+
+    private $backup;
+    private $to;
+
+    /**
+     * @param array $scenario
+     */
+    private function __construct(array $scenario)
+    {
+        $this->backup   = BackupFactory::build($scenario['backup']);
+        $this->to       = TransportFactory::build($scenario['to']);
+    }
+
+
+    public static function launch($scenario)
+    {
+        if (is_readable($scenario)) {
+            $scenario = json_decode(file_get_contents($scenario), true);
+            if (static::isValid($scenario)) {
+                $scenario = new self($scenario);
+            }
+            throw new \Exception('invalid scenario.');
+        }
+        throw new \Exception('scenario not found.');
+    }
+
+    public static function isValid(\StdClass $scenario)
+    {
+        return
+            isset($scenario->backup) &&
+            count($scenario->backup) === 1 &&
+            isset($scenario->to) &&
+            count($scenario->to) === 1;
+    }
+
+}