Implementing __set_state for CakeRoute

It helps the applications to cache the routes using var_export when possible.

lib/Cake/Routing/Route/CakeRoute.php

@@ -546,4 +546,22 @@ protected function _writeUrl($params) {
 		return $out;
 	}
 
+	/**
+	 * Set state magic method to support var_export
+	 *
+	 * This method helps for applications that want to implement
+	 * router caching.
+	 *
+	 * @param array $fields
+	 * @return CakeRoute
+	 */
+	public static function __set_state($fields) {
+		$class = function_exists('get_called_class') ? get_called_class() : __CLASS__;
+		$obj = new $class('');
+		foreach ($fields as $field => $value) {
+			$obj->$field = $value;
+		}
+		return $obj;
+	}
+
 }

lib/Cake/Test/Case/Routing/Route/CakeRouteTest.php

@@ -977,4 +977,15 @@ public function testUTF8PatternOnSection() {
 		$this->assertEquals($expected, $result);
 	}
 
+/**
+ * Test for var_export on CakeRoute
+ *
+ * @return void
+ */
+	public function testSetState() {
+		$route = new CakeRoute('/', array('controller' => 'pages', 'action' => 'display', 'home'));
+		$retrievedRoute = eval('return ' . var_export($route, true) . ';');
+		$this->assertEquals($route, $retrievedRoute);
+	}
+
 }