working on routing architecture.

system/routing/filter.php

@@ -7,7 +7,28 @@ class Filter {
 	 *
 	 * @var array
 	 */
-	public static $filters;
+	private static $filters = array();
+
+	/**
+	 * Register a set of route filters.
+	 *
+	 * @param  array  $filters
+	 * @return void
+	 */
+	public static function register($filters)
+	{
+		static::$filters = array_merge(static::$filters, $filters);
+	}
+
+	/**
+	 * Clear all of the registered route filters.
+	 *
+	 * @return void
+	 */
+	public static function clear()
+	{
+		static::$filters = array();
+	}
 
 	/**
 	 * Call a set of route filters.
@@ -19,11 +40,6 @@ class Filter {
 	 */
 	public static function call($filters, $parameters = array(), $override = false)
 	{
-		if (is_null(static::$filters))
-		{
-			static::$filters = require APP_PATH.'filters'.EXT;
-		}
-
 		foreach (explode(', ', $filters) as $filter)
 		{
 			if ( ! isset(static::$filters[$filter]))
@@ -33,6 +49,9 @@ class Filter {
 
 			$response = call_user_func_array(static::$filters[$filter], $parameters);
 
+			// "Before" filters may override the request cycle. For example, an authentication
+			// filter may redirect a user to a login view if they are not logged in. Because of
+			// this, we will return the first filter response if overriding is enabled.
 			if ( ! is_null($response) and $override)
 			{
 				return $response;