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<?php
/**
 * The Horde_Notification:: class provides a subject-observer pattern for
 * raising and showing messages of different types and to different
 * listeners.
 *
 * Copyright 2001-2012 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @author   Jan Schneider <jan@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @package  Notification
 */
class Horde_Notification
{
    /**
     * Horde_Notification instances.
     *
     * @var Horde_Notification
     */
    static protected $_instances = array();

    /**
     * Returns a reference to the global notification handler, only
     * creating it if it doesn't already exist.
     *
     * This method must be invoked as:
     *   $notification = Horde_Notification::singleton([$stack]);
     *
     * @param string $stack  The name of the message stack to use.
     *
     * return Horde_Notification_Handler  The Horde Notification handler.
     */
    static public function singleton($stack = 'horde_notification_stacks')
    {
        if (!isset(self::$_instances[$stack])) {
            self::$_instances[$stack] = new Horde_Notification_Handler(new Horde_Notification_Storage_Session($stack));
        }

        return self::$_instances[$stack];
    }

}