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<?php /** * @copyright Copyright (c) 2016, ownCloud, Inc. * * @author Bart Visscher <bartv@thisnet.nl> * @author Christoph Wurst <christoph@winzerhof-wurst.at> * @author Jakob Sack <mail@jakobsack.de> * @author Jörn Friedrich Dreyer <jfd@butonic.de> * @author Morris Jobke <hey@morrisjobke.de> * @author Robin Appelman <robin@icewind.nl> * @author Robin McCorkell <robin@mccorkell.me.uk> * @author Sam Tuke <mail@samtuke.com> * @author Thomas Müller <thomas.mueller@tmit.eu> * @author Vincent Petry <vincent@nextcloud.com> * * @license AGPL-3.0 * * This code is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License, version 3, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License, version 3, * along with this program. If not, see <http://www.gnu.org/licenses/> * */ class OC_Hook { public static $thrownExceptions = []; private static $registered = []; /** * connects a function to a hook * * @param string $signalClass class name of emitter * @param string $signalName name of signal * @param string|object $slotClass class name of slot * @param string $slotName name of slot * @return bool * * This function makes it very easy to connect to use hooks. * * TODO: write example */ public static function connect($signalClass, $signalName, $slotClass, $slotName) { // If we're trying to connect to an emitting class that isn't // yet registered, register it if (!array_key_exists($signalClass, self::$registered)) { self::$registered[$signalClass] = []; } // If we're trying to connect to an emitting method that isn't // yet registered, register it with the emitting class if (!array_key_exists($signalName, self::$registered[$signalClass])) { self::$registered[$signalClass][$signalName] = []; } // don't connect hooks twice foreach (self::$registered[$signalClass][$signalName] as $hook) { if ($hook['class'] === $slotClass and $hook['name'] === $slotName) { return false; } } // Connect the hook handler to the requested emitter self::$registered[$signalClass][$signalName][] = [ "class" => $slotClass, "name" => $slotName ]; // No chance for failure ;-) return true; } /** * emits a signal * * @param string $signalClass class name of emitter * @param string $signalName name of signal * @param mixed $params default: array() array with additional data * @return bool true if slots exists or false if not * @throws \OCP\HintException * @throws \OC\ServerNotAvailableException Emits a signal. To get data from the slot use references! * * TODO: write example */ public static function emit($signalClass, $signalName, $params = []) { // Return false if no hook handlers are listening to this // emitting class if (!array_key_exists($signalClass, self::$registered)) { return false; } // Return false if no hook handlers are listening to this // emitting method if (!array_key_exists($signalName, self::$registered[$signalClass])) { return false; } // Call all slots foreach (self::$registered[$signalClass][$signalName] as $i) { try { call_user_func([ $i["class"], $i["name"] ], $params); } catch (Exception $e) { self::$thrownExceptions[] = $e; \OC::$server->getLogger()->logException($e); if ($e instanceof \OCP\HintException) { throw $e; } if ($e instanceof \OC\ServerNotAvailableException) { throw $e; } } } return true; } /** * clear hooks * @param string $signalClass * @param string $signalName */ public static function clear($signalClass = '', $signalName = '') { if ($signalClass) { if ($signalName) { self::$registered[$signalClass][$signalName] = []; } else { self::$registered[$signalClass] = []; } } else { self::$registered = []; } } /** * DO NOT USE! * For unit tests ONLY! */ public static function getHooks() { return self::$registered; } }