nextcloud/lib/hook.php

101 lines
2.8 KiB
PHP
Raw Normal View History

2011-07-27 21:07:28 +04:00
<?php
/**
* This class manages the hooks. It basically provides two functions: adding
* slots and emitting signals.
*/
2011-07-29 23:36:03 +04:00
class OC_Hook{
2011-07-27 21:07:28 +04:00
static private $registered = array();
/**
* @brief connects a function to a hook
2012-09-23 04:39:11 +04:00
* @param string $signalclass class name of emitter
* @param string $signalname name of signal
* @param string $slotclass class name of slot
* @param string $slotname name of slot
* @return bool
2011-07-27 21:07:28 +04:00
*
* This function makes it very easy to connect to use hooks.
*
* TODO: write example
*/
2012-09-07 17:22:01 +04:00
static public function connect( $signalclass, $signalname, $slotclass, $slotname ) {
2013-02-06 21:43:03 +04:00
// If we're trying to connect to an emitting class that isn't
// yet registered, register it
2012-09-07 17:22:01 +04:00
if( !array_key_exists( $signalclass, self::$registered )) {
2011-07-27 21:07:28 +04:00
self::$registered[$signalclass] = array();
}
2013-02-06 21:43:03 +04:00
// 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[$signalclass] )) {
2011-07-27 21:07:28 +04:00
self::$registered[$signalclass][$signalname] = array();
}
2013-02-06 21:43:03 +04:00
// Connect the hook handler to the requested emitter
2011-07-27 21:07:28 +04:00
self::$registered[$signalclass][$signalname][] = array(
2013-02-10 01:44:11 +04:00
"class" => $slotclass,
"name" => $slotname
);
2013-02-06 21:43:03 +04:00
2011-07-27 21:07:28 +04:00
// No chance for failure ;-)
return true;
}
/**
2012-09-23 04:39:11 +04:00
* @brief emits a signal
* @param string $signalclass class name of emitter
* @param string $signalname name of signal
* @param array $params defautl: array() array with additional data
* @return bool, true if slots exists or false if not
2011-07-27 21:07:28 +04:00
*
* Emits a signal. To get data from the slot use references!
*
* TODO: write example
*/
2012-09-07 17:22:01 +04:00
static public function emit( $signalclass, $signalname, $params = array()) {
2013-02-06 21:43:03 +04:00
// Return false if no hook handlers are listening to this
// emitting class
2012-09-07 17:22:01 +04:00
if( !array_key_exists( $signalclass, self::$registered )) {
2011-07-27 21:07:28 +04:00
return false;
}
2013-02-06 21:43:03 +04:00
// Return false if no hook handlers are listening to this
// emitting method
2012-09-07 17:22:01 +04:00
if( !array_key_exists( $signalname, self::$registered[$signalclass] )) {
2011-07-27 21:07:28 +04:00
return false;
}
2013-02-06 21:43:03 +04:00
2011-07-27 21:07:28 +04:00
// Call all slots
2012-09-07 17:22:01 +04:00
foreach( self::$registered[$signalclass][$signalname] as $i ) {
try {
call_user_func( array( $i["class"], $i["name"] ), $params );
} catch (Exception $e){
2013-02-11 20:44:02 +04:00
OC_Log::write('hook',
'error while running hook (' . $i["class"] . '::' . $i["name"] . '): '.$e->getMessage(),
OC_Log::ERROR);
}
2011-07-27 21:07:28 +04:00
}
// return true
return true;
}
2012-05-11 22:33:23 +04:00
/**
* clear hooks
2012-09-23 04:39:11 +04:00
* @param string $signalclass
* @param string $signalname
2012-05-11 22:33:23 +04:00
*/
2012-09-07 17:22:01 +04:00
static public function clear($signalclass='', $signalname='') {
if($signalclass) {
if($signalname) {
2012-05-11 22:33:23 +04:00
self::$registered[$signalclass][$signalname]=array();
}else{
self::$registered[$signalclass]=array();
}
}else{
self::$registered=array();
}
}
2011-07-27 21:07:28 +04:00
}