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<?php
/**
* This class manages the hooks. It basically provides two functions: adding
* slots and emitting signals.
*/
class OC_Hook{
static private $registered = array();
/**
* connects a function to a hook
* @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
*
* This function makes it very easy to connect to use hooks.
*
* TODO: write example
*/
static public 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] = array();
}
// 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] = array();
}
// dont 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][] = array(
"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
*
* Emits a signal. To get data from the slot use references!
*
* TODO: write example
*/
static public function emit( $signalclass, $signalname, $params = array()) {
// 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( array( $i["class"], $i["name"] ), $params );
} catch (Exception $e){
OC_Log::write('hook',
'error while running hook (' . $i["class"] . '::' . $i["name"] . '): '.$e->getMessage(),
OC_Log::ERROR);
}
}
// return true
return true;
}
/**
* clear hooks
* @param string $signalclass
* @param string $signalname
*/
static public function clear($signalclass='', $signalname='') {
if($signalclass) {
if($signalname) {
self::$registered[$signalclass][$signalname]=array();
}else{
self::$registered[$signalclass]=array();
}
}else{
self::$registered=array();
}
}
/**
* DO NOT USE!
* For unit tests ONLY!
*/
static public function getHooks() {
return self::$registered;
}
}
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