114 lines
3 KiB
PHP
114 lines
3 KiB
PHP
<?php
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/**
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* This class manages the hooks. It basically provides two functions: adding
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* slots and emitting signals.
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*/
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class OC_Hook{
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static private $registered = array();
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/**
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* connects a function to a hook
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* @param string $signalclass class name of emitter
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* @param string $signalname name of signal
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* @param string $slotclass class name of slot
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* @param string $slotname name of slot
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* @return bool
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*
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* This function makes it very easy to connect to use hooks.
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*
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* TODO: write example
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*/
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static public function connect( $signalclass, $signalname, $slotclass, $slotname ) {
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// If we're trying to connect to an emitting class that isn't
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// yet registered, register it
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if( !array_key_exists( $signalclass, self::$registered )) {
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self::$registered[$signalclass] = array();
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}
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// If we're trying to connect to an emitting method that isn't
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// yet registered, register it with the emitting class
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if( !array_key_exists( $signalname, self::$registered[$signalclass] )) {
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self::$registered[$signalclass][$signalname] = array();
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}
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// dont connect hooks twice
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foreach (self::$registered[$signalclass][$signalname] as $hook) {
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if ($hook['class'] === $slotclass and $hook['name'] === $slotname) {
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return false;
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}
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}
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// Connect the hook handler to the requested emitter
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self::$registered[$signalclass][$signalname][] = array(
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"class" => $slotclass,
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"name" => $slotname
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);
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// No chance for failure ;-)
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return true;
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}
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/**
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* emits a signal
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* @param string $signalclass class name of emitter
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* @param string $signalname name of signal
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* @param mixed $params default: array() array with additional data
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* @return bool true if slots exists or false if not
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*
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* Emits a signal. To get data from the slot use references!
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*
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* TODO: write example
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*/
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static public function emit( $signalclass, $signalname, $params = array()) {
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// Return false if no hook handlers are listening to this
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// emitting class
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if( !array_key_exists( $signalclass, self::$registered )) {
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return false;
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}
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// Return false if no hook handlers are listening to this
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// emitting method
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if( !array_key_exists( $signalname, self::$registered[$signalclass] )) {
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return false;
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}
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// Call all slots
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foreach( self::$registered[$signalclass][$signalname] as $i ) {
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try {
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call_user_func( array( $i["class"], $i["name"] ), $params );
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} catch (Exception $e){
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OC_Log::write('hook',
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'error while running hook (' . $i["class"] . '::' . $i["name"] . '): '.$e->getMessage(),
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OC_Log::ERROR);
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}
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}
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// return true
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return true;
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}
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/**
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* clear hooks
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* @param string $signalclass
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* @param string $signalname
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*/
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static public function clear($signalclass='', $signalname='') {
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if($signalclass) {
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if($signalname) {
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self::$registered[$signalclass][$signalname]=array();
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}else{
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self::$registered[$signalclass]=array();
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}
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}else{
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self::$registered=array();
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}
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}
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/**
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* DO NOT USE!
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* For unit tests ONLY!
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*/
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static public function getHooks() {
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return self::$registered;
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}
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}
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