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* * @param Observer $observer The observer to check if it's attached * * @return boolean */ public function hasObserver(Observer $observer) { $className = get_class($observer); return $this->hasObserverClass($className); } /** * Is there an observer of the specified class already registered with this dispatcher? * * @param string $className The observer class name to check if it's attached * * @return boolean */ public function hasObserverClass($className) { return isset($this->observers[$className]); } /** * Returns an observer attached to this behaviours dispatcher by its class name * * @param string $className The class name of the observer object to return * * @return null|Observer */ public function getObserverByClass($className) { if (!$this->hasObserverClass($className)) { return null; } return $this->observers[$className]; } /** * Triggers an event in the attached observers * * @param string $event The event to attach * @param array $args Arguments to the event handler * * @return array */ public function trigger($event, array $args = array()) { $event = strtolower($event); $result = array(); // Make sure the event is known to us, otherwise return an empty array if (!isset($this->events[$event]) || empty($this->events[$event])) { return $result; } foreach ($this->events[$event] as $className) { // Make sure the observer exists. if (!isset($this->observers[$className])) { continue; } // Get the observer $observer = $this->observers[$className]; // Make sure the method exists if (!method_exists($observer, $event)) { continue; } // Call the event handler and add its output to the return value. The switch allows for execution up to 2x // faster than using call_user_func_array switch (count($args)) { case 0: $result[] = $observer->{$event}(); break; case 1: $result[] = $observer->{$event}($args[0]); break; case 2: $result[] = $observer->{$event}($args[0], $args[1]); break; case 3: $result[] = $observer->{$event}($args[0], $args[1], $args[2]); break; case 4: $result[] = $observer->{$event}($args[0], $args[1], $args[2], $args[3]); break; case 5: $result[] = $observer->{$event}($args[0], $args[1], $args[2], $args[3], $args[4]); break; default: $result[] = call_user_func_array(array($observer, $event), $args); break; } } // Return the observers' result in an array return $result; } /** * Asks each observer to handle an event based on the provided arguments. The first observer to return a non-null * result wins. This is a *very* simplistic implementation of the Chain of Command pattern. * * @param string $event The event name to handle * @param array $args The arguments to the event * * @return mixed Null if the event can't be handled by any observer */ public function chainHandle($event, $args = array()) { $event = strtolower($event); $result = null; // Make sure the event is known to us, otherwise return an empty array if (!isset($this->events[$event]) || empty($this->events[$event])) { return $result; } foreach ($this->events[$event] as $className) { // Make sure the observer exists. if (!isset($this->observers[$className])) { continue; } // Get the observer $observer = $this->observers[$className]; // Make sure the method exists if (!method_exists($observer, $event)) { continue; } // Call the event handler and add its output to the return value. The switch allows for execution up to 2x // faster than using call_user_func_array switch (count($args)) { case 0: $result = $observer->{$event}(); break; case 1: $result = $observer->{$event}($args[0]); break; case 2: $result = $observer->{$event}($args[0], $args[1]); break; case 3: $result = $observer->{$event}($args[0], $args[1], $args[2]); break; case 4: $result = $observer->{$event}($args[0], $args[1], $args[2], $args[3]); break; case 5: $result = $observer->{$event}($args[0], $args[1], $args[2], $args[3], $args[4]); break; default: $result = call_user_func_array(array($observer, $event), $args); break; } if (!is_null($result)) { return $result; } } // Return the observers' result in an array return $result; } }