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<?php
/**
* Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC\Hooks;
abstract class BasicEmitter implements Emitter {
/**
* @var (callable[])[] $listeners
*/
protected $listeners = array();
/**
* @param string $scope
* @param string $method
* @param callable $callback
*/
public function listen($scope, $method, $callback) {
$eventName = $scope . '::' . $method;
if (!isset($this->listeners[$eventName])) {
$this->listeners[$eventName] = array();
}
if (array_search($callback, $this->listeners[$eventName]) === false) {
$this->listeners[$eventName][] = $callback;
}
}
/**
* @param string $scope optional
* @param string $method optional
* @param callable $callback optional
*/
public function removeListener($scope = null, $method = null, $callback = null) {
$names = array();
$allNames = array_keys($this->listeners);
if ($scope and $method) {
$name = $scope . '::' . $method;
if (isset($this->listeners[$name])) {
$names[] = $name;
}
} elseif ($scope) {
foreach ($allNames as $name) {
$parts = explode('::', $name, 2);
if ($parts[0] == $scope) {
$names[] = $name;
}
}
} elseif ($method) {
foreach ($allNames as $name) {
$parts = explode('::', $name, 2);
if ($parts[1] == $method) {
$names[] = $name;
}
}
} else {
$names = $allNames;
}
foreach ($names as $name) {
if ($callback) {
$index = array_search($callback, $this->listeners[$name]);
if ($index !== false) {
unset($this->listeners[$name][$index]);
}
} else {
$this->listeners[$name] = array();
}
}
}
/**
* @param string $scope
* @param string $method
* @param array $arguments optional
*/
protected function emit($scope, $method, $arguments = array()) {
$eventName = $scope . '::' . $method;
if (isset($this->listeners[$eventName])) {
foreach ($this->listeners[$eventName] as $callback) {
call_user_func_array($callback, $arguments);
}
}
}
}
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