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<?php
class ExtensionPointProviderService
{
const EXTENSION_POINT_PROVIDER_SUFFIX = 'ExtensionPointProvider';
private $loaded_providers;
private $available_providers_ids = array();
public function __construct()
{
$this->loaded_providers = new RAMDataStore();
$this->load_modules_providers();
$this->register_provider('kernel');
$this->register_provider('user');
$this->register_provider('install');
}
public function get_extension_point($extension_point, $authorized_providers_ids = null)
{
$providers = $this->get_providers($extension_point, $authorized_providers_ids);
$extensions_points = array();
foreach ($providers as $provider)
{
$extensions_points[$provider->get_id()] = $provider->get_extension_point($extension_point);
}
return $extensions_points;
}
public function get_providers($extension_point, $authorized_providers_ids = null)
{
if ($authorized_providers_ids === null)
{
$authorized_providers_ids = $this->available_providers_ids;
}
$providers = array();
foreach ($authorized_providers_ids as $extension_provider_id)
{
$provider = $this->get_provider($extension_provider_id);
if ($provider->has_extension_point($extension_point))
{
$providers[$provider->get_id()] = $provider;
}
}
return $providers;
}
public function get_provider($provider_id)
{
if (!$this->loaded_providers->contains($provider_id))
{
if (!$this->provider_exists($provider_id))
{
$this->try_to_reload_modules_providers($provider_id);
}
$classname = $this->compute_provider_classname($provider_id);
$this->loaded_providers->store($provider_id, new $classname());
}
return $this->loaded_providers->get($provider_id);
}
public function provider_exists($provider_id, $extensions_points = null)
{
if (!in_array($provider_id, $this->available_providers_ids))
{
return false;
}
if (!empty($extensions_points))
{
$provider = $this->get_provider($provider_id);
if (is_string($extensions_points))
{
return $provider->has_extension_point($extensions_points);
}
else
{
return $provider->has_extensions_points($extensions_points);
}
}
return true;
}
private function load_modules_providers()
{
try
{
foreach (ModulesManager::get_installed_modules_map() as $provider_id => $module)
{
if ($module->is_activated())
{
$this->register_provider($provider_id);
}
}
}
catch (PHPBoostNotInstalledException $exception) { }
catch (DBConnectionException $exception) { }
catch (SQLQuerierException $exception) { }
catch (IOException $exception) { }
}
private function register_provider($provider_id)
{
if ($this->check_provider($provider_id) && !in_array($provider_id, $this->available_providers_ids))
{
$this->available_providers_ids[] = $provider_id;
}
}
private function check_provider($provider_id)
{
$provider_classname = $this->compute_provider_classname($provider_id);
return ClassLoader::is_class_registered_and_valid($provider_classname);
}
private function compute_provider_classname($provider_id)
{
return TextHelper::ucfirst($provider_id) . self::EXTENSION_POINT_PROVIDER_SUFFIX;
}
private function try_to_reload_modules_providers($provider_id)
{
if (!in_array($provider_id, $this->available_providers_ids))
{
$this->load_modules_providers();
if (!in_array($provider_id, $this->available_providers_ids))
{
throw new UnexistingExtensionPointProviderException($provider_id);
}
}
}
}
?>