/**
* Recupérer une instance de Backend à partir de son Uri, alias ou encore id dans la liste.
*
* @param string|t41_Backend_Uri alias or uri of desired backend
* @return t41\Backend\Adapter\AbstractAdapter Backend Adapter
*/
public static function getInstance($id)
{
if (!is_array(self::$_config)) {
self::loadConfig();
}
if ($id instanceof Backend\BackendUri) {
if ($id->getAlias()) {
return self::getInstance($id->getAlias());
} else {
if ($id->getHost() && $id->getType()) {
// si uri n'est pas un alias mais contient au moins host + type
return self::factory($id);
}
}
} else {
if (substr($id, 0, 1) == self::PREFIX) {
$id = substr($id, 1);
}
/* return already instanciated backend */
if (isset(self::$_backendsObj[$id])) {
return self::$_backendsObj[$id];
}
if (isset(self::$_config[$id])) {
$config = self::$_config[$id];
$uri = array();
/* temp fix - some backends require adapters (PDO), most don't */
if (!isset($config['uri']['adapter'])) {
$uri['adapter'] = $config['type'];
}
/* reduce possible arrays into proper env-based value */
/* @todo use parent value if backend extends some other backend */
foreach ($config['uri'] as $key => $val) {
if (is_array($val)) {
$uri[$key] = isset($val[Core::$env]) ? $val[Core::$env] : null;
} else {
$uri[$key] = $val;
}
}
$uri = new Backend\BackendUri($uri);
$backend = self::factory($uri, $id);
/* @todo refactor this */
if (isset($config['mapper'])) {
if (is_array($config['mapper'])) {
if (isset($config['mapper'][Core::getEnvData('webEnv')])) {
$mapper = $config['mapper'][Core::getEnvData('webEnv')];
} else {
throw new Backend\Exception("NO_MAPPER_VALUE");
}
} else {
$mapper = $config['mapper'];
}
$mapper = Mapper::getInstance($mapper);
$backend->setMapper($mapper);
}
return $backend;
}
}
throw new Backend\Exception('Unknown backend alias: ' . $id . '.');
}
