/**
* Retrieve an entity by an index
*
* @param string $class_name
* @param string $index_name
* @param string $index_key
* @param bool $use_cache
* @return object
*/
public function retrieveByIndex($class_name, $index_name, $index_key, $use_cache = true)
{
$metadata = $this->mapper->getEntityMetadata($class_name);
$index = $metadata->getIndexByName($index_name);
if (!$index) {
throw new InvalidArgumentException('Index "' . $index_name . '" is not valid');
}
$id = $this->driver->getSingleValueIndex($this->key_scheme->getIndexKey($index, $index_key));
if (!$id) {
throw new NotFoundException('Index "' . $index_key . '" not found');
}
return $this->retrieve($class_name, $id, $use_cache);
}
