/**
* Returns an identifier object.
*
* Accepts various types of parameters and returns a valid identifier. Parameters can either be an
* object that implements KObjectInterface, or a KObjectIdentifier object, or valid identifier
* string. Function recursively resolves identifier aliases and returns the aliased identifier.
*
* If the identifier does not have a type set default type to 'lib'. Eg, event.publisher is the same as
* lib:event.publisher.
*
* If no identifier is passed the object identifier of this object will be returned.
*
* @param mixed $identifier An KObjectIdentifier, identifier string or object implementing KObjectInterface
* @return KObjectIdentifier
* @throws KObjectExceptionInvalidIdentifier If the identifier is not valid
*/
public function getIdentifier($identifier = null)
{
//Get the identifier
if (isset($identifier)) {
if (!$identifier instanceof KObjectIdentifierInterface) {
if ($identifier instanceof KObjectInterface) {
$identifier = $identifier->getIdentifier();
} else {
$identifier = new KObjectIdentifier($identifier);
}
}
//Get the identifier object
if (!($result = $this->__registry->find($identifier))) {
$result = $this->__registry->set($identifier);
}
} else {
$result = $this->__object_identifier;
}
return $result;
}
