/**
* Gets a reference to the document identified by the given type and identifier
* without actually loading it.
*
* If partial objects are allowed, this method will return a partial object that only
* has its identifier populated. Otherwise a proxy is returned that automatically
* loads itself on first access.
*
* @return object The document reference.
*/
public function getReference($documentName, $identifier)
{
$class = $this->_metadataFactory->getMetadataFor($documentName);
// Check identity map first, if its already in there just return it.
if ($document = $this->_unitOfWork->tryGetById($identifier, $class->rootDocumentName)) {
return $document;
}
$document = $this->_proxyFactory->getProxy($class->name, $identifier);
$this->_unitOfWork->registerManaged($document, $identifier, array());
return $document;
}
/**
* Gets a partial reference to the document identified by the given type and identifier
* without actually loading it, if the document is not yet loaded.
*
* The returned reference may be a partial object if the document is not yet loaded/managed.
* If it is a partial object it will not initialize the rest of the document state on access.
* Thus you can only ever safely access the identifier of an document obtained through
* this method.
*
* The use-cases for partial references involve maintaining bidirectional associations
* without loading one side of the association or to update an document without loading it.
* Note, however, that in the latter case the original (persistent) document data will
* never be visible to the application (especially not event listeners) as it will
* never be loaded in the first place.
*
* @param string $documentName The name of the document type.
* @param mixed $identifier The document identifier.
* @return object The (partial) document reference.
*/
public function getPartialReference($documentName, $identifier)
{
$class = $this->metadataFactory->getMetadataFor($documentName);
// Check identity map first, if its already in there just return it.
if ($document = $this->unitOfWork->tryGetById($identifier, $class->rootDocumentName)) {
return $document;
}
$document = $class->newInstance();
$class->setIdentifierValue($document, $identifier);
$this->unitOfWork->registerManaged($document, $identifier, array());
return $document;
}
