/**
* Gets the IANA content type (aka media type) of the stream associated with
* the specified media resource.
*
* @param object $entity The entity instance
* (media resource) associated with
* the stream for which the content
* type is to be obtained.
* @param ResourceStreamInfo $resourceStreamInfo This will be null if
* media resource is MLE,
* if media resource is named
* stream then will be the
* ResourceStreamInfo instance
* holding the details of
* named stream.
*
* @return string|null
*/
public function getStreamContentType($entity, $resourceStreamInfo)
{
$contentType = null;
$this->_saveContentTypeAndETag();
if (is_null($resourceStreamInfo)) {
$this->_loadAndValidateStreamProvider();
$contentType = $this->_streamProvider->getStreamContentType($entity, $this->_service->getOperationContext());
if (is_null($contentType)) {
throw new InvalidOperationException(Messages::streamProviderWrapperGetStreamContentTypeReturnsEmptyOrNull());
}
} else {
$this->_loadAndValidateStreamProvider2();
$contentType = $this->_streamProvider->getStreamContentType2($entity, $resourceStreamInfo, $this->_service->getOperationContext());
}
$this->_verifyContentTypeOrETagModified('IDSSP::getStreamContentType');
return $contentType;
}
