Horde_Imap_Client_Data_Fetch::exists PHP Method

Does this object containing cacheable data of the given type?

public exists ( integer $type ) : boolean
$type	integer	The type to query.
return	boolean	True if the type is cacheable.

    public function exists($type)
    {
        return isset($this->_data[$type]);
    }

Horde_Imap_Client_Data_Fetch