Checkes whether the this contains an object with the given uid and rid.
The rid can be an empty string or null to search for the master object, otherwise the
check is done for a detached instance, not for a recurrence instance.
| this |
an CalCache |
| uid |
component UID |
| rid |
optional component Recurrence-ID or null |
| deleted_flag |
one of CacheDeletedFlag enum |
|
Whether the object had been found. |