## Uses of Class
org.apache.lucene.store.FilterDirectory

Packages that use FilterDirectory
org.apache.lucene.store: Binary i/o API, used for all index data.

### Uses of FilterDirectory in org.apache.lucene.store

Subclasses of FilterDirectory in org.apache.lucene.store
`class` `LockValidatingDirectoryWrapper` This class makes a best-effort check that a provided `Lock` is valid before any destructive filesystem operation.
`class` `NRTCachingDirectory` Wraps a `RAMDirectory` around any provided delegate directory, to be used during NRT search.
`class` `SleepingLockWrapper` Directory that wraps another, and that sleeps and retries if obtaining the lock fails.
`class` `TrackingDirectoryWrapper` A delegating Directory that records which files were written to and deleted.