# Package org.apache.lucene.codecs.memory

Term dictionary, DocValues or Postings formats that are read entirely into memory.

- Class Summary
  Class | Description
  --- | ---
  DirectPostingsFormat | Wraps `Lucene99PostingsFormat` format for on-disk storage, but then at read time loads and stores all terms and postings directly in RAM as byte[], int[].
  FSTPostingsFormat | FST term dict + Lucene50PBF
  FSTTermsReader | FST-based terms dictionary reader.
  FSTTermsWriter | FST-based term dict, using metadata as FST output.