# Package org.hibernate.search.filter.impl

- Class Summary
  Class | Description
  --- | ---
  AndDocIdSet | A DocIdSet built as applying "AND" operation to a list of other DocIdSet(s).
  CachingWrapperQuery | A slightly different version of Lucene's original `CachingWrapperQuery` which uses `SoftReferences` instead of `WeakReferences` in order to cache the filter `DocIdSet`.
  DefaultFilterKey | A `FilterKey` based on the name of a filter definition and the name/value pairs passed to a given instantiation of that definition.
  FullTextFilterImpl |
  MRUFilterCachingStrategy | Keep the most recently used Filters in the cache The cache is at least as big as `hibernate.search.filter.cache_strategy.size` Above this limit, Filters are kept as soft references

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