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## org.apache.lucene.search
Class Filter

    java.lang.Object
      org.apache.lucene.search.Filter

Direct Known Subclasses:
  CachingWrapperFilter, DocTermOrdsRangeFilter, FieldCacheRangeFilter, FieldCacheTermsFilter, FieldValueFilter, MultiTermQueryWrapperFilter, QueryWrapperFilter

    public abstract class Filter

extends Object

Abstract base class for restricting which documents may be returned during searching.

Constructor Summary
`Filter()`

Method Summary
`abstract DocIdSet` | `getDocIdSet(AtomicReaderContext context, Bits acceptDocs)` Creates a `DocIdSet` enumerating the documents that should be permitted in search results.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Filter

    public Filter()

Method Detail

### getDocIdSet

    public abstract DocIdSet getDocIdSet(AtomicReaderContext context,
                                         Bits acceptDocs)
                                  throws IOException

  Creates a `DocIdSet` enumerating the documents that should be permitted in search results. NOTE: null can be returned if no documents are accepted by this Filter.

  Note: This method will be called once per segment in the index during searching. The returned `DocIdSet` must refer to document IDs for that segment, not for the top-level reader.

  Parameters:
    `context` - a `AtomicReaderContext` instance opened on the index currently searched on. Note, it is likely that the provided reader info does not represent the whole underlying index i.e. if the index has more than one segment the given reader only represents a single segment. The provided context is always an atomic context, so you can call `AtomicReader.fields()` on the context's reader, for example.
    `acceptDocs` - Bits that represent the allowable docs to match (typically deleted docs but possibly filtering other documents)
  Returns:
    a DocIdSet that provides the documents which should be permitted or prohibited in search results. NOTE: null can be returned if no documents will be accepted by this Filter.
  Throws:
    `IOException`

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