public abstract class Filter extends Object implements Serializable
|Constructor and Description|
|Modifier and Type||Method and Description|
public abstract DocIdSet getDocIdSet(IndexReader reader) throws IOException
DocIdSetenumerating 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
must refer to document IDs for that segment, not for
the top-level reader.
IndexReaderinstance opened on the index currently searched on. Note, it is likely that the provided reader 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.