public abstract class Filter extends Object
Constructor and Description |
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Filter() |
Modifier and Type | Method and Description |
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abstract DocIdSet |
getDocIdSet(AtomicReaderContext context,
Bits acceptDocs)
Creates a
DocIdSet enumerating the documents that should be
permitted in search results. |
public abstract DocIdSet getDocIdSet(AtomicReaderContext context, Bits acceptDocs) throws IOException
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.
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)IOException
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