private FixedBitSet FastBits(AtomicReader reader, Bits acceptDocs)
{
FixedBitSet bits = new FixedBitSet(reader.MaxDoc);
bits.Set(0, reader.MaxDoc); //assume all are valid
Terms terms = reader.Fields.Terms(fieldName);
if (terms == null)
{
return bits;
}
TermsEnum termsEnum = terms.Iterator(null);
DocsEnum docs = null;
while (true)
{
BytesRef currTerm = termsEnum.Next();
if (currTerm == null)
{
break;
}
else
{
if (termsEnum.DocFreq() > 1)
{
// unset potential duplicates
docs = termsEnum.Docs(acceptDocs, docs, DocsEnum.FLAG_NONE);
int doc = docs.NextDoc();
if (doc != DocIdSetIterator.NO_MORE_DOCS)
{
if (keepMode == KeepMode.KM_USE_FIRST_OCCURRENCE)
{
doc = docs.NextDoc();
}
}
int lastDoc = -1;
while (true)
{
lastDoc = doc;
bits.Clear(lastDoc);
doc = docs.NextDoc();
if (doc == DocIdSetIterator.NO_MORE_DOCS)
{
break;
}
}
if (keepMode == KeepMode.KM_USE_LAST_OCCURRENCE)
{
// restore the last bit
bits.Set(lastDoc);
}
}
}
}
return bits;
}
public DocumentFilteredAtomicIndexReader(AtomicReaderContext context, Filter preserveFilter, bool negateFilter)
: base(context.AtomicReader)
{
int maxDoc = @in.MaxDoc;
FixedBitSet bits = new FixedBitSet(maxDoc);
// ignore livedocs here, as we filter them later:
DocIdSet docs = preserveFilter.GetDocIdSet(context, null);
if (docs != null)
{
DocIdSetIterator it = docs.GetIterator();
if (it != null)
{
bits.Or(it);
}
}
if (negateFilter)
{
bits.Flip(0, maxDoc);
}
if (@in.HasDeletions)
{
Bits oldLiveDocs = @in.LiveDocs;
Debug.Assert(oldLiveDocs != null);
DocIdSetIterator it = bits.GetIterator();
for (int i = it.NextDoc(); i < maxDoc; i = it.NextDoc())
{
if (!oldLiveDocs.Get(i))
{
// we can safely modify the current bit, as the iterator already stepped over it:
bits.Clear(i);
}
}
}
this.liveDocs = bits;
this.numDocs_Renamed = bits.Cardinality();
}
