private OpenBitSetDISI initialResult(IndexReader reader, int logic, int[] index)
{
OpenBitSetDISI result;
/**
* First AND operation takes place against a completely false
* bitset and will always return zero results.
*/
if (logic == AND)
{
result = new OpenBitSetDISI(getDISI(chain[index[0]], reader), reader.MaxDoc);
++index[0];
}
else if (logic == ANDNOT)
{
result = new OpenBitSetDISI(getDISI(chain[index[0]], reader), reader.MaxDoc);
result.Flip(0, reader.MaxDoc); // NOTE: may set bits for deleted docs.
++index[0];
}
else
{
result = new OpenBitSetDISI(reader.MaxDoc);
}
return result;
}
/// <summary>
/// Get the id set for the filter.
/// </summary>
/// <param name="reader">The reader.</param>
/// <returns>The filter set to use.</returns>
public override DocIdSet GetDocIdSet(IndexReader reader)
{
OpenBitSetDISI res = null;
if (shouldFilters != null)
{
for (int i = 0; i < shouldFilters.Count; i++)
{
if (res == null)
{
res = new OpenBitSetDISI(GetDISI(shouldFilters, i, reader), reader.MaxDoc());
}
else
{
DocIdSet dis = ((Filter)shouldFilters[i]).GetDocIdSet(reader);
if (dis is OpenBitSet)
{
// optimized case for OpenBitSets
res.Or((OpenBitSet)dis);
}
else
{
res.InPlaceOr(GetDISI(shouldFilters, i, reader));
}
}
}
}
if (notFilters != null)
{
for (int i = 0; i < notFilters.Count; i++)
{
if (res == null)
{
res = new OpenBitSetDISI(GetDISI(notFilters, i, reader), reader.MaxDoc());
res.Flip(0, reader.MaxDoc()); // NOTE: may set bits on deleted docs
}
else
{
DocIdSet dis = ((Filter)notFilters[i]).GetDocIdSet(reader);
if (dis is OpenBitSet)
{
// optimized case for OpenBitSets
res.AndNot((OpenBitSet)dis);
}
else
{
res.InPlaceNot(GetDISI(notFilters, i, reader));
}
}
}
}
if (mustFilters != null)
{
for (int i = 0; i < mustFilters.Count; i++)
{
if (res == null)
{
res = new OpenBitSetDISI(GetDISI(mustFilters, i, reader), reader.MaxDoc());
}
else
{
DocIdSet dis = ((Filter)mustFilters[i]).GetDocIdSet(reader);
if (dis is OpenBitSet)
{
// optimized case for OpenBitSets
res.And((OpenBitSet)dis);
}
else
{
res.InPlaceAnd(GetDISI(mustFilters, i, reader));
}
}
}
}
if (res != null)
return FinalResult(res, reader.MaxDoc());
else
{
//TODO: 2.- change return DocIdSet.EMPTY_DOCIDSET;
return null;
}
}