/// <exception cref="IOException"/>
private void DoChain(FixedBitSet result, int logic, DocIdSet dis)
{
if (dis is FixedBitSet)
{
// optimized case for FixedBitSets
switch (logic)
{
case OR:
result.Or((FixedBitSet)dis);
break;
case AND:
result.And((FixedBitSet)dis);
break;
case ANDNOT:
result.AndNot((FixedBitSet)dis);
break;
case XOR:
result.Xor((FixedBitSet)dis);
break;
default:
DoChain(result, DEFAULT, dis);
break;
}
}
else
{
DocIdSetIterator disi;
if (dis == null)
{
disi = DocIdSetIterator.GetEmpty();
}
else
{
disi = dis.GetIterator() ?? DocIdSetIterator.GetEmpty();
}
switch (logic)
{
case OR:
result.Or(disi);
break;
case AND:
result.And(disi);
break;
case ANDNOT:
result.AndNot(disi);
break;
case XOR:
result.Xor(disi);
break;
default:
DoChain(result, DEFAULT, dis);
break;
}
}
}