/// <summary>Provide the DocIdSet to be cached, using the DocIdSet provided
/// by the wrapped Filter.
/// This implementation returns the given DocIdSet.
/// </summary>
protected internal virtual DocIdSet DocIdSetToCache(DocIdSet docIdSet, IndexReader reader)
{
if (docIdSet == null)
{
// this is better than returning null, as the nonnull result can be cached
return(DocIdSet.EMPTY_DOCIDSET);
}
else if (docIdSet.IsCacheable())
{
return(docIdSet);
}
else
{
DocIdSetIterator it = docIdSet.Iterator();
// null is allowed to be returned by iterator(),
// in this case we wrap with the empty set,
// which is cacheable.
return((it == null) ? DocIdSet.EMPTY_DOCIDSET : new OpenBitSetDISI(it, reader.MaxDoc()));
}
}
/// <summary>This DocIdSet implementation is cacheable if the inner set is cacheable. </summary>
public override bool IsCacheable()
{
return(_innerSet.IsCacheable());
}
/// <summary>Provide the DocIdSet to be cached, using the DocIdSet provided
/// by the wrapped Filter.
/// This implementation returns the given DocIdSet.
/// </summary>
protected internal virtual DocIdSet DocIdSetToCache(DocIdSet docIdSet, IndexReader reader)
{
if (docIdSet == null)
{
// this is better than returning null, as the nonnull result can be cached
return DocIdSet.EMPTY_DOCIDSET;
}
else if (docIdSet.IsCacheable()) {
return docIdSet;
}
else
{
DocIdSetIterator it = docIdSet.Iterator();
// null is allowed to be returned by iterator(),
// in this case we wrap with the empty set,
// which is cacheable.
return (it == null) ? DocIdSet.EMPTY_DOCIDSET : new OpenBitSetDISI(it, reader.MaxDoc());
}
}
