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FixedBitSetCachingWrapperFilter.cs
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FixedBitSetCachingWrapperFilter.cs
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// Lucene version compatibility level 4.8.1
using Lucene.Net.Index;
using Lucene.Net.Util;
namespace Lucene.Net.Search.Join
{
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/// <summary>
/// A <see cref="CachingWrapperFilter"/> that caches sets using a <see cref="FixedBitSet"/>,
/// as required for joins.
/// </summary>
public sealed class FixedBitSetCachingWrapperFilter : CachingWrapperFilter
{
/// <summary>
/// Sole constructor, see <see cref="CachingWrapperFilter.CachingWrapperFilter(Filter)"/>.
/// </summary>
public FixedBitSetCachingWrapperFilter(Filter filter)
: base(filter)
{
}
protected override DocIdSet DocIdSetToCache(DocIdSet docIdSet, AtomicReader reader)
{
if (docIdSet is null)
{
return EMPTY_DOCIDSET;
}
if (docIdSet is FixedBitSet)
{
// this is different from CachingWrapperFilter: even when the DocIdSet is
// cacheable, we convert it to a FixedBitSet since we require all the
// cached filters to be FixedBitSets
return docIdSet;
}
DocIdSetIterator it = docIdSet.GetIterator();
if (it is null)
{
return EMPTY_DOCIDSET;
}
FixedBitSet copy = new FixedBitSet(reader.MaxDoc);
copy.Or(it);
return copy;
}
}
}