| using System; |
| |
| namespace Lucene.Net.Search |
| { |
| /* |
| * 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. |
| */ |
| |
| using IBits = Lucene.Net.Util.IBits; |
| |
| /// <summary> |
| /// This implementation supplies a filtered <see cref="DocIdSet"/>, that excludes all |
| /// docids which are not in a <see cref="IBits"/> instance. This is especially useful in |
| /// <see cref="Lucene.Net.Search.Filter"/> to apply the <see cref="acceptDocs"/> |
| /// passed to <see cref="Filter.GetDocIdSet(Index.AtomicReaderContext, IBits)"/> before returning the final <see cref="DocIdSet"/>. |
| /// </summary> |
| /// <seealso cref="DocIdSet"/> |
| /// <seealso cref="Lucene.Net.Search.Filter"/> |
| public sealed class BitsFilteredDocIdSet : FilteredDocIdSet |
| { |
| private readonly IBits acceptDocs; |
| |
| /// <summary> |
| /// Convenience wrapper method: If <c>acceptDocs == null</c> it returns the original set without wrapping. </summary> |
| /// <param name="set"> Underlying DocIdSet. If <c>null</c>, this method returns <c>null</c> </param> |
| /// <param name="acceptDocs"> Allowed docs, all docids not in this set will not be returned by this <see cref="DocIdSet"/>. |
| /// If <c>null</c>, this method returns the original set without wrapping. </param> |
| public static DocIdSet Wrap(DocIdSet set, IBits acceptDocs) |
| { |
| return (set == null || acceptDocs == null) ? set : new BitsFilteredDocIdSet(set, acceptDocs); |
| } |
| |
| /// <summary> |
| /// Constructor. </summary> |
| /// <param name="innerSet"> Underlying <see cref="DocIdSet"/> </param> |
| /// <param name="acceptDocs"> Allowed docs, all docids not in this set will not be returned by this <see cref="DocIdSet"/> </param> |
| public BitsFilteredDocIdSet(DocIdSet innerSet, IBits acceptDocs) |
| : base(innerSet) |
| { |
| this.acceptDocs = acceptDocs ?? throw new ArgumentNullException(nameof(acceptDocs), "acceptDocs can not be null"); |
| } |
| |
| protected override bool Match(int docid) |
| { |
| return acceptDocs.Get(docid); |
| } |
| } |
| } |