| 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 AtomicReaderContext = Lucene.Net.Index.AtomicReaderContext; |
| using IBits = Lucene.Net.Util.IBits; |
| |
| /// <summary> |
| /// Constrains search results to only match those which also match a provided |
| /// query. |
| /// |
| /// <para/> This could be used, for example, with a <see cref="NumericRangeQuery"/> on a suitably |
| /// formatted date field to implement date filtering. One could re-use a single |
| /// <c>CachingWrapperFilter(QueryWrapperFilter)</c> that matches, e.g., only documents modified |
| /// within the last week. This would only need to be reconstructed once per day. |
| /// </summary> |
| public class QueryWrapperFilter : Filter |
| { |
| private readonly Query query; |
| |
| /// <summary> |
| /// Constructs a filter which only matches documents matching |
| /// <paramref name="query"/>. |
| /// </summary> |
| public QueryWrapperFilter(Query query) |
| { |
| this.query = query ?? throw new ArgumentNullException(nameof(query), "Query may not be null"); |
| } |
| |
| /// <summary> |
| /// Returns the inner Query </summary> |
| public Query Query => query; |
| |
| public override DocIdSet GetDocIdSet(AtomicReaderContext context, IBits acceptDocs) |
| { |
| // get a private context that is used to rewrite, createWeight and score eventually |
| AtomicReaderContext privateContext = context.AtomicReader.AtomicContext; |
| Weight weight = (new IndexSearcher(privateContext)).CreateNormalizedWeight(query); |
| return new DocIdSetAnonymousClass(acceptDocs, privateContext, weight); |
| } |
| |
| private class DocIdSetAnonymousClass : DocIdSet |
| { |
| private readonly IBits acceptDocs; |
| private readonly AtomicReaderContext privateContext; |
| private readonly Weight weight; |
| |
| public DocIdSetAnonymousClass(IBits acceptDocs, AtomicReaderContext privateContext, Weight weight) |
| { |
| this.acceptDocs = acceptDocs; |
| this.privateContext = privateContext; |
| this.weight = weight; |
| } |
| |
| public override DocIdSetIterator GetIterator() |
| { |
| return weight.GetScorer(privateContext, acceptDocs); |
| } |
| |
| public override bool IsCacheable => false; |
| } |
| |
| public override string ToString() |
| { |
| return "QueryWrapperFilter(" + query + ")"; |
| } |
| |
| public override bool Equals(object o) |
| { |
| if (!(o is QueryWrapperFilter)) |
| { |
| return false; |
| } |
| return this.query.Equals(((QueryWrapperFilter)o).query); |
| } |
| |
| public override int GetHashCode() |
| { |
| return query.GetHashCode() ^ unchecked((int)0x923F64B9); |
| } |
| } |
| } |