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QueryWrapperFilter.cs
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QueryWrapperFilter.cs
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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"); // LUCENENET specific - changed from IllegalArgumentException to ArgumentNullException (.NET convention)
}
/// <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);
}
}
}