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TermFilter.cs
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TermFilter.cs
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// Lucene version compatibility level 4.8.1
using Lucene.Net.Index;
using Lucene.Net.Search;
using Lucene.Net.Util;
using System;
namespace Lucene.Net.Queries
{
/*
* 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 filter that includes documents that match with a specific term.
/// </summary>
public sealed class TermFilter : Filter
{
private readonly Term term;
/// <param name="term"> The term documents need to have in order to be a match for this filter. </param>
public TermFilter(Term term)
{
if (term is null)
{
throw new ArgumentNullException(nameof(term), "Term must not be null"); // LUCENENET specific - changed from IllegalArgumentException to ArgumentNullException (.NET convention)
}
else if (term.Field is null)
{
throw new ArgumentNullException(nameof(term.Field), "term.Field must not be null"); // LUCENENET specific - changed from IllegalArgumentException to ArgumentNullException (.NET convention)
}
this.term = term;
}
/// <summary> Gets the term this filter includes documents with. </summary>
public Term Term => term;
public override DocIdSet GetDocIdSet(AtomicReaderContext context, IBits acceptDocs)
{
Terms terms = context.AtomicReader.GetTerms(term.Field);
if (terms == null)
{
return null;
}
TermsEnum termsEnum = terms.GetEnumerator();
if (!termsEnum.SeekExact(term.Bytes))
{
return null;
}
return new DocIdSetAnonymousClass(acceptDocs, termsEnum);
}
private class DocIdSetAnonymousClass : DocIdSet
{
private readonly IBits acceptDocs;
private readonly TermsEnum termsEnum;
public DocIdSetAnonymousClass(IBits acceptDocs, TermsEnum termsEnum)
{
this.acceptDocs = acceptDocs;
this.termsEnum = termsEnum;
}
public override DocIdSetIterator GetIterator()
{
return termsEnum.Docs(acceptDocs, null, DocsFlags.NONE);
}
}
public override bool Equals(object o)
{
if (this == o)
{
return true;
}
if (o == null || this.GetType() != o.GetType())
{
return false;
}
TermFilter that = (TermFilter)o;
if (term != null ? !term.Equals(that.term) : that.term != null)
{
return false;
}
return true;
}
public override int GetHashCode()
{
return term != null ? term.GetHashCode() : 0;
}
public override string ToString()
{
return term.Field + ":" + term.Text;
}
}
}