/
SumTotalTermFreqValueSource.cs
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/
SumTotalTermFreqValueSource.cs
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// Lucene version compatibility level 4.8.1
using Lucene.Net.Index;
using Lucene.Net.Queries.Function.DocValues;
using Lucene.Net.Search;
using System;
using System.Collections;
namespace Lucene.Net.Queries.Function.ValueSources
{
/*
* 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>
/// <see cref="SumTotalTermFreqValueSource"/> returns the number of tokens.
/// (sum of term freqs across all documents, across all terms).
/// Returns -1 if frequencies were omitted for the field, or if
/// the codec doesn't support this statistic.
/// @lucene.internal
/// </summary>
public class SumTotalTermFreqValueSource : ValueSource
{
protected readonly string m_indexedField;
public SumTotalTermFreqValueSource(string indexedField)
{
this.m_indexedField = indexedField;
}
public virtual string Name => "sumtotaltermfreq";
public override string GetDescription()
{
return Name + '(' + m_indexedField + ')';
}
public override FunctionValues GetValues(IDictionary context, AtomicReaderContext readerContext)
{
return (FunctionValues)context[this];
}
public override void CreateWeight(IDictionary context, IndexSearcher searcher)
{
long sumTotalTermFreq = 0;
foreach (AtomicReaderContext readerContext in searcher.TopReaderContext.Leaves)
{
Fields fields = readerContext.AtomicReader.Fields;
if (fields is null)
{
continue;
}
Terms terms = fields.GetTerms(m_indexedField);
if (terms is null)
{
continue;
}
long v = terms.SumTotalTermFreq;
if (v == -1)
{
sumTotalTermFreq = -1;
break;
}
else
{
sumTotalTermFreq += v;
}
}
long ttf = sumTotalTermFreq;
context[this] = new Int64DocValuesAnonymousClass(this, ttf);
}
private class Int64DocValuesAnonymousClass : Int64DocValues
{
private readonly long ttf;
public Int64DocValuesAnonymousClass(SumTotalTermFreqValueSource @this, long ttf)
: base(@this)
{
this.ttf = ttf;
}
/// <summary>
/// NOTE: This was longVal() in Lucene
/// </summary>
public override long Int64Val(int doc)
{
return ttf;
}
}
public override int GetHashCode()
{
return this.GetType().GetHashCode() + m_indexedField.GetHashCode();
}
public override bool Equals(object o)
{
if (!(o is SumTotalTermFreqValueSource other))
return false;
return this.m_indexedField.Equals(other.m_indexedField, StringComparison.Ordinal);
}
}
}