| 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 == null) |
| { |
| continue; |
| } |
| Terms terms = fields.GetTerms(m_indexedField); |
| if (terms == 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); |
| } |
| } |
| } |