| // Lucene version compatibility level 4.8.1 |
| using Lucene.Net.Index; |
| using Lucene.Net.Queries.Function.DocValues; |
| using Lucene.Net.Util; |
| using Lucene.Net.Util.Packed; |
| using System; |
| using System.Collections; |
| using System.IO; |
| |
| 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> |
| /// Use a field value and find the Document Frequency within another field. |
| /// |
| /// @since solr 4.0 |
| /// </summary> |
| public class JoinDocFreqValueSource : FieldCacheSource |
| { |
| public const string NAME = "joindf"; |
| |
| protected readonly string m_qfield; |
| |
| public JoinDocFreqValueSource(string field, string qfield) |
| : base(field) |
| { |
| this.m_qfield = qfield; |
| } |
| |
| public override string GetDescription() |
| { |
| return NAME + "(" + m_field + ":(" + m_qfield + "))"; |
| } |
| |
| public override FunctionValues GetValues(IDictionary context, AtomicReaderContext readerContext) |
| { |
| BinaryDocValues terms = m_cache.GetTerms(readerContext.AtomicReader, m_field, false, PackedInt32s.FAST); |
| IndexReader top = ReaderUtil.GetTopLevelContext(readerContext).Reader; |
| Terms t = MultiFields.GetTerms(top, m_qfield); |
| TermsEnum termsEnum = t == null ? TermsEnum.EMPTY : t.GetEnumerator(); |
| |
| return new Int32DocValuesAnonymousClass(this, this, terms, termsEnum); |
| } |
| |
| private class Int32DocValuesAnonymousClass : Int32DocValues |
| { |
| private readonly JoinDocFreqValueSource outerInstance; |
| |
| private readonly BinaryDocValues terms; |
| private readonly TermsEnum termsEnum; |
| |
| public Int32DocValuesAnonymousClass(JoinDocFreqValueSource outerInstance, JoinDocFreqValueSource @this, BinaryDocValues terms, TermsEnum termsEnum) |
| : base(@this) |
| { |
| this.outerInstance = outerInstance; |
| this.terms = terms; |
| this.termsEnum = termsEnum; |
| @ref = new BytesRef(); |
| } |
| |
| private readonly BytesRef @ref; |
| |
| /// <summary> |
| /// NOTE: This was intVal() in Lucene |
| /// </summary> |
| public override int Int32Val(int doc) |
| { |
| try |
| { |
| terms.Get(doc, @ref); |
| if (termsEnum.SeekExact(@ref)) |
| { |
| return termsEnum.DocFreq; |
| } |
| else |
| { |
| return 0; |
| } |
| } |
| catch (IOException e) |
| { |
| throw new Exception("caught exception in function " + outerInstance.GetDescription() + " : doc=" + doc, e); |
| } |
| } |
| } |
| |
| public override bool Equals(object o) |
| { |
| if (!(o is JoinDocFreqValueSource other)) |
| return false; |
| if (!m_qfield.Equals(other.m_qfield, StringComparison.Ordinal)) |
| { |
| return false; |
| } |
| return base.Equals(other); |
| } |
| |
| public override int GetHashCode() |
| { |
| return m_qfield.GetHashCode() + base.GetHashCode(); |
| } |
| } |
| } |