| // 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.Function |
| { |
| /* |
| * 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="Scorer"/> which returns the result of <see cref="FunctionValues.SingleVal(int)"/> as |
| /// the score for a document. |
| /// </summary> |
| public class ValueSourceScorer : Scorer |
| { |
| protected readonly IndexReader m_reader; |
| private int doc = -1; |
| protected readonly int m_maxDoc; |
| protected readonly FunctionValues m_values; |
| protected bool m_checkDeletes; |
| private readonly IBits liveDocs; |
| |
| protected internal ValueSourceScorer(IndexReader reader, FunctionValues values) |
| : base(null) |
| { |
| this.m_reader = reader; |
| this.m_maxDoc = reader.MaxDoc; |
| this.m_values = values; |
| SetCheckDeletes(true); |
| this.liveDocs = MultiFields.GetLiveDocs(reader); |
| } |
| |
| public virtual IndexReader Reader => m_reader; |
| |
| public virtual void SetCheckDeletes(bool checkDeletes) |
| { |
| this.m_checkDeletes = checkDeletes && m_reader.HasDeletions; |
| } |
| |
| public virtual bool Matches(int doc) |
| { |
| return (!m_checkDeletes || liveDocs.Get(doc)) && MatchesValue(doc); |
| } |
| |
| public virtual bool MatchesValue(int doc) |
| { |
| return true; |
| } |
| |
| public override int DocID => doc; |
| |
| public override int NextDoc() |
| { |
| for (; ; ) |
| { |
| doc++; |
| if (doc >= m_maxDoc) |
| { |
| return doc = NO_MORE_DOCS; |
| } |
| if (Matches(doc)) |
| { |
| return doc; |
| } |
| } |
| } |
| |
| public override int Advance(int target) |
| { |
| // also works fine when target==NO_MORE_DOCS |
| doc = target - 1; |
| return NextDoc(); |
| } |
| |
| public override float GetScore() |
| { |
| return m_values.SingleVal(doc); |
| } |
| |
| public override int Freq => 1; |
| |
| public override long GetCost() |
| { |
| return m_maxDoc; |
| } |
| |
| /// <summary> |
| /// This class may be used to create <see cref="ValueSourceScorer"/> instances anonymously. |
| /// </summary> |
| // LUCENENET specific - used to mimick the inline class behavior in Java. |
| internal class AnonymousValueSourceScorer : ValueSourceScorer |
| { |
| private readonly Func<int, bool> matchesValue; |
| |
| public AnonymousValueSourceScorer(IndexReader reader, FunctionValues functionValues, Func<int, bool> matchesValue) |
| : base(reader, functionValues) |
| { |
| this.matchesValue = matchesValue ?? throw new ArgumentNullException(nameof(matchesValue)); |
| } |
| |
| public override bool MatchesValue(int doc) |
| { |
| return matchesValue == null ? base.MatchesValue(doc) : matchesValue(doc); |
| } |
| } |
| } |
| } |