| using Lucene.Net.Diagnostics; |
| using System.Collections.Generic; |
| |
| namespace Lucene.Net.Search |
| { |
| /* |
| * 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 <see cref="Scorer"/> for queries with a required part and an optional part. |
| /// Delays SkipTo() on the optional part until a GetScore() is needed. |
| /// <para/> |
| /// This <see cref="Scorer"/> implements <see cref="DocIdSetIterator.Advance(int)"/>. |
| /// </summary> |
| internal class ReqOptSumScorer : Scorer |
| { |
| /// <summary> |
| /// The scorers passed from the constructor. |
| /// These are set to <c>null</c> as soon as their Next() or SkipTo() returns <c>false</c>. |
| /// </summary> |
| private Scorer reqScorer; |
| |
| private Scorer optScorer; |
| |
| /// <summary> |
| /// Construct a <see cref="ReqOptSumScorer"/>. </summary> |
| /// <param name="reqScorer"> The required scorer. This must match. </param> |
| /// <param name="optScorer"> The optional scorer. This is used for scoring only. </param> |
| public ReqOptSumScorer(Scorer reqScorer, Scorer optScorer) |
| : base(reqScorer.m_weight) |
| { |
| if (Debugging.AssertsEnabled) |
| { |
| Debugging.Assert(reqScorer != null); |
| Debugging.Assert(optScorer != null); |
| } |
| this.reqScorer = reqScorer; |
| this.optScorer = optScorer; |
| } |
| |
| public override int NextDoc() |
| { |
| return reqScorer.NextDoc(); |
| } |
| |
| public override int Advance(int target) |
| { |
| return reqScorer.Advance(target); |
| } |
| |
| public override int DocID => reqScorer.DocID; |
| |
| /// <summary> |
| /// Returns the score of the current document matching the query. |
| /// Initially invalid, until <see cref="NextDoc()"/> is called the first time. </summary> |
| /// <returns> The score of the required scorer, eventually increased by the score |
| /// of the optional scorer when it also matches the current document. </returns> |
| public override float GetScore() |
| { |
| // TODO: sum into a double and cast to float if we ever send required clauses to BS1 |
| int curDoc = reqScorer.DocID; |
| float reqScore = reqScorer.GetScore(); |
| if (optScorer == null) |
| { |
| return reqScore; |
| } |
| |
| int optScorerDoc = optScorer.DocID; |
| if (optScorerDoc < curDoc && (optScorerDoc = optScorer.Advance(curDoc)) == NO_MORE_DOCS) |
| { |
| optScorer = null; |
| return reqScore; |
| } |
| |
| return optScorerDoc == curDoc ? reqScore + optScorer.GetScore() : reqScore; |
| } |
| |
| public override int Freq |
| { |
| get |
| { |
| // we might have deferred advance() |
| GetScore(); |
| return (optScorer != null && optScorer.DocID == reqScorer.DocID) ? 2 : 1; |
| } |
| } |
| |
| public override ICollection<ChildScorer> GetChildren() |
| { |
| List<ChildScorer> children = new List<ChildScorer>(2); |
| children.Add(new ChildScorer(reqScorer, "MUST")); |
| children.Add(new ChildScorer(optScorer, "SHOULD")); |
| return children; |
| } |
| |
| public override long GetCost() |
| { |
| return reqScorer.GetCost(); |
| } |
| } |
| } |