| using Lucene.Net.Diagnostics; |
| |
| 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. |
| */ |
| |
| using DocsEnum = Lucene.Net.Index.DocsEnum; |
| using Similarity = Lucene.Net.Search.Similarities.Similarity; |
| |
| /// <summary> |
| /// Expert: A <see cref="Scorer"/> for documents matching a <see cref="Index.Term"/>. |
| /// </summary> |
| internal sealed class TermScorer : Scorer |
| { |
| private readonly DocsEnum docsEnum; |
| private readonly Similarity.SimScorer docScorer; |
| |
| /// <summary> |
| /// Construct a <see cref="TermScorer"/>. |
| /// </summary> |
| /// <param name="weight"> |
| /// The weight of the <see cref="Index.Term"/> in the query. </param> |
| /// <param name="td"> |
| /// An iterator over the documents matching the <see cref="Index.Term"/>. </param> |
| /// <param name="docScorer"> |
| /// The <see cref="Similarity.SimScorer"/> implementation |
| /// to be used for score computations. </param> |
| internal TermScorer(Weight weight, DocsEnum td, Similarity.SimScorer docScorer) |
| : base(weight) |
| { |
| this.docScorer = docScorer; |
| this.docsEnum = td; |
| } |
| |
| public override int DocID => docsEnum.DocID; |
| |
| public override int Freq => docsEnum.Freq; |
| |
| /// <summary> |
| /// Advances to the next document matching the query. |
| /// </summary> |
| /// <returns> The document matching the query or <see cref="DocIdSetIterator.NO_MORE_DOCS"/> if there are no more documents. </returns> |
| public override int NextDoc() |
| { |
| return docsEnum.NextDoc(); |
| } |
| |
| public override float GetScore() |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(DocID != NO_MORE_DOCS); |
| return docScorer.Score(docsEnum.DocID, docsEnum.Freq); |
| } |
| |
| /// <summary> |
| /// Advances to the first match beyond the current whose document number is |
| /// greater than or equal to a given target. |
| /// <para/> |
| /// The implementation uses <see cref="DocIdSetIterator.Advance(int)"/>. |
| /// </summary> |
| /// <param name="target"> |
| /// The target document number. </param> |
| /// <returns> The matching document or <see cref="DocIdSetIterator.NO_MORE_DOCS"/> if none exist. </returns> |
| public override int Advance(int target) |
| { |
| return docsEnum.Advance(target); |
| } |
| |
| public override long GetCost() |
| { |
| return docsEnum.GetCost(); |
| } |
| |
| /// <summary> |
| /// Returns a string representation of this <see cref="TermScorer"/>. </summary> |
| public override string ToString() |
| { |
| return "scorer(" + m_weight + ")"; |
| } |
| } |
| } |