| using Lucene.Net.Index; |
| using Lucene.Net.Search; |
| using Lucene.Net.Support; |
| using Lucene.Net.Util; |
| using System.Collections; |
| using System.Collections.Generic; |
| using System.Text; |
| |
| 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> |
| /// Query that is boosted by a <see cref="Function.ValueSource"/> |
| /// </summary> |
| // TODO: BoostedQuery and BoostingQuery in the same module? |
| // something has to give |
| public class BoostedQuery : Query |
| { |
| private Query q; |
| private readonly ValueSource boostVal; // optional, can be null |
| |
| public BoostedQuery(Query subQuery, ValueSource boostVal) |
| { |
| this.q = subQuery; |
| this.boostVal = boostVal; |
| } |
| |
| public virtual Query Query |
| { |
| get |
| { |
| return q; |
| } |
| } |
| public virtual ValueSource ValueSource |
| { |
| get |
| { |
| return boostVal; |
| } |
| } |
| |
| public override Query Rewrite(IndexReader reader) |
| { |
| var newQ = q.Rewrite(reader); |
| if (Equals(newQ, q)) |
| { |
| return this; |
| } |
| var bq = (BoostedQuery)this.MemberwiseClone(); |
| bq.q = newQ; |
| return bq; |
| } |
| |
| public override void ExtractTerms(ISet<Term> terms) |
| { |
| q.ExtractTerms(terms); |
| } |
| |
| public override Weight CreateWeight(IndexSearcher searcher) |
| { |
| return new BoostedQuery.BoostedWeight(this, searcher); |
| } |
| |
| private class BoostedWeight : Weight |
| { |
| private readonly BoostedQuery outerInstance; |
| |
| private readonly IndexSearcher searcher; |
| internal readonly Weight qWeight; |
| internal readonly IDictionary fcontext; |
| |
| public BoostedWeight(BoostedQuery outerInstance, IndexSearcher searcher) |
| { |
| this.outerInstance = outerInstance; |
| this.searcher = searcher; |
| this.qWeight = outerInstance.q.CreateWeight(searcher); |
| this.fcontext = ValueSource.NewContext(searcher); |
| outerInstance.boostVal.CreateWeight(fcontext, searcher); |
| } |
| |
| public override Query Query |
| { |
| get |
| { |
| return outerInstance; |
| } |
| } |
| |
| public override float GetValueForNormalization() |
| { |
| float sum = qWeight.GetValueForNormalization(); |
| sum *= outerInstance.Boost * outerInstance.Boost; |
| return sum; |
| } |
| |
| public override void Normalize(float norm, float topLevelBoost) |
| { |
| topLevelBoost *= outerInstance.Boost; |
| qWeight.Normalize(norm, topLevelBoost); |
| } |
| |
| public override Scorer GetScorer(AtomicReaderContext context, IBits acceptDocs) |
| { |
| Scorer subQueryScorer = qWeight.GetScorer(context, acceptDocs); |
| if (subQueryScorer == null) |
| { |
| return null; |
| } |
| return new BoostedQuery.CustomScorer(outerInstance, context, this, outerInstance.Boost, subQueryScorer, outerInstance.boostVal); |
| } |
| |
| public override Explanation Explain(AtomicReaderContext readerContext, int doc) |
| { |
| Explanation subQueryExpl = qWeight.Explain(readerContext, doc); |
| if (!subQueryExpl.IsMatch) |
| { |
| return subQueryExpl; |
| } |
| FunctionValues vals = outerInstance.boostVal.GetValues(fcontext, readerContext); |
| float sc = subQueryExpl.Value * vals.SingleVal(doc); |
| Explanation res = new ComplexExplanation(true, sc, outerInstance.ToString() + ", product of:"); |
| res.AddDetail(subQueryExpl); |
| res.AddDetail(vals.Explain(doc)); |
| return res; |
| } |
| } |
| |
| private sealed class CustomScorer : Scorer |
| { |
| private readonly BoostedQuery outerInstance; |
| |
| private readonly BoostedQuery.BoostedWeight weight; |
| private readonly float qWeight; |
| private readonly Scorer scorer; |
| private readonly FunctionValues vals; |
| private readonly AtomicReaderContext readerContext; |
| |
| public CustomScorer(BoostedQuery outerInstance, AtomicReaderContext readerContext, BoostedQuery.BoostedWeight w, float qWeight, Scorer scorer, ValueSource vs) |
| : base(w) |
| { |
| this.outerInstance = outerInstance; |
| this.weight = w; |
| this.qWeight = qWeight; |
| this.scorer = scorer; |
| this.readerContext = readerContext; |
| this.vals = vs.GetValues(weight.fcontext, readerContext); |
| } |
| |
| public override int DocID |
| { |
| get { return scorer.DocID; } |
| } |
| |
| public override int Advance(int target) |
| { |
| return scorer.Advance(target); |
| } |
| |
| public override int NextDoc() |
| { |
| return scorer.NextDoc(); |
| } |
| |
| public override float GetScore() |
| { |
| float score = qWeight * scorer.GetScore() * vals.SingleVal(scorer.DocID); |
| |
| // Current Lucene priority queues can't handle NaN and -Infinity, so |
| // map to -Float.MAX_VALUE. This conditional handles both -infinity |
| // and NaN since comparisons with NaN are always false. |
| return score > float.NegativeInfinity ? score : -float.MaxValue; |
| } |
| |
| public override int Freq |
| { |
| get { return scorer.Freq; } |
| } |
| |
| public override ICollection<ChildScorer> GetChildren() |
| { |
| return new List<ChildScorer> { new ChildScorer(scorer, "CUSTOM") }; |
| } |
| |
| public Explanation Explain(int doc) |
| { |
| var subQueryExpl = weight.qWeight.Explain(readerContext, doc); |
| if (!subQueryExpl.IsMatch) |
| { |
| return subQueryExpl; |
| } |
| float sc = subQueryExpl.Value * vals.SingleVal(doc); |
| Explanation res = new ComplexExplanation(true, sc, outerInstance.ToString() + ", product of:"); |
| res.AddDetail(subQueryExpl); |
| res.AddDetail(vals.Explain(doc)); |
| return res; |
| } |
| |
| public override long GetCost() |
| { |
| return scorer.GetCost(); |
| } |
| } |
| |
| |
| public override string ToString(string field) |
| { |
| var sb = new StringBuilder(); |
| sb.Append("boost(").Append(q.ToString(field)).Append(',').Append(boostVal).Append(')'); |
| sb.Append(ToStringUtils.Boost(Boost)); |
| return sb.ToString(); |
| } |
| |
| public override bool Equals(object o) |
| { |
| if (!base.Equals(o)) |
| { |
| return false; |
| } |
| var other = (BoostedQuery)o; |
| return this.q.Equals(other.q) && this.boostVal.Equals(other.boostVal); |
| } |
| |
| public override int GetHashCode() |
| { |
| int h = q.GetHashCode(); |
| h ^= (h << 17) | ((int)((uint)h >> 16)); |
| h += boostVal.GetHashCode(); |
| h ^= (h << 8) | ((int)((uint)h >> 25)); |
| h += J2N.BitConversion.SingleToInt32Bits(Boost); |
| return h; |
| } |
| } |
| } |