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LUCENE-8116: SimScorer now only takes a frequency and a norm as per-d…
…ocument scoring factors.
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74 changes: 74 additions & 0 deletions
74
lucene/core/src/java/org/apache/lucene/search/LeafSimScorer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| package org.apache.lucene.search; | ||
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| import java.io.IOException; | ||
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| import org.apache.lucene.index.LeafReader; | ||
| import org.apache.lucene.index.NumericDocValues; | ||
| import org.apache.lucene.search.similarities.Similarity.SimScorer; | ||
|
|
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| /** | ||
| * {@link SimScorer} on a specific {@link LeafReader}. | ||
| */ | ||
| public final class LeafSimScorer { | ||
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| private final SimScorer scorer; | ||
| private final NumericDocValues norms; | ||
| private final float maxScore; | ||
|
|
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| /** | ||
| * Sole constructor: Score documents of {@code reader} with {@code scorer}. | ||
| */ | ||
| public LeafSimScorer(SimScorer scorer, LeafReader reader, boolean needsScores, float maxFreq) throws IOException { | ||
| this.scorer = scorer; | ||
| norms = needsScores ? reader.getNormValues(scorer.getField()) : null; | ||
| maxScore = scorer.maxScore(maxFreq); | ||
| } | ||
|
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| private long getNormValue(int doc) throws IOException { | ||
| if (norms != null) { | ||
| boolean found = norms.advanceExact(doc); | ||
| assert found; | ||
| return norms.longValue(); | ||
| } else { | ||
| return 1L; // default norm | ||
| } | ||
| } | ||
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| /** Score the provided document assuming the given term document frequency. | ||
| * This method must be called on non-decreasing sequences of doc ids. | ||
| * @see SimScorer#score(float, long) */ | ||
| public float score(int doc, float freq) throws IOException { | ||
| return scorer.score(freq, getNormValue(doc)); | ||
| } | ||
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| /** Explain the score for the provided document assuming the given term document frequency. | ||
| * This method must be called on non-decreasing sequences of doc ids. | ||
| * @see SimScorer#explain(Explanation, long) */ | ||
| public Explanation explain(int doc, Explanation freqExpl) throws IOException { | ||
| return scorer.explain(freqExpl, getNormValue(doc)); | ||
| } | ||
|
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| /** | ||
| * Return an upper bound of the score. | ||
| * @see SimScorer#maxScore(float) | ||
| */ | ||
| public float maxScore() { | ||
| return maxScore; | ||
| } | ||
| } |
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