| /* |
| * 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; |
| |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.ImpactsEnum; |
| import org.apache.lucene.index.PostingsEnum; |
| import org.apache.lucene.index.SlowImpactsEnum; |
| |
| /** Expert: A <code>Scorer</code> for documents matching a <code>Term</code>. |
| */ |
| final class TermScorer extends Scorer { |
| private final PostingsEnum postingsEnum; |
| private final ImpactsEnum impactsEnum; |
| private final DocIdSetIterator iterator; |
| private final LeafSimScorer docScorer; |
| private final ImpactsDISI impactsDisi; |
| |
| /** |
| * Construct a {@link TermScorer} that will iterate all documents. |
| */ |
| TermScorer(Weight weight, PostingsEnum postingsEnum, LeafSimScorer docScorer) { |
| super(weight); |
| iterator = this.postingsEnum = postingsEnum; |
| impactsEnum = new SlowImpactsEnum(postingsEnum); |
| impactsDisi = new ImpactsDISI(impactsEnum, impactsEnum, docScorer.getSimScorer()); |
| this.docScorer = docScorer; |
| } |
| |
| /** |
| * Construct a {@link TermScorer} that will use impacts to skip blocks of |
| * non-competitive documents. |
| */ |
| TermScorer(Weight weight, ImpactsEnum impactsEnum, LeafSimScorer docScorer) { |
| super(weight); |
| postingsEnum = this.impactsEnum = impactsEnum; |
| impactsDisi = new ImpactsDISI(impactsEnum, impactsEnum, docScorer.getSimScorer()); |
| iterator = impactsDisi; |
| this.docScorer = docScorer; |
| } |
| |
| @Override |
| public int docID() { |
| return postingsEnum.docID(); |
| } |
| |
| final int freq() throws IOException { |
| return postingsEnum.freq(); |
| } |
| |
| @Override |
| public DocIdSetIterator iterator() { |
| return iterator; |
| } |
| |
| @Override |
| public float score() throws IOException { |
| assert docID() != DocIdSetIterator.NO_MORE_DOCS; |
| return docScorer.score(postingsEnum.docID(), postingsEnum.freq()); |
| } |
| |
| @Override |
| public float smoothingScore(int docId) throws IOException { |
| return docScorer.score(docId, 0); |
| } |
| |
| @Override |
| public int advanceShallow(int target) throws IOException { |
| return impactsDisi.advanceShallow(target); |
| } |
| |
| @Override |
| public float getMaxScore(int upTo) throws IOException { |
| return impactsDisi.getMaxScore(upTo); |
| } |
| |
| @Override |
| public void setMinCompetitiveScore(float minScore) { |
| impactsDisi.setMinCompetitiveScore(minScore); |
| } |
| |
| /** Returns a string representation of this <code>TermScorer</code>. */ |
| @Override |
| public String toString() { return "scorer(" + weight + ")[" + super.toString() + "]"; } |
| |
| } |