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Lucene example source code file (ReqOptSumScorer.java)
The Lucene ReqOptSumScorer.java source codepackage org.apache.lucene.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. */ import java.io.IOException; /** A Scorer for queries with a required part and an optional part. * Delays skipTo() on the optional part until a score() is needed. * <br> * This <code>Scorer implements {@link Scorer#skipTo(int)}. */ class ReqOptSumScorer extends Scorer { /** The scorers passed from the constructor. * These are set to null as soon as their next() or skipTo() returns false. */ private Scorer reqScorer; private Scorer optScorer; /** Construct a <code>ReqOptScorer. * @param reqScorer The required scorer. This must match. * @param optScorer The optional scorer. This is used for scoring only. */ public ReqOptSumScorer( Scorer reqScorer, Scorer optScorer) { super(reqScorer.weight); this.reqScorer = reqScorer; this.optScorer = optScorer; } @Override public int nextDoc() throws IOException { return reqScorer.nextDoc(); } @Override public int advance(int target) throws IOException { return reqScorer.advance(target); } @Override public int docID() { return reqScorer.docID(); } /** Returns the score of the current document matching the query. * Initially invalid, until {@link #nextDoc()} is called the first time. * @return The score of the required scorer, eventually increased by the score * of the optional scorer when it also matches the current document. */ @Override public float score() throws IOException { int curDoc = reqScorer.docID(); float reqScore = reqScorer.score(); 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.score() : reqScore; } } Other Lucene examples (source code examples)Here is a short list of links related to this Lucene ReqOptSumScorer.java source code file: |
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