| /* |
| * 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.solr.ltr.feature; |
| |
| import java.io.IOException; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.index.Term; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.search.ScoreMode; |
| import org.apache.lucene.search.Scorer; |
| import org.apache.lucene.search.Weight; |
| import org.apache.solr.ltr.DocInfo; |
| import org.apache.solr.request.SolrQueryRequest; |
| /** |
| * This feature returns the original score that the document had before performing |
| * the reranking. |
| * Example configuration: |
| * <pre>{ |
| "name": "originalScore", |
| "class": "org.apache.solr.ltr.feature.OriginalScoreFeature", |
| "params": { } |
| }</pre> |
| **/ |
| public class OriginalScoreFeature extends Feature { |
| |
| public OriginalScoreFeature(String name, Map<String,Object> params) { |
| super(name, params); |
| } |
| |
| @Override |
| public LinkedHashMap<String,Object> paramsToMap() { |
| return defaultParamsToMap(); |
| } |
| |
| @Override |
| protected void validate() throws FeatureException { |
| } |
| |
| @Override |
| public OriginalScoreWeight createWeight(IndexSearcher searcher, |
| boolean needsScores, SolrQueryRequest request, Query originalQuery, Map<String,String[]> efi) throws IOException { |
| return new OriginalScoreWeight(searcher, request, originalQuery, efi); |
| |
| } |
| |
| public class OriginalScoreWeight extends FeatureWeight { |
| |
| final Weight w; |
| |
| public OriginalScoreWeight(IndexSearcher searcher, |
| SolrQueryRequest request, Query originalQuery, Map<String,String[]> efi) throws IOException { |
| super(OriginalScoreFeature.this, searcher, request, originalQuery, efi); |
| w = searcher.createWeight(searcher.rewrite(originalQuery), ScoreMode.COMPLETE, 1); |
| }; |
| |
| |
| @Override |
| public String toString() { |
| return "OriginalScoreFeature [query:" + originalQuery.toString() + "]"; |
| } |
| |
| @Override |
| public void extractTerms(Set<Term> terms) { |
| w.extractTerms(terms); |
| } |
| |
| @Override |
| public FeatureScorer scorer(LeafReaderContext context) throws IOException { |
| |
| final Scorer originalScorer = w.scorer(context); |
| return new OriginalScoreScorer(this, originalScorer); |
| } |
| |
| public class OriginalScoreScorer extends FilterFeatureScorer { |
| |
| public OriginalScoreScorer(FeatureWeight weight, Scorer originalScorer) { |
| super(weight, originalScorer); |
| } |
| |
| @Override |
| public float score() throws IOException { |
| // This is done to improve the speed of feature extraction. Since this |
| // was already scored in step 1 |
| // we shouldn't need to calc original score again. |
| final DocInfo docInfo = getDocInfo(); |
| return (docInfo != null && docInfo.hasOriginalDocScore() ? docInfo.getOriginalDocScore() : in.score()); |
| } |
| |
| } |
| |
| } |
| |
| } |