| /* |
| * 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.search; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.search.MatchAllDocsQuery; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.search.QueryRescorer; |
| import org.apache.solr.common.SolrException; |
| import org.apache.solr.common.params.SolrParams; |
| import org.apache.solr.request.SolrQueryRequest; |
| |
| import org.apache.commons.lang3.StringUtils; |
| |
| /* |
| * |
| * Syntax: q=*:*&rq={!rerank reRankQuery=$rqq reRankDocs=300 reRankWeight=3} |
| * |
| */ |
| |
| public class ReRankQParserPlugin extends QParserPlugin { |
| |
| public static final String NAME = "rerank"; |
| private static Query defaultQuery = new MatchAllDocsQuery(); |
| |
| public static final String RERANK_QUERY = "reRankQuery"; |
| |
| public static final String RERANK_DOCS = "reRankDocs"; |
| public static final int RERANK_DOCS_DEFAULT = 200; |
| |
| public static final String RERANK_WEIGHT = "reRankWeight"; |
| public static final double RERANK_WEIGHT_DEFAULT = 2.0d; |
| |
| public QParser createParser(String query, SolrParams localParams, SolrParams params, SolrQueryRequest req) { |
| return new ReRankQParser(query, localParams, params, req); |
| } |
| |
| private class ReRankQParser extends QParser { |
| |
| public ReRankQParser(String query, SolrParams localParams, SolrParams params, SolrQueryRequest req) { |
| super(query, localParams, params, req); |
| } |
| |
| public Query parse() throws SyntaxError { |
| String reRankQueryString = localParams.get(RERANK_QUERY); |
| if (StringUtils.isBlank(reRankQueryString)) { |
| throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, RERANK_QUERY+" parameter is mandatory"); |
| } |
| QParser reRankParser = QParser.getParser(reRankQueryString, req); |
| Query reRankQuery = reRankParser.parse(); |
| |
| int reRankDocs = localParams.getInt(RERANK_DOCS, RERANK_DOCS_DEFAULT); |
| reRankDocs = Math.max(1, reRankDocs); // |
| |
| double reRankWeight = localParams.getDouble(RERANK_WEIGHT, RERANK_WEIGHT_DEFAULT); |
| |
| return new ReRankQuery(reRankQuery, reRankDocs, reRankWeight); |
| } |
| } |
| |
| private static final class ReRankQueryRescorer extends QueryRescorer { |
| |
| final double reRankWeight; |
| |
| public ReRankQueryRescorer(Query reRankQuery, double reRankWeight) { |
| super(reRankQuery); |
| this.reRankWeight = reRankWeight; |
| } |
| |
| @Override |
| protected float combine(float firstPassScore, boolean secondPassMatches, float secondPassScore) { |
| float score = firstPassScore; |
| if (secondPassMatches) { |
| score += reRankWeight * secondPassScore; |
| } |
| return score; |
| } |
| } |
| |
| private final class ReRankQuery extends AbstractReRankQuery { |
| final private Query reRankQuery; |
| final private double reRankWeight; |
| |
| public int hashCode() { |
| return 31 * classHash() + mainQuery.hashCode()+reRankQuery.hashCode()+(int)reRankWeight+reRankDocs; |
| } |
| |
| public boolean equals(Object other) { |
| return sameClassAs(other) && |
| equalsTo(getClass().cast(other)); |
| } |
| |
| private boolean equalsTo(ReRankQuery rrq) { |
| return mainQuery.equals(rrq.mainQuery) && |
| reRankQuery.equals(rrq.reRankQuery) && |
| reRankWeight == rrq.reRankWeight && |
| reRankDocs == rrq.reRankDocs; |
| } |
| |
| public ReRankQuery(Query reRankQuery, int reRankDocs, double reRankWeight) { |
| super(defaultQuery, reRankDocs, new ReRankQueryRescorer(reRankQuery, reRankWeight)); |
| this.reRankQuery = reRankQuery; |
| this.reRankWeight = reRankWeight; |
| } |
| |
| @Override |
| public String toString(String s) { |
| final StringBuilder sb = new StringBuilder(100); // default initialCapacity of 16 won't be enough |
| sb.append("{!").append(NAME); |
| sb.append(" mainQuery='").append(mainQuery.toString()).append("' "); |
| sb.append(RERANK_QUERY).append("='").append(reRankQuery.toString()).append("' "); |
| sb.append(RERANK_DOCS).append('=').append(reRankDocs).append(' '); |
| sb.append(RERANK_WEIGHT).append('=').append(reRankWeight).append('}'); |
| return sb.toString(); |
| } |
| |
| protected Query rewrite(Query rewrittenMainQuery) throws IOException { |
| return new ReRankQuery(reRankQuery, reRankDocs, reRankWeight).wrap(rewrittenMainQuery); |
| } |
| } |
| } |