| /* |
| * 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 org.apache.lucene.search.BooleanClause; |
| import org.apache.lucene.search.BooleanQuery; |
| import org.apache.lucene.search.BoostQuery; |
| import org.apache.lucene.search.DisjunctionMaxQuery; |
| import org.apache.lucene.search.Query; |
| import org.apache.solr.common.params.SolrParams; |
| import org.apache.solr.request.SolrQueryRequest; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| |
| /** |
| * @see MaxScoreQParserPlugin |
| */ |
| public class MaxScoreQParser extends LuceneQParser { |
| float tie = 0.0f; |
| |
| public MaxScoreQParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) { |
| super(qstr, localParams, params, req); |
| if (getParam("tie") != null) { |
| tie = Float.parseFloat(getParam("tie")); |
| } |
| } |
| |
| /** |
| * Parses the query exactly like the Lucene parser does, but |
| * delegates all SHOULD clauses to DisjunctionMaxQuery with |
| * meaning only the clause with the max score will contribute |
| * to the overall score, unless the tie parameter is specified. |
| * <br> |
| * The max() is only calculated from the SHOULD clauses. |
| * Any MUST clauses will be passed through as separate |
| * BooleanClauses and thus always contribute to the score. |
| * @return the resulting Query |
| * @throws org.apache.solr.search.SyntaxError if parsing fails |
| */ |
| @Override |
| public Query parse() throws SyntaxError { |
| Query q = super.parse(); |
| float boost = 1f; |
| if (q instanceof BoostQuery) { |
| BoostQuery bq = (BoostQuery) q; |
| boost = bq.getBoost(); |
| q = bq.getQuery(); |
| } |
| if (q instanceof BooleanQuery == false) { |
| if (boost != 1f) { |
| q = new BoostQuery(q, boost); |
| } |
| return q; |
| } |
| BooleanQuery obq = (BooleanQuery)q; |
| Collection<Query> should = new ArrayList<>(); |
| Collection<BooleanClause> prohibOrReq = new ArrayList<>(); |
| BooleanQuery.Builder newqb = new BooleanQuery.Builder(); |
| |
| for (BooleanClause clause : obq) { |
| if(clause.isProhibited() || clause.isRequired()) { |
| prohibOrReq.add(clause); |
| } else { |
| BooleanQuery.Builder bq = new BooleanQuery.Builder(); |
| bq.add(clause); |
| should.add(bq.build()); |
| } |
| } |
| if (should.size() > 0) { |
| DisjunctionMaxQuery dmq = new DisjunctionMaxQuery(should, tie); |
| newqb.add(dmq, BooleanClause.Occur.SHOULD); |
| } |
| for(BooleanClause c : prohibOrReq) { |
| newqb.add(c); |
| } |
| Query newq = newqb.build(); |
| if (boost != 1f) { |
| newq = new BoostQuery(newq, boost); |
| } |
| return newq; |
| } |
| } |