| /* |
| * 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.queries.function.FunctionQuery; |
| import org.apache.lucene.queries.function.FunctionScoreQuery; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.queries.function.valuesource.QueryValueSource; |
| import org.apache.lucene.search.Query; |
| import org.apache.solr.common.params.SolrParams; |
| import org.apache.solr.common.util.NamedList; |
| import org.apache.solr.request.SolrQueryRequest; |
| |
| /** |
| * Create a boosted query from the input value. The main value is the query to be boosted. |
| * <br>Other parameters: <code>b</code>, the function query to use as the boost. |
| * <p>Example: <code>{!boost b=log(popularity)}foo</code> creates a query "foo" |
| * which is boosted (scores are multiplied) by the function query <code>log(popularity)</code>. |
| * The query to be boosted may be of any type. |
| * |
| * <p>Example: <code>{!boost b=recip(ms(NOW,mydatefield),3.16e-11,1,1)}foo</code> creates a query "foo" |
| * which is boosted by the date boosting function referenced in |
| * {@link org.apache.lucene.queries.function.valuesource.ReciprocalFloatFunction} |
| */ |
| public class BoostQParserPlugin extends QParserPlugin { |
| public static final String NAME = "boost"; |
| public static String BOOSTFUNC = "b"; |
| |
| @Override |
| public QParser createParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) { |
| return new QParser(qstr, localParams, params, req) { |
| QParser baseParser; |
| ValueSource vs; |
| String b; |
| |
| @Override |
| public Query parse() throws SyntaxError { |
| b = localParams.get(BOOSTFUNC); |
| baseParser = subQuery(localParams.get(QueryParsing.V), null); |
| Query q = baseParser.getQuery(); |
| |
| if (b == null) return q; |
| Query bq = subQuery(b, FunctionQParserPlugin.NAME).getQuery(); |
| if (bq instanceof FunctionQuery) { |
| vs = ((FunctionQuery)bq).getValueSource(); |
| } else { |
| vs = new QueryValueSource(bq, 0.0f); |
| } |
| return FunctionScoreQuery.boostByValue(q, vs.asDoubleValuesSource()); |
| } |
| |
| |
| @Override |
| public String[] getDefaultHighlightFields() { |
| return baseParser.getDefaultHighlightFields(); |
| } |
| |
| @Override |
| public Query getHighlightQuery() throws SyntaxError { |
| return baseParser.getHighlightQuery(); |
| } |
| |
| @Override |
| public void addDebugInfo(NamedList<Object> debugInfo) { |
| // encapsulate base debug info in a sub-list? |
| baseParser.addDebugInfo(debugInfo); |
| debugInfo.add("boost_str",b); |
| debugInfo.add("boost_parsed",vs); |
| } |
| }; |
| } |
| |
| } |