1 package org.apache.lucene.xmlparser.builders;
3 import org.apache.lucene.search.BoostingQuery;
4 import org.apache.lucene.search.Query;
5 import org.apache.lucene.xmlparser.DOMUtils;
6 import org.apache.lucene.xmlparser.ParserException;
7 import org.apache.lucene.xmlparser.QueryBuilder;
8 import org.w3c.dom.Element;
10 * Licensed to the Apache Software Foundation (ASF) under one or more
11 * contributor license agreements. See the NOTICE file distributed with
12 * this work for additional information regarding copyright ownership.
13 * The ASF licenses this file to You under the Apache License, Version 2.0
14 * (the "License"); you may not use this file except in compliance with
15 * the License. You may obtain a copy of the License at
17 * http://www.apache.org/licenses/LICENSE-2.0
19 * Unless required by applicable law or agreed to in writing, software
20 * distributed under the License is distributed on an "AS IS" BASIS,
21 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22 * See the License for the specific language governing permissions and
23 * limitations under the License.
29 public class BoostingQueryBuilder implements QueryBuilder
32 private QueryBuilder factory;
33 float defaultBoost=0.01f;
35 public BoostingQueryBuilder (QueryBuilder factory)
40 public Query getQuery(Element e) throws ParserException
43 Element mainQueryElem=DOMUtils.getChildByTagOrFail(e,"Query");
44 mainQueryElem=DOMUtils.getFirstChildOrFail(mainQueryElem);
45 Query mainQuery=factory.getQuery(mainQueryElem);
47 Element boostQueryElem=DOMUtils.getChildByTagOrFail(e,"BoostQuery");
48 float boost=DOMUtils.getAttribute(boostQueryElem,"boost",defaultBoost);
49 boostQueryElem=DOMUtils.getFirstChildOrFail(boostQueryElem);
50 Query boostQuery=factory.getQuery(boostQueryElem);
52 BoostingQuery bq = new BoostingQuery(mainQuery,boostQuery,boost);
54 bq.setBoost(DOMUtils.getAttribute(e,"boost",1.0f));