package org.apache.lucene.queryparser.xml.builders;
import org.apache.lucene.queries.BoostingQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.queryparser.xml.DOMUtils;
import org.apache.lucene.queryparser.xml.ParserException;
import org.apache.lucene.queryparser.xml.QueryBuilder;
import org.w3c.dom.Element;
/*
* 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.
*/
/**
* Builder for {@link BoostingQuery}
*/
public class BoostingQueryBuilder implements QueryBuilder {
private static float DEFAULT_BOOST = 0.01f;
private final QueryBuilder factory;
public BoostingQueryBuilder(QueryBuilder factory) {
this.factory = factory;
}
@Override
public Query getQuery(Element e) throws ParserException {
Element mainQueryElem = DOMUtils.getChildByTagOrFail(e, "Query");
mainQueryElem = DOMUtils.getFirstChildOrFail(mainQueryElem);
Query mainQuery = factory.getQuery(mainQueryElem);
Element boostQueryElem = DOMUtils.getChildByTagOrFail(e, "BoostQuery");
float boost = DOMUtils.getAttribute(boostQueryElem, "boost", DEFAULT_BOOST);
boostQueryElem = DOMUtils.getFirstChildOrFail(boostQueryElem);
Query boostQuery = factory.getQuery(boostQueryElem);
BoostingQuery bq = new BoostingQuery(mainQuery, boostQuery, boost);
bq.setBoost(DOMUtils.getAttribute(e, "boost", 1.0f));
return bq;
}
}