package org.apache.lucene.xmlparser.builders;
import org.apache.lucene.search.BoostingQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.xmlparser.DOMUtils;
import org.apache.lucene.xmlparser.ParserException;
import org.apache.lucene.xmlparser.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.
*/
/**
*
*/
public class BoostingQueryBuilder implements QueryBuilder
{
private QueryBuilder factory;
float defaultBoost=0.01f;
public BoostingQueryBuilder (QueryBuilder factory)
{
this.factory=factory;
}
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",defaultBoost);
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;
}
}