/*
* 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.lucene.queryparser.xml.builders;
import org.apache.lucene.queryparser.xml.DOMUtils;
import org.apache.lucene.queryparser.xml.ParserException;
import org.apache.lucene.queryparser.xml.QueryBuilder;
import org.apache.lucene.queryparser.xml.QueryBuilderFactory;
import org.apache.lucene.search.BoostQuery;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.Query;
import org.w3c.dom.Element;
/**
* Builder for {@link ConstantScoreQuery}
*/
public class ConstantScoreQueryBuilder implements QueryBuilder {
private final QueryBuilderFactory queryFactory;
public ConstantScoreQueryBuilder(QueryBuilderFactory queryFactory) {
this.queryFactory = queryFactory;
}
@Override
public Query getQuery(Element e) throws ParserException {
Element queryElem = DOMUtils.getFirstChildOrFail(e);
Query q = new ConstantScoreQuery(queryFactory.getQuery(queryElem));
float boost = DOMUtils.getAttribute(e, "boost", 1.0f);
if (boost != 1f) {
q = new BoostQuery(q, boost);
}
return q;
}
}