/*
* 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.flexible.standard.builders;
import org.apache.lucene.queryparser.flexible.core.QueryNodeException;
import org.apache.lucene.queryparser.flexible.core.builders.QueryTreeBuilder;
import org.apache.lucene.queryparser.flexible.core.nodes.BoostQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
import org.apache.lucene.search.BoostQuery;
import org.apache.lucene.search.Query;
/**
* This builder basically reads the {@link Query} object set on the
* {@link BoostQueryNode} child using
* {@link QueryTreeBuilder#QUERY_TREE_BUILDER_TAGID} and applies the boost value
* defined in the {@link BoostQueryNode}.
*/
public class BoostQueryNodeBuilder implements StandardQueryBuilder {
public BoostQueryNodeBuilder() {
// empty constructor
}
@Override
public Query build(QueryNode queryNode) throws QueryNodeException {
BoostQueryNode boostNode = (BoostQueryNode) queryNode;
QueryNode child = boostNode.getChild();
if (child == null) {
return null;
}
Query query = (Query) child
.getTag(QueryTreeBuilder.QUERY_TREE_BUILDER_TAGID);
return new BoostQuery(query, boostNode.getValue());
}
}