/**
* Copyright 2014 National University of Ireland, Galway.
*
* This file is part of the SIREn project. Project and contact information:
*
* https://github.com/rdelbru/SIREn
*
* Licensed 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.sindice.siren.qparser.json.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.QueryNode;
import org.apache.lucene.search.Query;
import org.sindice.siren.qparser.json.nodes.BooleanQueryNode;
import org.sindice.siren.qparser.json.nodes.TopLevelQueryNode;
import org.sindice.siren.search.node.LuceneProxyNodeQuery;
import org.sindice.siren.search.node.NodeQuery;
/**
* Check if the child in the {@link TopLevelQueryNode} object is a
* {@link BooleanQuery} or a {@link NodeQuery}, and wraps a {@link NodeQuery}
* object into a {@link LuceneProxyNodeQuery}.
* <p>
* The child in the {@link TopLevelQueryNode} object must be tagged
* using {@link QueryTreeBuilder#QUERY_TREE_BUILDER_TAGID} with a
* {@link Query} object.
*/
public class TopLevelQueryNodeBuilder implements JsonQueryBuilder {
public TopLevelQueryNodeBuilder() {}
@Override
public Query build(final QueryNode queryNode) throws QueryNodeException {
final TopLevelQueryNode topNode = (TopLevelQueryNode) queryNode;
final QueryNode child = topNode.getChildren().get(0);
final Object obj = child.getTag(QueryTreeBuilder.QUERY_TREE_BUILDER_TAGID);
if (child instanceof BooleanQueryNode) {
// no need to wrap the query object into a lucene proxy query
return (Query) obj;
}
else {
return new LuceneProxyNodeQuery((NodeQuery) obj);
}
}
}