/*
* 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.exoplatform.services.jcr.impl.core.query.lucene;
import java.io.IOException;
import org.apache.lucene.search.Query; //NOSONAR
import org.apache.lucene.search.Sort;
import org.exoplatform.services.jcr.datamodel.InternalQName;
import org.exoplatform.services.jcr.impl.core.SessionImpl;
/**
* <code>JackrabbitQuery</code> defines an interface for Jackrabbit query
* implementations that are at the root of the lucene query tree. It gives the
* implementation the opportunity to execute in an optimized way returning
* {@link QueryHits} instead of a result that is tied to Lucene.
*/
public interface JcrQuery {
/**
* Executes this query and returns {@link QueryHits} or <code>null</code> if
* this query should be executed using the regular Lucene API.
* <br>
* <b>Important note:</b> an implementation <b>must not</b> call
* {@link JcrIndexSearcher#execute(Query, Sort, long, InternalQName)}
* with this query instance as a parameter, otherwise a stack overflow will
* occur.
*
* @param searcher the jackrabbit index searcher.
* @param session the session that executes the query.
* @param sort the sort criteria that must be reflected in the returned
* {@link QueryHits}.
* @return the query hits or <code>null</code> if the regular Lucene API
* should be used by the caller.
* @throws IOException if an error occurs while executing the query.
*/
public QueryHits execute(JcrIndexSearcher searcher,
SessionImpl session,
Sort sort)
throws IOException;
}