/*
* 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.jackrabbit.mongomk.query;
import org.apache.jackrabbit.mongomk.MongoConnection;
import org.apache.jackrabbit.mongomk.model.HeadMongo;
/**
* An query for fetching the head revision.
*
* @author <a href="mailto:pmarx@adobe.com>Philipp Marx</a>
*/
public class FetchHeadRevisionQuery extends AbstractQuery<Long> {
/**
* Constructs a new {@code FetchHeadRevisionQuery}.
*
* @param mongoConnection
* The {@link MongoConnection}.
*/
public FetchHeadRevisionQuery(MongoConnection mongoConnection) {
super(mongoConnection);
}
@Override
public Long execute() throws Exception {
HeadMongo headMongo = fetchHead();
long headRevision = headMongo.getHeadRevisionId();
return headRevision;
}
private HeadMongo fetchHead() throws Exception {
return new FetchHeadQuery(mongoConnection).execute();
}
}