/*******************************************************************************
* Copyright 2014 University of Southern California
*
* 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.
*
* This code was developed by the Information Integration Group as part
* of the Karma project at the Information Sciences Institute of the
* University of Southern California. For more information, publications,
* and related projects, please see: http://www.isi.edu/integration
******************************************************************************/
package edu.isi.karma.kr2rml.planning;
public class RootStrategy {
protected RootStrategy backupStrategy;
public RootStrategy()
{
}
public RootStrategy(RootStrategy backupStrategy)
{
this.backupStrategy = backupStrategy;
}
public String findRoot(TriplesMapGraph graph){
if(graph.getTriplesMapIds().isEmpty())
{
return null;
}
else
{
return graph.getTriplesMapIds().iterator().next();
}
}
}