/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on June 26, 2015
*/
package com.bigdata.rdf.sparql.ast.eval;
import java.util.HashSet;
import java.util.Set;
import com.bigdata.bop.IVariable;
import com.bigdata.rdf.sparql.ast.service.CustomServiceFactory;
import com.bigdata.rdf.sparql.ast.service.ServiceFactory;
import com.bigdata.rdf.sparql.ast.service.ServiceNode;
/**
* Base class for abstract services, providing base implementation for
* getRequiredBound and getDesiredBound methods (which can be overridden
* by subclasses).
*
* @author <a href="mailto:ms@metaphacts.com">Michael Schmidt</a>
* @version $Id$
*/
public abstract class CustomServiceFactoryBase implements CustomServiceFactory {
/**
* Default implementation for method
* {@link ServiceFactory#getRequiredBound(ServiceNode)}, allowing for
* simple services where all variables used inside the service are
* considered "outgoing". As a consequence, when building upon this
* default implementation, the Service will be executed *before* the
* variables used inside the Service body are bound.
*/
@Override
public Set<IVariable<?>> getRequiredBound(final ServiceNode serviceNode) {
return new HashSet<IVariable<?>>();
}
/**
* Default implementation for method
* {@link ServiceFactory#getDesiredBound(ServiceNode)}, allowing for
* simple services where all variables used inside the service are
* considered "outgoing". As a consequence, when building upon this
* default implementation, the Service will be executed *before* the
* variables used inside the Service body are bound.
*/
@Override
public Set<IVariable<?>> getDesiredBound(final ServiceNode serviceNode) {
return new HashSet<IVariable<?>>();
}
}