/*
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 Jul 6, 2008
*/
package com.bigdata.sparse;
import org.apache.log4j.Logger;
/**
* {@link IPrecondition} succeeds iff there are no property values for the
* logical row (it recognizes a <code>null</code>, indicating no property
* values, and an empty logical row, indicating that an {@link INameFilter} was
* applied and that there were no property values which satisified that filter,
* and a deleted property value for the primary key, which is often used as a
* shorthand for deleting the logical row).
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class EmptyRowPrecondition implements IPrecondition {
protected static final transient Logger log = Logger.getLogger(EmptyRowPrecondition.class);
/**
*
*/
private static final long serialVersionUID = -1397012918552028222L;
public boolean accept(ITPS logicalRow) {
if (logicalRow == null) {
if(log.isInfoEnabled()) {
log.info("No property values for row: (null)");
}
return true;
}
if(logicalRow.size() == 0) {
if(log.isInfoEnabled()) {
log.info("Logical row size is zero: "+logicalRow);
}
return true;
}
if(logicalRow.getPrimaryKey() == null) {
if(log.isInfoEnabled()) {
log.info("Primary key row is deleted: "+logicalRow);
}
return true;
}
return false;
}
}