/**
* This file is part of Archiv-Editor.
*
* The software Archiv-Editor serves as a client user interface for working with
* the Person Data Repository. See: pdr.bbaw.de
*
* The software Archiv-Editor was developed at the Berlin-Brandenburg Academy
* of Sciences and Humanities, Jägerstr. 22/23, D-10117 Berlin.
* www.bbaw.de
*
* Copyright (C) 2010-2013 Berlin-Brandenburg Academy
* of Sciences and Humanities
*
* The software Archiv-Editor was developed by @author: Christoph Plutte.
*
* Archiv-Editor is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Archiv-Editor 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Archiv-Editor.
* If not, see <http://www.gnu.org/licenses/lgpl-3.0.html>.
*/
package org.bbaw.pdr.ae.control.comparator;
import java.util.Comparator;
import java.util.Date;
import org.bbaw.pdr.ae.model.Aspect;
/**
* comparator for aspects according to last change date.
* @author Christoph Plutte
*/
public class AspectsByRecentChangesComparator implements Comparator<Aspect>
{
/** ascending flag. */
private boolean _ascending;
/**
* constructor with ascending flag.
* @param ascending ascending flag.
*/
public AspectsByRecentChangesComparator(final boolean ascending)
{
this._ascending = ascending;
}
@Override
public final int compare(final Aspect a1, final Aspect a2)
{
int diff = 0;
Date d1 = null;
Date d2 = null;
if (a1.getRecord() != null && a1.getRecord().getRevisions() != null && !a1.getRecord().getRevisions().isEmpty()
&& a1.getRecord().getRevisions().lastElement().getTimeStamp() != null)
{
d1 = a1.getRecord().getRevisions().lastElement().getTimeStamp();
}
if (a2.getRecord() != null && a2.getRecord().getRevisions() != null && !a2.getRecord().getRevisions().isEmpty()
&& a2.getRecord().getRevisions().lastElement().getTimeStamp() != null)
{
d2 = a2.getRecord().getRevisions().lastElement().getTimeStamp();
}
if (d1 != null && d2 != null)
{
diff = d1.compareTo(d2);
}
else if (d1 != null)
{
diff = -1;
}
else if (d2 != null)
{
diff = 1;
}
else
{
diff = 0;
}
if (_ascending)
{
return -diff;
}
else
{
return diff;
}
}
}