/* Copyright (C) 2003-2011 JabRef contributors.
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; either version 2 of the License, or
(at your option) any later version.
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package net.sf.jabref.oo;
import net.sf.jabref.BibtexEntry;
import net.sf.jabref.FieldComparator;
import java.util.Comparator;
/**
* Comparator for sorting bibliography entries according to publication year. This is used to
* sort entries in multiple citations where the oldest publication should appear first.
*/
public class YearComparator implements Comparator<BibtexEntry> {
FieldComparator authComp = new FieldComparator("author"),
editorComp = new FieldComparator("editor"),
yearComp = new FieldComparator("year");
public YearComparator() {
}
public int compare(BibtexEntry o1, BibtexEntry o2) {
// Year as first criterion:
int comp = yearComp.compare(o1, o2);
if (comp != 0)
return comp;
// TODO: Is it a good idea to try editor if author fields are equal?
// Author as next criterion:
comp = authComp.compare(o1, o2);
if (comp != 0)
return comp;
// Editor as next criterion:
return editorComp.compare(o1, o2);
}
}