/* 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;
import java.util.Comparator;
/**
* Compares Bibtex entries based on their 'crossref' fields. Entries including
* this field are deemed smaller than entries without this field. This serves
* the purpose of always placing referenced entries after referring entries in
* the .bib file. After this criterion comes comparisons of individual fields.
*/
public class CrossRefEntryComparator implements Comparator<BibtexEntry> {
private String crossRefField = "crossref";
public int compare(BibtexEntry e1, BibtexEntry e2)
throws ClassCastException {
Object f1 = e1.getField(crossRefField), f2 = e2.getField(crossRefField);
if ((f1 == null) && (f2 == null))
return 0; // secComparator.compare(e1, e2);
if ((f1 != null) && (f2 != null))
return 0; // secComparator.compare(e1, e2);
if (f1 != null)
return -1;
else
return 1;
}
}