/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o 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, see http://www.gnu.org/licenses/. */
package com.db4o.query;
import java.io.*;
/**
* Comparator for sorting queries on JDKs where
* java.util.Comparator is not available.
*/
public interface QueryComparator<Target> extends Serializable {
/**
* Implement to compare two arguments for sorting.
* Return a negative value, zero, or a positive value if
* the first argument is smaller, equal or greater than
* the second.
*/
int compare(Target first, Target second);
}