/*
 * ============================================================================
 * GNU Lesser General Public License
 * ============================================================================
 *
 * Beanlet - JSE Application Container.
 * Copyright (C) 2006  Leon van Zantvoort
 * 
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 * 
 * Leon van Zantvoort
 * 243 Acalanes Drive #11
 * Sunnyvale, CA 94086
 * USA
 *
 * zantvoort@users.sourceforge.net
 * http://beanlet.org
 */
package org.beanlet.persistence.impl;

import java.io.Serializable;
import java.util.Comparator;
import org.jargo.deploy.SequentialDeployable;

/**
 *
 * @author Leon van Zantvoort
 */
public final class SequentialDeployableComparator<T extends SequentialDeployable> 
        implements Comparator<T>, Serializable {
    
    // PENDING: copied from beanlet-jersey.
    
    private static final long serialVersionUID = 8302042876307325570L;
    
    public int compare(T t1, T t2) {
        return getValue(t1.sequence(t2)) - getValue(t2.sequence(t1));
    }
    
    private int getValue(SequentialDeployable.Sequence seq) {
        switch (seq) {
            case BEFORE:
                return -1;
            case EQUAL:
                return 0;
            case AFTER:
                return 1;
            default:
                return 0;
        }
    }
}