OrderLineComparator.java

/*
 jBilling - The Enterprise Open Source Billing System
 Copyright (C) 2003-2011 Enterprise jBilling Software Ltd. and Emiliano Conde

 This file is part of jbilling.

 jbilling is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 jbilling 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 Affero General Public License for more details.

 You should have received a copy of the GNU Affero General Public License
 along with jbilling.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Created on Nov 18, 2004
 *
 */
package com.sapienter.jbilling.server.order;

import java.io.Serializable;
import java.util.Comparator;

import com.sapienter.jbilling.server.order.db.OrderLineDTO;

/**
 * @author Emil
 *
 */
public class OrderLineComparator implements Comparator<OrderLineDTO>, Serializable {

    /* (non-Javadoc)
     * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
     */
    public int compare(OrderLineDTO o1, OrderLineDTO o2) {
        int retValue = 0;
        OrderLineDTO perA = (OrderLineDTO) o1;
        OrderLineDTO perB = (OrderLineDTO) o2;
        
        if (perA != null && perA.getItem() != null && 
                perA.getItem().getNumber() != null &&
                perB != null && perB.getItem() != null && 
                    perB.getItem().getNumber() != null) {
            retValue = perA.getItem().getNumber().compareTo(
                    perB.getItem().getNumber());
        } else if (perA != null && perA.getItem() != null && 
                    perA.getItem().getNumber() != null) {
                retValue = -1;
        } else if (perB != null && perB.getItem() != null && 
                perB.getItem().getNumber() != null) {
            retValue = 1;
        }
        
        return retValue;
    }

}