package com.oreilly.jent.people;

/**
 * In general, you may use the code in this book in your programs and 
 * documentation. You do not need to contact us for permission unless 
 * you're reproducing a significant portion of the code. For example, 
 * writing a program that uses several chunks of code from this book does 
 * not require permission. Selling or distributing a CD-ROM of examples 
 * from O'Reilly books does require permission. Answering a question by 
 * citing this book and quoting example code does not require permission. 
 * Incorporating a significant amount of example code from this book into 
 * your product's documentation does require permission.
 * 
 * We appreciate, but do not require, attribution. An attribution usually 
 * includes the title, author, publisher, and ISBN. For example: 
 * 
 *   "Java Enterprise in a Nutshell, Third Edition, 
 *    by Jim Farley and William Crawford 
 *    with Prakash Malani, John G. Norman, and Justin Gehtland. 
 *    Copyright 2006 O'Reilly Media, Inc., 0-596-10142-2."
 *  
 *  If you feel your use of code examples falls outside fair use or the 
 *  permission given above, feel free to contact us at 
 *  permissions@oreilly.com.
 */

import java.util.Comparator;

/**
 * A comparator that allows a collection of Person beans to be sorted
 * according to last name, first name.
 * 
 * @author Jim Farley
 */
public class PersonSorter implements Comparator {
    public PersonSorter() {}
    public int compare(Object o1, Object o2) {
        Person p1 = (Person)o1;
        Person p2 = (Person)o2;
        int ncomp = p1.getLastName().compareTo(p2.getLastName());
        // If the last names are equal, check the first names
        if (ncomp == 0) {
            ncomp = p1.getFirstName().compareTo(p2.getFirstName());
        }
        return ncomp;
    }
}