package push;import java.util.Vector;import java.util.Calendar;import java.text.SimpleDateFormat;/** * Birthday checker class.  * * @version 1.0 * @since 1.0 * @see Runnable */public final class Birthday implements Runnable {    private final PushInitiator pusher;    private final String url;    private static final String messageContent =  	"We hear you're having a birthday soon! We would like to invite you to celebrate it in our zoo. " +	"A refreshment is  on the house at the Safari restaurant.";    private final String addressType;    /**     * Creates a new <code>Birthday</code> instance.     *     * @param pusher a <code>PushInitiator</code> value     * @param url a <code>String</code> value     * @param addressType a <code>String</code> value     */    public Birthday(PushInitiator pusher, String url, String addressType) {	this.pusher = pusher;	this.url = url;	this.addressType = addressType;    }    /**     *  A birthday checker thread sends push messages to users about approaching birthday. The message     *  is sent 1 to 14 days before the birthday.      */    public void run() {	String message = PushInitiator.createSiMessage(url,  null, null, null, 						       null, messageContent);	while(true) {	    try {		Vector users = User.getUsersOnline();		for(int i=0; i<users.size(); i++) {		    User user = (User)users.get(i);		    String name = user.getName();		    String dob = user.getDob();		    Object notified = user.getProperty("birthdayNotified");		    int days = numberOfDaysToBirthday(dob);		    if(notified == null && days >= 1 && days <= 14) {			String address = user.getAddress(addressType);			if(address != null && !address.trim().equals("")) {			  			    try {				pusher.sendPushMessage(address, addressType, message, PushService.SI_CONTENT_TYPE);			    } catch(Exception ee) {}			    user.setProperty("birthdayNotified", new Long(System.currentTimeMillis()));			}		    }		}			    }	    catch(Exception e) { System.err.println(e); }	    try {		Thread.sleep(60000); // 1 min	    }	    catch(InterruptedException e){}	}    }    /**     * Calculates the number of days to birthday on the basis of date of birth     * given in format "yyyy.mm.dd"     *     * @param dob a <code>String</code> value     * @return an <code>int</code> value     */    private static int numberOfDaysToBirthday(String dob) {        SimpleDateFormat s = new SimpleDateFormat("yyyy.MM.dd");        final long numberOfMillisecondsPerDay = 1000*60*60*24;        try {            java.util.Date d = s.parse(dob);            Calendar c1 = Calendar.getInstance();            c1.setTime(d);            Calendar c2 = Calendar.getInstance();            c1.set(Calendar.YEAR, c2.get(Calendar.YEAR));            int d1 = c1.get(Calendar.DAY_OF_YEAR);            int d2 = c2.get(Calendar.DAY_OF_YEAR); // current day	    if(d2 > d1)  { // birthday next year                c1.roll(Calendar.YEAR, true); // set next birthday                d1 = c1.get(Calendar.DAY_OF_YEAR);            }            return (int)((c1.getTime().getTime() - c2.getTime().getTime())/numberOfMillisecondsPerDay);        }        catch(Exception e) { System.err.println(e); }        return -1;    }}