import java.io.*; 
import java.text.*; 
import java.util.*; 
import javax.swing.*; 
 
/** 
 * Read a file of reminders, sleep until each is due, beep. 
 */ 
public class ReminderService { 
    class Item { 
        Date due; 
        String message; 
        Item(Date d, String m) { 
            due = d; 
            message = m; 
        } 
    } 
 
    ArrayList l = new ArrayList(  ); 
 
    public static void main(String argv[]) throws IOException { 
        ReminderService rs = new ReminderService(  ); 
        rs.load(  ); 
        rs.run(  ); 
    } 
 
    protected void load(  ) throws IOException { 
 
        BufferedReader is = new BufferedReader( 
            new FileReader("ReminderService.txt")); 
        SimpleDateFormat formatter = 
            new SimpleDateFormat ("yyyy MM dd hh mm"); 
        String aLine; 
        while ((aLine = is.readLine(  )) != null) { 
            ParsePosition pp = new ParsePosition(0); 
            Date date = formatter.parse(aLine, pp); 
            if (date == null) { 
                message("Invalid date in " + aLine); 
                continue; 
            } 
            String mesg = aLine.substring(pp.getIndex(  )); 
            l.add(new Item(date, mesg)); 
        } 
    } 
 
    public void run(  ) { 
        System.out.println("ReminderService: Starting at " + new Date(  )); 
        while (!l.isEmpty(  )) { 
            Date d = new Date(  ); 
            Item i = (Item)l.get(0); 
            long interval = i.due.getTime() - d.getTime(  ); 
            if (interval > 0) { 
                System.out.println("Sleeping until " + i.due); 
                try { 
                    Thread.sleep(interval); 
                } catch (InterruptedException e) { 
                    System.exit(1);    // unexpected intr 
                } 
                message(i.due + ": " + i.message); 
            } else 
                message("MISSED " + i.message + " at " + i.due); 
            l.remove(0); 
        } 
        System.exit(0); 
    } 
    void message(String message) { 
        System.out.println("007" + message); 
        JOptionPane.showMessageDialog(null, 
            message,  
            "Timer Alert",                // titlebar 
            JOptionPane.INFORMATION_MESSAGE);    // icon 
    } 
}