package org.apidesign.extensionpoint;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.List;

 import javax.swing.JOptionPane;

 import org.apidesign.extensionpoint.api.TipOfTheDay;

 import org.openide.util.Lookup;

 public class Main {

     public static void main(String[] args) {

         for (;;) {

             // BEGIN: extension.point.Query

             Collection<? extends TipOfTheDay> all = 

                 Lookup.getDefault().lookupAll(TipOfTheDay.class);

             List<TipOfTheDay> arr = new ArrayList<TipOfTheDay>(all);

             Collections.shuffle(arr);

             String msg;

             String title;

             int type;

             if (arr.isEmpty()) {

                 msg = "I do not know what to say!";

                 title = "No provider registered";

                 type = JOptionPane.WARNING_MESSAGE;

             } else {

                 msg = arr.get(0).sayHello();

                 title = "Selected from " + arr.size() + " providers";

                 type = JOptionPane.INFORMATION_MESSAGE;

             }

             // END: extension.point.Query

             String again = "Once Again";

             String exit = "Exit";

             String[] options = new String[] { again, exit };

             int ret = JOptionPane.showOptionDialog(

                 null, msg, title, 0, type, null, options, exit

             );

             if (ret != 0) {

                 break;

             }

         }

         System.exit(0);

     }

 }