// Demonstrates some fun analysis on Facebook data.
// To use, first download the RestFB library from http://restfb.com/
// In Eclipse, right click on your project and go to Properties
// Then, access Java Build Path > Libraries and click on the "Add External Jar" button
// Select the library's jar file.
// You'll also need a temporary access token from Facebook (see below)
import java.util.*;
import com.restfb.*;
import com.restfb.types.*;

public class FacebookGraphAPI {
   public static void main(String[] args) {
      // get your own temporary access token from
      // http://developers.facebook.com/tools/explorer/
      String token = "MY TOKEN";
      FacebookClient facebookClient = new DefaultFacebookClient(token, Version.LATEST);

      // quick test
      User me = facebookClient.fetchObject("me", User.class);
      System.out.println(me.getName());

      Connection<User> connection = facebookClient.fetchConnection("me/friends",
            User.class, Parameter.with("fields", "name, first_name, location"));
      System.out.println("Total friends: " + connection.getTotalCount());
      
      // See who my friends are
      for (List<User> friendList : connection) {
          for (User friend : friendList) {
              System.out.println(friend.getName());
          }
      }    
      
      // See where my friends are
      Map<String, Integer> locationCounts = new HashMap<String, Integer>();
      for (List<User> friendList : connection) {
          for (User friend : friendList) {
              if (friend.getLocation() != null) {
                  String location = friend.getLocation().getName();
                  if (locationCounts.containsKey(location)) {
                      locationCounts.put(location, locationCounts.get(location) + 1);
                  } else {
                      locationCounts.put(location, 1);
                  }
              }
          }
      }
      System.out.println(locationCounts);
      
   }
}