// Returns true iff all items in subset are in superset, treating null and
// empty collections as
// the same.
public static <T> boolean isSubset(Collection<T> subset, Collection<T> superset) {
if ((superset == null) || (superset.size() == 0)) {
return ((subset == null) || (subset.size() == 0));
}
HashSet<T> hash = new HashSet<T>(superset);
for (T t : subset) {
if (!hash.contains(t)) {
return false;
}
}
return true;
}
private void onFriendPickerDone(FriendPickerFragment fragment) {
FragmentManager fm = getSupportFragmentManager();
fm.popBackStack();
String results = "";
Collection<GraphUser> selection = fragment.getSelection();
if (selection != null && selection.size() > 0) {
ArrayList<String> names = new ArrayList<String>();
for (GraphUser user : selection) {
names.add(user.getName());
}
results = TextUtils.join(", ", names);
} else {
results = "no friends";
}
showAlert("rar", results);
}
/**
* Gets the currently-selected place.
*
* @return the currently-selected place, or null if there is none
*/
public GraphPlace getSelection() {
Collection<GraphPlace> selection = getSelectedGraphObjects();
return (selection != null && !selection.isEmpty()) ? selection.iterator().next() : null;
}
public static <T> boolean isNullOrEmpty(Collection<T> c) {
return (c == null) || (c.size() == 0);
}