Synchronous data loading through Firebase

public static <T> T loadSynchronous(final Firebase firebaseLocation, Class<T> clazz) {
    final DataSnapshotWrapper snapshotWrapper = new DataSnapshotWrapper();
    final CountDownLatch latch = new CountDownLatch(1);
    firebaseLocation.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            System.out.println("Location loaded");
            snapshotWrapper.snapshot = dataSnapshot;
            latch.countDown();
        }

        @Override
        public void onCancelled(FirebaseError firebaseError) {
            System.out.println("Error loading location");
            latch.countDown();
        }
        });
    try {
        System.out.println("Prelatch");
        latch.await();
        System.out.println("Returning from latch");
        return snapshotWrapper.snapshot.getValue(clazz);
    } catch (InterruptedException e) {
        e.printStackTrace();
        return null;
    }
}

private static class DataSnapshotWrapper {
    private DataSnapshot snapshot;
}