public void start() {
        if (started) {
            throw new IllegalStateException();
        }
        started = true;
        request = index.browseAsync(query, requestOptions, completionHandler);
    }
public void start ( ) { if ( started ) { throw new IllegalStateException ( ) ; } started = true ; request = index . browseAsync ( query , requestOptions , completionHandler ) ; }
Start the iteration.