how to convert datastream to collection

[subash basnet]

Hello all,

Suppose I have the datastream as:
DataStream<Tuple2<String,Point>> *newCentroids*;

How to get collection of *newCentroids * to be able to loop as below:
 private Collection<Tuple2<String,Point>> *centroids*;
 for (Centroid cent : *centroids*) {
  }



Best Regards,
Subash Basnet