Remove cumulate from Stream interface (original) (raw)

Remi Forax forax at univ-mlv.fr
Wed Dec 5 06:33:02 PST 2012

I maybe wrong but there is a simple way to implement cumulate() using map(), so I'm not sure cumulate pull its own weight.

Rémi

public final Stream cumulate(final BinaryOperator operator) { return map(new Mapper<U,U>() { private Object accumulator = NO_VALUE;

     @Override
     public U map(U element) {
         Object acc = accumulator;
         if (acc == NO_VALUE) {
             return element;
         }
         acc = operator.operate((U)acc, element);
         accumulator = acc;
         return (U)acc;
     }
 });

}

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