@Override
public long reduce(long identity, LongBinaryOperator op) {
return performOperation(
TerminalFunctions.reduceFunction(identity, op),
true,
(i1, i2) -> op.applyAsLong(i1, i2),
null);
}
@Override
public OptionalLong reduce(LongBinaryOperator op) {
Long result =
performOperation(
TerminalFunctions.reduceFunction(op),
true,
(i1, i2) -> {
if (i1 != null) {
if (i2 != null) {
return op.applyAsLong(i1, i2);
}
return i1;
}
return i2;
},
null);
if (result == null) {
return OptionalLong.empty();
} else {
return OptionalLong.of(result);
}
}