public T withSmallestMappedDouble(Java7DoubleMapper<T> mapper) {
if (used) {
throw new RuntimeException("This stream has already been used.");
}
T smallest = null;
for (T object : collection) {
if (smallest == null || mapper.map(object) < mapper.map(smallest)) {
smallest = object;
}
}
return smallest;
}
public Java7DoubleStream mapToDouble(Java7DoubleMapper<T> mapper) {
if (used) {
throw new RuntimeException("This stream has already been used.");
}
List<Double> newDoubleList = new ArrayList<>();
for (T object : collection) {
newDoubleList.add(mapper.map(object));
}
return Java7DoubleStream.doubleStream(newDoubleList);
}
