private static String optDoubleToStr(final OptionalDouble optDouble) {
        return optDouble.isPresent()
                ? DECIMAL_FORMAT.format(optDouble.getAsDouble())
                : "-";
    }
Selects an item from the list containing more than one item.

@param filteredList Will not be null or empty
@return An item from the list. If one can't be selected then return null
and the fallback selector (if provided) will be used instead.
stroom-util/src/main/java/stroom/util/io/capacity/AbstractSelector.java