Java 8 filters are based on Boolean values

I want to be able to apply filters based on incoming Boolean values

public static List<Integer> multiplyNumbers(List<Integer> input,boolean ignoreEven){

    return input.stream()
    .filter(number -> !(number%2==0))
    .map(number -> number*2)
    .collect(Collectors.toList());
}

I want to filter according to the ignoreeven flag If true, ignore even numbers What should I do? I did this to avoid code duplication

Solution

It sounds simple or conditional to me

.filter(number -> !ignoreEven || (number % 2 != 0))