DirectoryStreamFilters.anyOf and allOf are not safe

[Rémi Forax]

There is three differents bugs :
1) anyOf() of use a raw type as return type:
    <T extends FileRef> DirectoryStream.Filter anyOf(final 
DirectoryStream.Filter<? extends T>... filters)
    --------------------------------------------------------^
    there is no T here !

    This bug is not currently detected by javac but will be soon,
    see http://blogs.sun.com/mcimadamore/entry/diagnosing_raw_types

2) Java doesn't allow to create an array of parameteried types so
    declaring a varargs of parameterized type is not a good idea.
    It's better to use an Iterable here.

3) casting a DirectoryStream.Filter<? extends T> to a
    DirectoryStream.Filter<T> is unsafe and will lead to CCE.
    As Mark Thornton wrote the JDK should use DirectoryStream.Filter<? 
super T>.

anyOf should be written like that:
public static <T extends FileRef> DirectoryStream.Filter<T>
    anyOf(final Iterable<? extends DirectoryStream.Filter<? super T>> 
filters) {
        return new DirectoryStream.Filter<T>() {
            @Override
            public boolean accept(T entry) {
                for (DirectoryStream.Filter<? super T> filter: filters) {
                    if (filter.accept(entry))
                        return true;
                }
                return false;
            }
        };
    }

Rémi