MergeName.java 文件源码

public static void main(String[] args) throws Exception {
    if (args.length == 0) {
        test("p1", "read", "write", "delete", "execute");
        test("p2", "read,write", "delete,execute");
        test("p3", "read,write,delete", "execute");
        test("p4", "read,write,delete,execute");
    } else {
        SecurityManager sm = System.getSecurityManager();
        for (String arg : args) {
            // Use bits to create powerset of ALL_ACTIONS
            IntStream.range(1, 16)
                    .mapToObj(n -> IntStream.range(0, 4)
                            .filter(x -> (n & (1 << x)) != 0)
                            .mapToObj(x -> ALL_ACTIONS[x])
                            .collect(Collectors.joining(",")))
                    .forEach(a -> sm.checkPermission(
                            new FilePermission(arg, a)));
        }
    }
}