Converting this function to using generics
public static <T extends Enum<T> & SomeInterface> EnumSet<T> convertToES(long val) {
  EnumSet<T> es = EnumSet.noneOf(T.class);

  for(T t : values()) {
      if(t.getSomeProperty() > 0)
        es.add(t);
  }


  return es;
}

public static EnumSet<SomeType> convertToES(long val) {
        EnumSet<SomeType> es = EnumSet.noneOf(SomeType.class);

        for (SomeType p : values()) {
            if (p.getSomeThing())) > 0) {
                es.add(p);
            }
        }

        return es;
    }

public static <T extends Enum<T> & SomeInterface> EnumSet<T> convertToES(
    long val,
    Class<T> tClass)
{
    EnumSet<T> es = EnumSet.noneOf(tClass);

for(T t : tClass.getEnumConstants()) {
        ....

public static <T extends Enum<T> & SomeInterface> EnumSet<T> convertToES(Class<T> clazz, long val) {

    EnumSet<T> es = EnumSet.noneOf(clazz);

    for(T t : clazz.getEnumConstants()) {
        if(t.getSomeProperty() > 0)
          es.add(t);
    }
    return es;
  }

public static <T extends Enum<T> & SomeInterface> //
        EnumSet<T> convertToES(Class<T> tClass, long val) {
    EnumSet<T> set = EnumSet.noneOf(tClass);
    for (T t : EnumSet.allOf(tClass)) {
        if (t.getSomeProperty() == val) {
            set.add(t);
        }
    }
    return set;
}

EnumSet<Foo> x = convertToES(Foo.class, 3);

for(Foo suitableFoo: convertToES(Foo.class, 5)) {
    print(suitableFoo + " has a property of 5!");
}