Re: Default permission: "*" or "-"

Simone,

[email protected] wrote:
>> > The spec says ("Foo", null, null) == "Foo#-[-]".
>> >
>> > I would have preferred that the specification said
>> >
>> > ("Foo", null, null) == "Foo#*[*:*]"
>> >
>> > but there it is (and I think it's a mistake).
>>
>>This is just a convention we had to choose to define the meaning of a null
>>value in a NEED permission.
>>
>>We had 2 possibilities:
>>
>>(1) null in NEED permission means "-"
>>
>>or
>>
>>(2) null in NEED permission means "*"
>>
>>We finally implemented (1) but I don't think this was a mistake. In fact,
>>I
>>see more precise to associate "null" with "nothing allowed" than "null"
>>with
>>"all allowed".
> 
> I agree that this is a convention.
> It's just I would have preferred null == "*", but that also is my opinion :)

This is not just a question of opinion.  We need a way to say "no 
ObjectName" and a way to say "all ObjectNames".  There is already a way 
to say "all ObjectNames", namely ObjectName("*:*").  But there is no way 
to say "no ObjectNames", so we use null for that.

Regards,
Éamonn McManus   JMX Spec Lead   +33 476 188 352


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