Re: [Jsdsi-users] extending jsdsi.Tag

[Sameer A. <aj...@cs...>]

Ok, I've just checked a change into CVS that makes toTagSexp protected.

Sameer

> Sameer Ajmani <aj...@cs...> writes:
>
>> Would making toTagSexp() protected solve your problem?  We can
>> probably do this.
>
> yes, it will be perfect.
>
> I think it will allow others to provide specific tags with their own
> intersect() methods without modifying the jsdsi package by extending
> Tag. (again, I don't know if it is a good practice or if it should be
> allowed, but at least i find it useful).
>
>
> guillermo
>
>>
>> Sameer
>>
>>>
>>> Thanks a lot for the answer and the advice,
>>>
>>>> To construct application-specific tags, just use the Tag subclasses.
>>>
>>> I wanted to create a new Tag object because the semantics of my
>>> authorization tag require a different intersect() function. I just
>>> though that I could extend jsdsi.Tag implementing the abstract
>>> methods, and providing my own intersect algorithm for my specific
>>> tag.
>>>
>>> If I implement my own Tag extending jsdsi.Tag I get an error because
>>> I cannot implement the abstract method Tag.toTagSexp(). Making it
>>> public in Tag solves the error, although I don't know if this is a
>>> good practice.
>>>
>>> Thanks again,
>>>
>>> Guillermo
>>>
>>>
>>> Sameer Ajmani <aj...@cs...> writes:
>>>
>>>> Tag.toSexp() returns (tag <tag-material>), while Tag.toTagSexp()
>>>> just returns <tag-material>.  This just matters for when you write
>>>> tags to a file or to the network (you should always use toSexp(), so
>>>> that the receiver knows that it's getting a Tag).  To construct
>>>> application-specific tags, just use the Tag subclasses.  For
>>>> example, a tag like this:
>>>> (tag (file (*set read write) (*prefix /home/ajmani)))
>>>> Is constructed as:
>>>> new SimpleTag("file",
>>>>   new ExprTag[] {
>>>>     new SetTag(new ExprTag[] { new StringTag("read"),
>>>>                                new StringTag("write") }),
>>>>     new PrefixTag("/home/ajmani");
>>>>   };
>>>> ).toSexp();
>>>>
>>>> or parse the original string into an object:
>>>>
>>>> Tag myTag = (Tag)Obj.parseObj
>>>> (new SexpInputString
>>>> (new ByteArrayInputStream
>>>> (Sexp.encodeString
>>>> ("(tag (file (*set read write) (*prefix /home/ajmani)))")
>>>> )).readSexp());
>>>>
>>>> Sameer
>>>>
>>>>> Hi,
>>>>>
>>>>> I have a little question regarding jsdsi.Tag. I need to create an
>>>>> application specific Tag and I was wondering if the abstract class
>>>>> Tag is intended to be extended by external sw packages.
>>>>>
>>>>> If this is the case, the method Tag.toTagSexp() shouldn't it be
>>>>> declared public or protected? In the latests stable version and
>>>>> current CVS version is is package-private. And if this is not the
>>>>> case, which is the best way to implement an application-specific
>>>>> tag?
>>>>>
>>>>>
>>>>> thanks,
>>>>>
>>>>> Guillermo
>>>>>
>>>>> --
>>>>> ---------------------------------------------------------------
>>>>> Guillermo Navarro (gna...@cc...)
>>>>> Phone: +34 93 581 3577
>>>>> FAX: +34 93 581 3033
>>>>> Home: http://www.ccd.uab.es/~guille
>>>>> Combinatoria i Comunicacio Digital (http://www.ccd.uab.es)
>>>>> Universitat Autonoma de Barcelona  - 08193 Bellaterra, Spain
>>>>> ---------------------------------------------------------------
>>>>>
>>>>>
>>>>>
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>>>>
>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>> --
>>> ---------------------------------------------------------------
>>> Guillermo Navarro (gna...@cc...)
>>> Phone: +34 93 581 3577
>>> FAX: +34 93 581 3033
>>> Home: http://www.ccd.uab.es/~guille
>>> Combinatoria i Comunicacio Digital (http://www.ccd.uab.es)
>>> Universitat Autonoma de Barcelona  - 08193 Bellaterra, Spain
>>> ---------------------------------------------------------------
>>
>>
>> http://ajmani.net
>>
>>
>>
>
> --
> ---------------------------------------------------------------
> Guillermo Navarro (gna...@cc...)
> Phone: +34 93 581 3577
> FAX: +34 93 581 3033
> Home: http://www.ccd.uab.es/~guille
> Combinatoria i Comunicacio Digital (http://www.ccd.uab.es)
> Universitat Autonoma de Barcelona  - 08193 Bellaterra, Spain
> ---------------------------------------------------------------


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