Re: [Jsdsi-users] extending jsdsi.Tag

[Guillermo N. <gna...@cc...>]

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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>
>
> http://ajmani.net
>
>
>
>
>
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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
---------------------------------------------------------------