Re: [Jsdsi-users] extending jsdsi.Tag

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

Would making toTagSexp() protected solve your problem?  We can probably do
this.

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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>>
>>
>> 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
> ---------------------------------------------------------------


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