Re: [Jsdsi-users] extending jsdsi.Tag

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

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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