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From "James Strachan" <james_strac...@yahoo.co.uk>
Subject Re: [BeanUtils] PropertyUtils and DynaBeans (getPropertyDescriptors)
Date Thu, 18 Apr 2002 12:07:56 GMT
From: "James Strachan" <james_strachan@yahoo.co.uk>
> ----- Original Message -----
> From: "Stephen Colebourne" <scolebourne@eurobell.co.uk>
> > This is what I was getting at. If DynaBeans were to become used as the
> main
> > interface (instead of PropertyUtils), then DynaBeans would need to
support
> > this notation.
>
> I think DynaBeans is a great abstraction for DynaBeans and regular beans.
> DynaBeans can handle
>
> * regular properties via get(String name)
> * indexed properties via get(String name, int index);
> * mapped properties via get(String name, String key);
>
> Where DynaBeans are maybe not the best abstraction right now is for
complex
> expressions like one.two[3].four(5).

Incidentally, there's an expression language I refer to as JEL (Java
Expression Language) - I'm hoping the name catches on like JSTL did ;-). Its
used in JSTL, will be native in JSP soon and I think JSF uses it too. Its
quite similar to a superset of the expression language currently supported
by beanutils. Right now it exists in the JSTL reference implementation over
at jakarta-taglibs in the 'standard' taglib and hopefully its gonna move
over to jakarta commons sometime soon.

When JEL moves over here, we're gonna have a seperate commons component for
parsing and evaluating complex expressions on beans, Maps, Lists, arrays
(and hopefully DynaBeans too). So maybe its a good idea to consider
expression languages as being logically seperate from an 'introspection
wrapper'.  i.e. that DynaBeans can be used as a great wrapper around
introspection while supporting new features like mapped properties and
DynaBeans themselves too and that expression languages should be used
seperately, either via the API in beanutils right now or the JEL which will
arrive here later.

Does that sound a reasonable strategy?

James




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