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From Henri Yandell <bay...@generationjava.com>
Subject Re: new project proposal: Type Conversion Library
Date Mon, 19 Jan 2004 23:17:04 GMT

Yep, [convert] exists in the sandbox and I've been moving forward with it
in my usual way, which means I find a way to use it in some non-apache
project of mine and just see how it goes. I've got it attached to two
projects, but it's not being used in anger in them yet.

The code is based on the beanutils code, with a new lookup mechanism. I'm
happy to mentor any further work on it, so you won't get abandoned without
the ability to add patches etc.

Hen

On Mon, 19 Jan 2004, robert burrell donkin wrote:

> hi ron
>
> IIRC there is a proto-project in the sandbox along these lines called
> convert. convertutils (in beanutils) is ok but is handicapped by
> backwards compatibility. it's been lacking momentum for some while but
> it's might be easier to revive that project that create a new one.
>
> it's probably good that you don't have much code (just - hopefully -
> enthusiasm) since that avoids any thorny questions of importing
> external code. i'd suggest that you take a look at the convert project
> and about ways to take it forward. then next phase would be writing
> some patches and submitting them. (it might be wise to see whether they
> are any committers willing to act as mentors for convert before putting
> too much work in.)
>
> here are some urls:
>
> http://jakarta.apache.org/commons/volunteering.html
> http://jakarta.apache.org/commons/patches.html
> http://jakarta.apache.org/site/getinvolved.html
>
> but there's quite a lot else on the web site and the wiki if you're
> willing to look hard enough.
>
> - robert
>
> On 19 Jan 2004, at 22:07, Ron Blaschke wrote:
>
> > I am posting this here because I think commons would be the
> > right place to put such a library.  Please tell me if it's not.
> >
> > The idea is to allow conversion for (almost?) any object into another.
> > I'd like to see code such as this working:
> >
> > Object a = new Integer(10);
> > Object b = "120";
> >
> > assertEquals(new Integer(10),
> >              TypeConverter.convert(a, Integer.class));
> > assertEquals(new Integer(120),
> >              TypeConverter.convert(b, Integer.class));
> >
> > Of course, it should be extensible, and maybe allow for transitive
> > conversions, eg
> >
> > class Seconds extends Time {}
> > TypeConverter.registerConverter(Integer.class, Seconds.class, /* some
> > converter object here */);
> >
> > assertEquals(new Seconds(25), TypeConverter.convert("25",
> > Seconds.class); /* done via String -> Integer -> Seconds conversion */
> >
> > Or add some constraint checking:
> > System.out.println(new Integer(128).byteValue()); /* prints -128; is
> > that what you wanted? */
> >
> > Currently, I have only my ideas to donate (ie, no code yet), and have
> > not previously contributed to jakarta, so any guidance is appreciated.
> >
> > Thanks,
> > Ron
> > --
> >
> >
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>
>
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