Yes, that's perfect, didn't know about that. Thanks Craig! Frank
-- Frank W. Zammetti Founder and Chief Software Architect Omnytex Technologies http://www.omnytex.com AIM: fzammetti Yahoo: fzammetti MSN: [EMAIL PROTECTED] Java Web Parts - http://javawebparts.sourceforge.net Supplying the wheel, so you don't have to reinvent it! On Thu, June 1, 2006 2:36 pm, Craig McClanahan wrote: > On 6/1/06, Frank W. Zammetti <[EMAIL PROTECTED]> wrote: >> >> Hi, >> >> I'm struggling a bit with something, and I think I may be making it >> harder >> than it is. Here's my requirement... >> >> I need to be able to take an arbitrary bean, and given the name of a >> field >> in it, determine whether the field is (a) a simple scalar (i.e., String >> for istnance), (b) a subclass of List, (c) a subclass of Map or (d) an >> array (of any type). >> >> I've been playing with PropertyUtils.getPropertyDescriptor(), but I've >> kind of gotten stumped where to go after that... I've toyed with getting >> the Class from that, playing with getName() and getInterfaces(), both of >> which get me close, but I'd have to do string comparisons, which isn't >> the >> right answer I think... I've also thought of getting an instance from >> the >> Class, then doing a simple instanceof, but of course this won't work for >> Maps and Lists since they can't be instantiated. >> >> Like I said, I think I may be over-thinking this a bit, hopefully >> someone >> can quickly set me straight. Also, while I suspect Beanutils will make >> this easier, I don't so much care if I use it or not :) It just seemed >> the natural choice. Thanks! > > > You are probably looking for the isAssignableFrom() method on > java.lang.Class, which is the runtime analog to the "instanceof" compile > time check. To see if a particular class is a Map (or an impementation of > Map), do something like this: > > Class clazz = ...; > if (Map.class.isAssignableFrom(clazz)) { > ... yes, this is a Map ... > } else { > ... no, it is not ... > } > > Craig > > > > -- >> Frank W. Zammetti >> Founder and Chief Software Architect >> Omnytex Technologies >> http://www.omnytex.com >> AIM: fzammetti >> Yahoo: fzammetti >> MSN: [EMAIL PROTECTED] >> Java Web Parts - >> http://javawebparts.sourceforge.net >> Supplying the wheel, so you don't have to reinvent it! >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
