I'm referring to the java.lang.reflect.InvocationHandler. You can use it create proxy objects for interfaces "on-the-fly". I've used it extensively as a way of adapting mismatched interfaces between objects.
--Kevin -----Original Message----- From: David Graham [mailto:dgraham1980@;hotmail.com] Sent: Wednesday, October 30, 2002 4:35 PM To: [EMAIL PROTECTED] Subject: RE: [OT] Getting a Collection's size in JSTL What is a DynamicProxy? We may be talking about the same pattern with different names. David >From: "Kevin A. Smith" <[EMAIL PROTECTED]> >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> >To: "Struts Users Mailing List" <[EMAIL PROTECTED]> >Subject: RE: [OT] Getting a Collection's size in JSTL >Date: Wed, 30 Oct 2002 16:31:03 -0500 > >This also seems like a good place to use a DynamicProxy. Since most all of >the Java Collections package is interfaced base, this seems like it might >be an elegant solution. > >--Kevin > >-----Original Message----- >From: David Graham [mailto:dgraham1980@;hotmail.com] >Sent: Wednesday, October 30, 2002 3:44 PM >To: [EMAIL PROTECTED] >Subject: Re: [OT] Getting a Collection's size in JSTL > > >That's pretty much what I did except you can only set the internal >collection in the constructor. It's an elegant solution that should >probably (in some form) be included in a larger library. > >David > > > > > > > >From: Kris Schneider <[EMAIL PROTECTED]> > >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> > >To: Struts Users Mailing List <[EMAIL PROTECTED]> > >Subject: Re: [OT] Getting a Collection's size in JSTL > >Date: Wed, 30 Oct 2002 15:30:13 -0500 > > > >It should also be relatively painless to use a composition/delegation > >approach. > > > >public class CollectionBean { > > > > private Collection c; > > > > public int getSize() { > > return this.c.size(); > > } > > > > public void setCollection(Collection c) { > > this.c = c; > > } > > > > public Collection getCollection() { > > return this.c; > > } > >} > > > ><jsp:useBean id="collBean" class="com.foo.CollectionBean"/> > ><c:set target="${collBean}" > > property="collection" > > value="${requestScope.theCollection}"/> > ><c:out value="${collBean.size}"/> > > > >Or something along those lines. Of course, you could completely set up >the > >collection bean prior to hitting the JSP as well. > > > >Quoting David Graham <[EMAIL PROTECTED]>: > > > > > I actually thought of a better idea which is getting into commons > > > collections territory but I'll post a quick description here. I made >a > > > JstlCollectionWrapper class that wraps any Collection object and > >implements > > > > > > the Collection interface. I added a getSize() method to this class. > >The > > > business layer classes can return standard Java collections like > >ArrayList > > > and you can wrap them in this class when using them in JSTL. > > > > > > A similar approach could be taken with the Map interface. I wish they > >would > > > > > > just add getSize to the standard classes :-(. > > > > > > David > > > >-- > >Kris Schneider <mailto:kris@;dotech.com> > >D.O.Tech <http://www.dotech.com/> > > > >-- > >To unsubscribe, e-mail: > ><mailto:struts-user-unsubscribe@;jakarta.apache.org> > >For additional commands, e-mail: > ><mailto:struts-user-help@;jakarta.apache.org> > > >_________________________________________________________________ >Protect your PC - get McAfee.com VirusScan Online >http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963 > > >-- >To unsubscribe, e-mail: ><mailto:struts-user-unsubscribe@;jakarta.apache.org> >For additional commands, e-mail: ><mailto:struts-user-help@;jakarta.apache.org> > > >-- >To unsubscribe, e-mail: ><mailto:struts-user-unsubscribe@;jakarta.apache.org> >For additional commands, e-mail: ><mailto:struts-user-help@;jakarta.apache.org> _________________________________________________________________ Unlimited Internet access for only $21.95/month. Try MSN! http://resourcecenter.msn.com/access/plans/2monthsfree.asp -- To unsubscribe, e-mail: <mailto:struts-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:struts-user-help@;jakarta.apache.org> -- To unsubscribe, e-mail: <mailto:struts-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:struts-user-help@;jakarta.apache.org>
