Groups > comp.lang.java.programmer > #6167

Re: JSF 1.2

From	Chris Riesbeck <Chris.Riesbeck@gmail.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: JSF 1.2
Date	2011-07-13 13:17 -0500
Message-ID	<9865pfF2qeU1@mid.individual.net> (permalink)
References	<4e1d5166$0$1538$426a74cc@news.free.fr>

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On 7/13/2011 3:03 AM, Pif - 34 wrote:
> Hello,
>
> I'm working on a project based on JSF1.2. In a XHTML document, I must
> call a method using a parameter.
>
> So, since this is not possible directly using standard syntax, I would
> like to know if one of following solutions is possible that cut be
> usefull in my code:
>
> - use an include of a JSP template that do the code I need to place ? In
> a <html ... > doc, you can only include <html subdocs ?
>
> - include a JSP tag in the <html> that allow to place javacode ?
>
> Do you have Id of workarounds ?

For just one such method, you can create a function you can call in the 
JSP expression language. Just two steps:

   - in an appropriate class, define a static method
   - in a TLD file, declare the function

Details at

   http://download.oracle.com/javaee/1.4/tutorial/doc/JSPIntro7.html


If I have many such methods, I define one "call" method in some utility 
class (error checking code removed) and the associated TLD

   public static Object call(final Object obj, final String methodName, 
final Object arg)
   throws IllegalAccessException, InvocationTargetException, 
NoSuchMethodException {
    return obj.getClass()
              .getMethod(methodName, arg.getClass())
              .invoke(obj, arg);
   }

then I can write expressions like the following, where au is the prefix 
for my tag library:

    "${au:call(user, 'getDomainRoles', domain)}"

to call user.getDomainRoles(domain)

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JSF 1.2 Pif - 34 <fj@nospam.fr> - 2011-07-13 10:03 +0200
  Re: JSF 1.2 Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2011-07-13 13:17 -0500
    Re: JSF 1.2 lewbloch <lewbloch@gmail.com> - 2011-07-13 11:32 -0700
      Re: JSF 1.2 Travers Naran <tnaran@gmail.com> - 2011-07-17 21:54 -0700

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