Re: Using different exposure levels for different template data

Wednesday, June 9, 2010, 12:15:44 AM, Rebecca Younes wrote:

> I want most of my template data to be read-only, so I set the
> exposure level of the configuration’s object wrapper to
> EXPOSE_PROPERTIES_ONLY. I have a couple of special lists that I want
> the templates to be able to add to. The only way I see to do this is
> temporarily swap in a different object wrapper, add those objects to
> the template, and then restore the original object wrapper.

You can't swap the object wrapper in the Configuration, unless you
only access it from a single thread. You can, however, wrap those
object before you put them into the data-model, in which case the
object wrapper that the Configuration stores will not touch them, snce
they are already TemplateModel-s. This still can have *some*
performance implications, because the two wrappers will use separate
caches. I wonder if mixing object wrapped by two different
BeansWrappers can cause other issues as well, but that only Attila
could tell. I believe there shouldn't be any more issues anyway.

> Is there a more elegant way to do this?

In principle you should use a customized object wrapper (extending the
BeansWrapper class and like). While this kind of flexibility is an
important point of the object wrapping facility, I think for most
users it's too difficult. So, there is also the possibility of adding
some custom TemplateDirectiveModel-s (that's quite easy) which
internally extract the wrapped object so can use their original Java
API. Then in the template you could write something like:
<@my.add list=myList item=myItem />

> I don’t want to use a different configuration because all the other
> properties of the configuration should remain the same.
>
> Thanks.
>
> Rebecca 
-- 
Best regards,
 Daniel Dekany


------------------------------------------------------------------------------
ThinkGeek and WIRED's GeekDad team up for the Ultimate 
GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the 
lucky parental unit.  See the prize list and enter to win: 
http://p.sf.net/sfu/thinkgeek-promo