Re: Formatting a date

On Mon 27 March 2006 11:28, Marc Palmer wrote:
> On 27 Mar 2006, at 11:13, Alex Twisleton-Wykeham-Fiennes wrote:
> > On Mon 27 March 2006 11:00, Marc Palmer wrote:
> >> On 27 Mar 2006, at 02:47, Sven Schliesing wrote:
> >>> That's exactly what I looked for.
> >>
> >> There's another, potentially cleaner way...
> >>
> >> ----------------- "mymacros.wmm":
> >>
> >> #macro formatDate($d)
> >>     $Text.formatDate($d, "dd.MM.yyyy, HH:mm")
> >> #end
> >>
> >> ----------------- "yourtemplate.wmt":
> >>
> >> #include as macro "mymacros.wmm"
> >>
> >> #formatDate($createdAt)
> >
> > Just to jump in for a moment - this will create a new
> > SimpleDateFormat object
> > every single time that it is invoked.  If you know that you are
> > going to be
> > formatting a lot of different dates with the same format then it is
> > considerably more efficient to drop in a dedicated wrapper around
> > an instance
> > of SimpleDateFormat that gives you the format that you want as
> > otherwise each
> > time that you invoke it, it will have to parse your "dd.MM.yyyy,
> > HH:mm"
> > format string, build the internal representation and then format
> > the Date
> > which is relatively expensive.
>
> You're absolutely right, but that can be dealt with using a macro
> plus a #bean to create a "static" shared instance of the formatter?

I'll also look at making $Text.formatDate cache the SimpleTextFormat objects 
that it creates and run some profiling to see whether or not this is really 
an advantage...

A

> Of course then this offers little benefit, if not making things
> worse, over using Keats' #bean approach...
>
> #formatDate($createdAt)
>
> vs.
>
> $sharedFormatter.format($createdAt)
>
> ...and with my own caveats about using "directive" style macros I
> think the latter, Keats' scenario is better.
>
> Ahhhh now I'm thinking in Spring terms, and changing the topic... hmm
> it would be really nice if we could add some kind of context provider
> that populates the context with all the beans from a Spring
> BeanContext :)
>
> Cheers
>
>
>
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