Re: How to build a Custom Include method?

Sorry for the very delay replied. Anyway, I can't wait to upgrade my code to
Freemarker 2.4.x, so, I will manage the x=.. for now.

On Fri, Aug 1, 2008 at 2:04 AM, Daniel Dekany <[email protected]> wrote:

> Wednesday, July 30, 2008, 7:12:09 PM, Jeremy Chone wrote:
>
> > Thanks all for the response. This helps a lot, I think I have everything
> I need.
> >
> > Here are my quick answers to some of your points:
> >
> > To JR about TemplateLoader: Yes, usually the right way of doing
> > this would be a template loader. However, in my case the template
> > can depend on many other states that cannot easily be encoded in a
> > simple string.  For example, I might choose a different template
> > depending of the httpSession states (or cookies values) or from
> > where the template is being included included.
> >
> > To Attila about getEnvironment: This is perfect. I will get the writer
> from the Environment.
> >
> > To Daniel about TemplateDirectiveModel: Cool, makes total sense,
> > TemplateDirectiveModel is what I need. Is that equivalent to
> > creating a macro?
>
> I should be, but in 2.3.x positional parameter passing (like
> <@foo 1 2 /> instead of <@foo x=1 y=2 />) is not supported for them,
> as the parameters are received with a Map. Starting from 2.4 it's solved
> with Java 5 annotations. I think it would really be good to backport
> that... but as we can't require Java 5 for 2.3.x, it would be tricky.
> But really, Jonathan, can't we add an interface for the same purpose?
> Then it would be usable in 2.3.x as well.
>
> > I assume I use the Configuration.setSharedVariable method.
>
> That's a possible approach. Another one is to put it into an
> #import-able/#include-able file, like if it were a macro. That's
> possible as <#assign foo = "com.example.FooDirective"?new()>.
>
> > Jeremy,
> >
> >
> >
> >
> > On Wed, Jul 30, 2008 at 3:54 AM, Daniel Dekany <[email protected]>
> wrote:
> > Wednesday, July 30, 2008, 7:12:31 AM, Jeremy Chone wrote:
> >
> >> Hi,
> >>
> >> I would like to build a custom include method. Basically, I would
> >> like to be able to call something like:
> >>
> >> ${customInclude(param1,param2)}
> >>
> >> which will include a template almost as a traditional [#include
> >> does. There are two main differences between this customInclude and
> >> a traditional freemarker include:
> >>
> >> 1) customInclude add another level of indirection to get to the
> >> template name (handled by java business objects)
> >>
> >> 2) Each customInclude might have a different model.
> >>
> >> Today, I have an implementation that works. Basically, I
> >> implemented an TemplateMethodModelEx method (customInclude)
> >
> > It should be a TemplateDirectiveModel, not a TemplateMethodModelEx.
> > Thus it is to be called as <@customInclude param1 param2 />, not as
> > ${customInclude param1 param2}. Directives are for output
> > progressively and without escaping. Interpolations (${...}) are to
> > insert the result of simpler expressions, possibly escaped. Anything
> > you do with ${...} should not have a side-effect, so it should fiddle
> > with the output Writer. Like consider what would happen with your
> > solution here: <#assign s = "The output is: ${customInclude(...)} ">.
> > It wouldn't work correctly, "s" would be "The output is: ", etc.
> >
> >> which implements the logic to get the template name, and get the
> >> "Writer" object from the param. Then, I just get the template and
> >> call template.process with the givent Writer.
> >
> > (The Writer can be get as the others has already told... your
> > customInclude method could be called directly by the users.)
> >
> >> It's ugly, but it work. I hide this method with a macro, so, as the
> >> pages do not have too now about the Writer object/param.
> >>
> >> Is there better way for doing this? Can I get some more context in a
> TemplateMethodModelEx method ?
> >>
> >>
> >> Jeremy,
> >
> > --
> > Best regards,
> >  Daniel Dekany
> >
> >
> >
>
> --
> Best regards,
>  Daniel Dekany
>
>

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