Re: How to build a Custom Include method?

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


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