So that means that if an ${...} throws InvalidReferenceException, the
TemplateExceptionHandler (see Configuration.setTemplateExceptionHandler)
should suppress the exception, and print the source code quotation of the
interpolation. The last is currently not supported, but maybe not that hard
to add. Like, maybe, the TemplateException that we handle could provide the
quotation.
What if you have ${existingVar + missingVar}?
A further complication... what if the problem is in a directive, like <#if
variableB = 'x'>. I think then we have to fail the template, as we can't
decide if the inside of the #if had to be executed now, or not. Same
problem with custom directives.
On Mon, Sep 18, 2023 at 6:03 PM Christoph Rüger <c.rue...@synesty.com>
wrote:
> Hi,
> we may have a rather special case and are looking for ideas.
> We would like to to keep the placeholders as they are in case of null
> values.
>
> Assume the following template:
>
> ${metaHeaderDataA}
> ${variableB}
>
> We would like the following behavior:
>
> *1st render phase:*
> data.put("metaHeaderDataA", "foo")
> environment.process(template);
>
> Expected Output:
> foo
> ${variableB}
>
> The we want to render this output again with:
>
> *2nd render phase:*
> data.put("variableB", "bar")
> environment.process(template);
>
> Expected final Output:
> foo
> bar
>
> As you see there 2 two rendering phases involved. In phase 1 only some
> variables are known (metaHeaderDataA).
> The other variables come later.
> We would like keep the placeholders in the 1st rendering phase, if there is
> no value or null value in the data model, so that they can be rendered
> later.
>
> I think this is very special.
> So I am just thinking, is this something which could (theoretically) be a
> configurable option maybe on a per-Template-object level (Java Code)? Or is
> this something impossible to do?
>
> Or any other workaround ideas?
>
>
> Thanks
> Christoph
>
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--
Best regards,
Daniel Dekany
