Re: How to stop (w/o exception)

On Tue, Feb 26, 2008 at 6:48 PM, Newman, John W <[email protected]> wrote:
> Instead of the macro I'd just put it in an if statement.  Maybe I can try/catch stop exception in my servlet, but I may not always want to catch that.  There should be a [#abort /] directive or something to do that.

Well, one possibility is that you use [#stop "graceful"] when you
intend for the exception to be ignored. And then in the java code, you
could:

try {
   ....
   template.process(dataModel,out);
   ...
} catch (StopException stop) {
    if !("graceful".equals(stop.getMessage()) throw stop;
}

so you rethrow the exception unless the detail string associated with
it is "graceful".

In any case, Attila's suggestion of using a macro in conjunction with
#return also works internally by throwing an exception except that it
gets caught , so it unwinds to the point where the macro was called.
You know, again, AFAICS, the only way to jump out of an arbitrarilly
nested structure is by throwing an exception.


>
>
>
>
>  -----Original Message-----
>  From: [email protected] [mailto:[email protected]] On Behalf Of Attila Szegedi
>  Sent: Tuesday, February 26, 2008 12:44 PM
>  To: FreeMarker-user
>  Subject: Re: [FreeMarker-user] How to stop (w/o exception)
>
>  You could enclose your template body in a:
>
>  [#macro actuallyRenderThePage]
>  ...
>  [/#macro]
>  [@actuallyRenderThePage/]
>
>  and then use [#return] from within the macro body. Of course, that
>  doesn't address more complex situations, as stopping gracefully from
>  several levels of macros or includes. In these cases [#stop/] is the
>  only reliable mechanism -- you'll just have to catch and ignore it at
>  your point of Template.process() invocation...
>
>  Attila.
>
>  On 2008.02.26., at 17:44, Newman, John W wrote:
>
>  > Hi,
>  >
>  > I tried searching but sourceforge is down... I'm sure this has been
>  > discussed before.
>  >
>  >
>  > We have the [#stop /] directive which throws an exception.  Is there
>  > a way to stop processing gracefully?
>  >
>  >
>  > [#if somethingBad]
>  >    [#stopGracefully /]
>  > [/#if]
>  >
>  > Sure I could do
>  >
>  > [#if ! somethingBad]
>  >    Everything here
>  > [/#if]
>  >
>  > But I'm pretty sure there is a break or stop thing that should work
>  > here.  Just wondering, thanks.
>
>
>
>
>
>
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