On Mon, Dec 29, 2008 at 8:27 PM, Erik Hatcher
e...@ehatchersolutions.com wrote:
Thanks, good pointers!IncludeNotFound looks like it'd do the trick, but
for every #parse, not just the one I want to make conditional.
Yeah, a tool approach would probably better fit your use case. It
could be pretty simple:
public class IncludeTool {
private VelocityEngine engine;
public void setVelocityEngine(VelocityEngine engine) {
this.engine = engine;
}
public Boolean exists(String name) {
if (engine == null) {
return null;
}
try {
return engine.resourceExists(name);
} catch (ResourceNotFoundException rnfe) {
return false;
}
}
}
Of course, if you're using VelocityTools, you could even have this
automatically configured and available in all your templates (for
Tools 1.x it'd take a little refactoring).
Why is it that $engine.resourceExists($template) throws an exception rather
than returning false?
I'm not really sure. That suprises me and seems wrong. If you would
open a JIRA issue for it, i'd try to look into it this week.
Erik
On Dec 29, 2008, at 3:22 PM, Nathan Bubna wrote:
There's no canonical way of doing this within a template yet, but
there is the IncludeEventHandler which was added in Velocity 1.5.
There is even an IncludeNotFound implementation provided. You may be
able to set up a simpler, exception free solution using those.
Alternately, you could pretty easily create a VelocityTool that did
this.
On Mon, Dec 29, 2008 at 4:10 AM, Erik Hatcher
e...@ehatchersolutions.com wrote:
Hi,
I'd like to have some construct like this in a template:
#if(templateExists($template))
#parse($template)
#end
Is there a canonical/approved way of doing this? I've put the
VelocityEngine into the context and tried:
#if($engine.resourceExists($template))
...
#end
But that still throws an exception when $template does not exist. I want
to
avoid the exception and simply skip #parse'ing if a template does not
exist
Thanks,
Erik
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