[stringtemplate-interest] Conditionally included subtemplates?

[Terence Parr]

Yeah, it throws an exception for missing properties. a quirky thing but my view of the past was that a missing method or field was a programming error; in ST v4 coming soon to a theater near you, this does not generate an exception
Ter
On Feb 5, 2011, at 10:26 PM, erwin.mueller at deventm.org wrote:

> Hello,
> 
>    I'm a new user of StringTemplate and so far I have manage my simple
> templates w/o any problems. But I wonder in a template like [1] I understood the
> documentation that the subtemplate will be included if the attribute ``address''
> exists. Why do I get then NoSuchFieldException [2]? My classes are like in [3]
> where ``httpd'' is an object of classes implementing the ``HttpdDirective''
> interface.
> 
>    I understood the documentation ``IF actions test the presence or absence of
> an attribute unless the object is a Boolean/bool, true".
> For example,"$if(!member)$...$endif$".'' Presence or absence is for me whether
> the object have the attribute or not. What is the documentation understands as
> ``presence'' or ``absence''?
> 
> Kind regards, Erwin.
> 
> [1]
> domains(httpd) ::= <<
> \<!-- domains --\>
> <httpd.directives:{<if(it.address)>{NameVirtualHost <it.address><\n>}<endif>}>
>>> 
> 
> [2]
> Class
> com.globalscalingsoftware.sscontrol.cli.internal.application.services.httpd.
> directives.SetupJkWorkerDirective$$EnhancerByGuice$$f9c51395 has no such
> attribute: address in template context [httpd_default domains anonymous]
> java.lang.NoSuchFieldException: address
> 
> [3]
> public interface HttpdDirective {
> 
>    String getTemplateName();
> 
>    HttpdDirective setProperty(String name, Object value);
> 
> }
> 
> public class DomainDirective implements HttpdDirective {
> 
>    public String getAddress() {
>        return address;
>    }
> 
> }
> 
> public class SetupJkWorkerDirective implements HttpdDirective {
>    // no getAddress() method
> }
> -- 
> Erwin Mueller, erwin.mueller at deventm.org
> http://www.global-scaling-institute.de/
> http://www.deventm.org
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