[ http://issues.apache.org/jira/browse/TAPESTRY-962?page=all ]
Jesse Kuhnert updated TAPESTRY-962:
-----------------------------------
Fix Version/s: 4.1.2
> enhance ExpressionEvaluator
> ---------------------------
>
> Key: TAPESTRY-962
> URL: http://issues.apache.org/jira/browse/TAPESTRY-962
> Project: Tapestry
> Issue Type: Improvement
> Components: Framework
> Affects Versions: 4.0.2
> Reporter: Norbert Sándor
> Fix For: 4.1.2
>
>
> ExpressionEvaluator abstracts OGNL by providing an OGNL independent interface
> for evaluating expressions. It is very useful not only for bindings but for
> custom usage as well. I'd like to propose some enhancements to make it more
> useable:
> - add more configuration options, for example allow specifying a custom OGNL
> class resolver
> - allow custom context variables like
> public Object read(Object target, String expression, Map<String, ?>
> variables);
> The values in "variables" would be accessible as OGNL global
> variables, eg. #mycustomvariable
> For more information see
> http://www.ognl.org/2.6.9/Documentation/html/LanguageGuide/varref.html
> (- maybe the interface should be renamed to OgnlExpressionEvaluator)
> (- maybe there could be configurable default variables when evaluating
> bindings, like #locale -> requestCycle.engine.locale. These would help for
> application developers to simplify the page files. I know that it is another
> way to implement existing functionality - <inject> - but maybe it would be
> useful.)
> The two latter are only quick ideas but the rest would be very useful!
> If you think so then I send my own ExpressionEvaluator implementation (which
> is compatible with the current one in Tapestry).
> Regards,
> Norbi
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