enhance ExpressionEvaluator
---------------------------
Key: TAPESTRY-962
URL: http://issues.apache.org/jira/browse/TAPESTRY-962
Project: Tapestry
Type: Improvement
Components: Framework
Versions: 4.0.2
Reporter: Norbert Sándor
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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