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Posted to dev@tapestry.apache.org by "Howard M. Lewis Ship (Created) (JIRA)" <ji...@apache.org> on 2012/01/24 20:48:41 UTC

[jira] [Created] (TAP5-1829) Extend property expression language to include named functions

Extend property expression language to include named functions
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                 Key: TAP5-1829
                 URL: https://issues.apache.org/jira/browse/TAP5-1829
             Project: Tapestry 5
          Issue Type: New Feature
          Components: tapestry-core
    Affects Versions: 5.4
            Reporter: Howard M. Lewis Ship
            Priority: Minor


It would be nice to by able to define, as a service contribution, a function that could be referenced inside a property expression. This could be used for frequent operations such as sorting a collection, or defaulting null values.

It's a bit tricky, since the property expression language is generics aware; the function provided (possibly: a static method on a class) would also need to support generics.

Currently, this can be done in Java code, but it either leads to heavy base classes (providing utility methods) or some ugly repetition.

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