[jira] [Created] (DATAFU-50) SimpleEvalFunc should extend ContextualEvalFunc, have good lifecycle hooks

["Philip (flip) Kromer (JIRA)" <ji...@apache.org>]

Philip (flip) Kromer created DATAFU-50:
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             Summary: SimpleEvalFunc should extend ContextualEvalFunc, have good lifecycle hooks
                 Key: DATAFU-50
                 URL: https://issues.apache.org/jira/browse/DATAFU-50
             Project: DataFu
          Issue Type: Improvement
            Reporter: Philip (flip) Kromer


Being able to squirrel away values frozen at frontend-launch-time is very handy. 

This does two things:

* makes SimpleEvalFunc extend ContextualEvalFunc rather than plain-old-EvalFunc. This seems harmless and gains you all that power of Contextualism.
* Adds a hook method "void schemaReadyHook(inputSchema,outputSchema)" to ContextualEvalFunc, called once the schemata are prepared. This acts as sugar for classes that want to set properties at front-end time to be used at later points but which, like most SimpleEvalFunc's, want nothing to do with schema calculation. In ContextualEvalFunc it does nothing; subclasses may override it and if so must call super. schemaReadyHook().



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