Version checking codegen cleanup
--------------------------------

         Key: BEEHIVE-135
         URL: http://nagoya.apache.org/jira/browse/BEEHIVE-135
     Project: Beehive
        Type: Bug
  Components: Controls  
    Versions: V1Alpha    
    Reporter: Kyle Marvin
 Assigned to: Kenneth Tam 
    Priority: Minor
     Fix For: V1Alpha


The code generated static initialization code that does version checking for 
ControlBeans could be made better in a couple of ways:

- the code generated by the enforceVersionRequired macro should be selectively 
generated.   There is no reason to generate class load time version checking if 
there is no @VersionRequired annotation on the associated ControlExtension.

- the ControlInterface to version check against can be (and should) be 
determined at codegen time and not runtime.   The call to 
ControlBean.getMostDerivedInterface can be replaced by directly injecting the 
(versioned) ControlInterface class name.  This is a) simpler, and b) safer, 
because having the class you are version checking against be dynamic doesn't 
really make sense.

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