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An AspectAdapter instance looks like a ValueHolder
instance from the perspective of a viewer or controller, in that the aspect
adapter handles both value and value: messages. An aspect
adapter contains no value instance variable, however; instead, an
aspect adapter forwards those messages to another model, using a getter and
setter appropriate to that model. Thus, you have the following contrast:
*------------* value: *--------------*
| Controller | ---------> | |
*------------* | |
| Value Holder |
*------------* value | |
| Viewer | <--------- | |
*------------* *--------------*
*------------* value: *----------------* setter *-------*
| Controller | ---------> | | ---------> | |
*------------* | | | |
| Aspect Adapter | | Model |
*------------* value | | getter | |
| Viewer | <--------- | | <--------- | |
*------------* *----------------* *-------*