This selector has one other selectors whose meaning it inverts. It actually relies on NoneSelector for its implementation of the isSelected() method, but it adds a check to ensure there is only one other selector contained within.
Convert the Selectors within this container to a string. This will just be a helper class for the subclasses that put their own name around the contents listed here.
<p>This implementation validates the container by calling verifySettings() and then validates each contained selector provided that the selector implements the validate interface.
Check to see whether any DataType we hold references to is included in the Stack (which holds all DataType instances that directly or indirectly reference this instance, including this instance itself).
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This selector has one other selectors whose meaning it inverts. It actually relies on NoneSelector for its implementation of the isSelected() method, but it adds a check to ensure there is only one other selector contained within.