public interface ICellEditorValidator
This interface should be implemented by classes that wish to act as cell editor validators.
String isValid(Object value)
null
means valid, and non-null
means
invalid, with the result being the error message to display
to the end user.
It is the responsibility of the implementor to fully format the message before returning it.
value
- the value to be validatednull
indicating
that the value is valid
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