Github user revans2 commented on the pull request:
https://github.com/apache/storm/pull/785#issuecomment-146249930
Could we use nested annotations for the complex types?
https://blogs.oracle.com/toddfast/entry/creating_nested_complex_java_annotations
```
@MapType(key=@StringType, value=@NumberType)
public static final ...;
```
instead of
```
@MapOfStringToNumberValidator
```
We might be able to add in an `@Or` annotation so we could get some of the
complex validators to be built up from smaller validators. So we don't need a
once off Validator.
```
@StringOrStringListValidator
```
would become
```
@OR(@StringType, @ListType(@StringType))
```
To me this just gives users better options so they don't have to create
custom validators and annotations whenever a new data structure is needed.
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