Use concrete Class Methods to check validations

Please use the concrete Class Methods to check validations. Its realy unexpected that Validator don't use the normal Object way and invoke the conrete object with another class.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | no
| Fixed tickets | 
| License       | MIT
| Doc PR        |