This is to be done at the UI component level, not at the renderer level. Your custom input component must surely already extend UIInput otherwise you've many other (future) problems and/or you'll waste time in writing repeated code. If your custom input component extends UIInput then you can just add the Validator by the inherited UIInput#addValidator() method in for example the component's constructor.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.