TextField Document model

[Mark Claassen]

JTextComponents (like JTextField) has a javax.swing.text.Document model
that made it pretty easy to create a text field that only allowed a certain
number of characters in it.  Similarly, it was also easy to make a Document
model that took all input, but forced characters to upper case.

@Override
public void insertString(int offs, String str, AttributeSet a) throws
BadLocationException {
     <Do stuff>
}

What is there going to be in JavaFX to accomplish the same goals?

Mark