Another option is:
<t:textfield t:id="textField" validate="prop:validators" />
@Inject Field textField;
@Inject FieldValidatorSource fieldValidatorSource;
public FieldValidator getValidators() {
StringBuilder validators = new StringBuilder("a,b,c");
if (required) {
validators.append(",required");
}
fieldValidatorSource.createValidators(textField, validators.toString());
}
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