/** Validate the typed username */
private Member validateTo(final MobileActionContext context) {
final MobileDoPaymentForm form = context.getForm();
final String username = form.getUsername();
if (StringUtils.isEmpty(username)) {
throw new MobileException("errors.required", context.message("mobile.payment.username"));
}
User user;
try {
user = elementService.loadUser(username, User.Relationships.ELEMENT);
if (!(user instanceof MemberUser) || context.getUser().equals(user)) {
throw new Exception();
}
} catch (final Exception e) {
throw new MobileException("errors.invalid", context.message("mobile.payment.username"));
}
return (Member) user.getElement();
}
