How to avoid ModelLayer Update when validation fails in ValueChangeListener

Hi,
One of the requirement in my application is to avoid model layer update when a value is changed in a field and it is not a valid value according to business functionality. Scenario is explained below.
1. Screen has one field SSN no.
2. User enters 889787873 (According to functionality, SSN no. should not start with 8 or 9)
3. The moment user enters and does Tab out, Value change listener gets fired (AutoSubmit is set to true and value change listener is mapped to it)
4. I have a util method isValidSSN(int ssnNo) that gets the SSN no as input argument, validates it, returns true if it is valid otherwise false.
There can be many ways to achieve the above said functiontlity including the best way of keeping the validation at entity attribute level. But that is not what i am looking for. I am doing migration of desktop application and want to mimic the code as how as it is (According to client requirement).
Requirement behavior:
In value change listener, I should get the newly entered value (Not from ValueChangeEvent.getNewValue()), validate it. If it is valid, I should update the model. If not, I should not do model layer update call at all as i want to keep my transaction undirty, but show invalid SSN message to the user.
Requirement:
1. Get the new value inside valueChange listener. I don't want to use valueChangeEvent.getNewValue() because what i said as SSN is just an example but in our app, we use many data types including custom domain data types. So i cannot expect valuechangeEvent.getNewValue() always gives me the new value with proper data type. I also know i cannot use UiComponent.processUpdate(facesContext) to get the new value from VO attribute. Because calling processUpdate issues setAttribute call at model layer, which in turn makes the transaction dirty. So i need to access the newly entered value with proper data type in some other way.
2. If any itemChange logic fails, I should not update the model layer but directly comes to render response. I hope this is doable by calling FacesContext.renderResponse() API but need confirmation or any other way if i am wrong.
Thanks in Advance.
Raghu

Thanks to all for your responses. Regarding accessing of new value inside value change listener, I am sure ValueChangeEvent.getNewValue() is not going to give me the value with proper data type. I am not using immediate attribute anywhere but use custom domain data type with masking (i.e. Formatter Format). Also I use InputDate field. Always valueChangeEvent.getNewValue() gives me the string representation of the value but not with actual data type.
Question:
1. Is there any API, that gets the valueChangeEvent.getNewValue() and the UI components as parameters and return the data with proper data type?
2. I need to get the newly value with proper data type inside valueChangeListener. Is it achievable? If so, how?
Need your help.

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