accessing request parameters from inside validator - jboss

Question

Is there a proper way to access other form fields from inside a validator?
Is there another solution than:
context.getViewRoot().findComponent("formid:exampleField:example")?
f.e I want to validate a city field inside a custom validator and checking if country is US.

Answer 1

Re-read your question and I am going to interpret it as this:
"You would like to write a custom validator that checks that if a city field exists, the country field is equal to 'US'"
So, I would look at going about this in the following fashion:
First create a validator interface:
#Documented
#ValidatorClass(value=CountryEqualsUSValidator.class)
#Target(ElementType.TYPE)
#Retention(RetentionPolicy.RUNTIME)
public #interface CountryEqualsUS {
String message() default "The country should be US for the city provided";
}
Then create a validator class:
public class CountryEqualsUSValidator implements Validator<CountryEqualsUS> {
public void initialize(CountryEqualsUS arg0) {
}
public boolean isValid(Object value) {
if(value != null && value instanceof YourBeanClass) {
YourBeanClass yourBeanClass = (YourBeanClass) value;
if(/*some test logic here*/) {
return true;
else {
return false;
}
}
return false;
}
}
Then on the class that you want to validate:
#CountryEqualsUS
public class YourBeanClass {
...
}
Then, finally, on your controller/action class, when the form is submitted, the city is a value for which you want to check the country, add this method and call it:
public boolean doValidation(YourBeanClass yourBeanClass) {
ClassValidator requestValidator = new ClassValidator(yourBeanClass.getClass());
InvalidValue[] validationMessages = requestValidator.getInvalidValues(yourBeanClass);
if (validationMessages != null && validationMessages.length > 0) {
for (int i = 0; i < validationMessages.length; i++) {
//Add a validation message to be displayed to the user
}
return false;
}
return true;
}