Expert Spring MVC and Web Flow

Listing 9-2.Validator Implementation for Address Objects

package com.apress.expertspringmvc.validation;

import org.springframework.validation.Validator;

import org.springframework.validation.Errors;

import org.springframework.validation.ValidationUtils;

public class EasyAddressValidator implements Validator {

public boolean supports(Class clazz) {

Address.class.isAssignableFrom(clazz);

}

public void validate(Object target, Errors errors) {

ValidationUtils.rejectIfEmtpy(errors, "location", "addressLocationEmpty");

}

}

This Validatorrejects the location property on the Addressclass if the property value is

empty (nullor a zero-length string). addressLocationEmptyis the error code that’s looked up

through an org.springframework.context.MessageSourceinstance; by default this is the

ApplicationContext.

Let’s extend the Addressdomain class Validator. See Listing 9-3.

Listing 9-3.More Elaborate Validator for Address Objects

package com.apress.expertspringmvc.validation;

import org.springframework.validation.Validator;

import org.springframework.validation.Errors;

import org.springframework.validation.ValidationUtils;

public class AddressValidator implements Validator {

public boolean supports(Class clazz) {

return Address.class.isAssignableFrom(clazz);

}

public void validate(Object target, Errors errors) {

ValidationUtils.rejectIfEmpty(errors, "city", "cityEmpty");

ValidationUtils.rejectIfEmpty(errors, "location", "locationEmpty");

ValidationUtils.rejectIfEmpty(errors, "postalCode", "postalCodeEmpty");

ValidationUtils.rejectIfEmpty(errors, "country", "countryIsEmpty");

}

}

266 CHAPTER 9 ■VALIDATION