Adding the localized Display Name to the constraint violation message?

Question

We are using the new GWT validation library in 2.5.

We are adding an aggregated list of violations to our screen. This list must display the localized field name.

@MyNotNull(foo= "Stage")
public String getStage();

Localized message needs to display

"Stage is a required field"

The message in MyValidationMessages.properties reads

{foo} is a required field

Note that annotations do not allow non-constant values to be assigned to attributes. So we have to get the locale value somehow at design time :/

This will not work

@MyNotNull(foo = injector.getLocale().errorMessage()) 
public String errorMessage()

How do I use localeKey to look up the locale in the locale files since the property requires a constant?

Kenoyer130 Kenoyer130 · Accepted Answer · 2013-02-08T19:51:20

The solution is to

add something like FieldLocale.properties this is a constants lookup
Add an attribute to your annotation like localeKey
Iterate your ConstraintViolation collection
Use something like the below to get the attribute value
Look up the localized value in your FieldLocale.properties file

Copy the violation and change the message to the localized version

protected String getAttributeValue(ConstraintViolation violation, String key) { ConstraintDescriptor descriptor = violation.getConstraintDescriptor();

    if (descriptor.getAttributes().containsKey(key))
        return (String) descriptor.getAttributes().get(key);

    return null;
}

protected ConstraintViolation<T> copyMessage(ConstraintViolation<T> violation, String message) {
    return ConstraintViolationImpl.<T> builder() //
            .setConstraintDescriptor(violation.getConstraintDescriptor()) //
            .setInvalidValue(violation.getInvalidValue()) //
            .setLeafBean(violation.getLeafBean()) //
            .setMessage(message) //
            .setMessageTemplate(violation.getMessageTemplate()) //
            .setPropertyPath(violation.getPropertyPath()) //
            .setRootBean(violation.getRootBean()) //
            .setRootBeanClass(violation.getRootBeanClass()) //
            .build();
}

Adding the localized Display Name to the constraint violation message?

1 Answers