JSR-303 Bean Validation for enum fields

Question

I have a simple bean with enum field

public class TestBean{
   @Pattern(regexp = \"A|B\") //does not work
   private TestEnum testField;
   //getter         


        

Answer 1

I'd like to share my working solution:

@Documented
@Constraint(validatedBy = { EnumValueValidator.class })
@Retention(RetentionPolicy.RUNTIME)

@Target({ 
    ElementType.ANNOTATION_TYPE, 
    ElementType.CONSTRUCTOR,
    ElementType.FIELD, 
    ElementType.METHOD, 
    ElementType.PARAMETER 
})

public @interface EnumValue
{
    public abstract String                             message() default "{validation.enum.message}";

    public abstract Class[]                         groups()  default {};

    public abstract Class[]         payload() default {};

    public abstract Class> enumClass();
}

public class EnumValueValidator implements ConstraintValidator
{
    private Object[] enumValues;

    @Override
    public void initialize(final EnumValue annotation)
    {
        enumValues = annotation.enumClass().getEnumConstants();
    }

    @Override
    public boolean isValid(final Object value, final ConstraintValidatorContext context)
    {
        if (null != value) {
            String contextValue = value.toString();

            for (Object enumValue : enumValues) {
                if (enumValue.toString().equals(contextValue)) {
                    return true;
                }
            }
        }

        return false;
    }