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

Since for some reasons enumerations are not supported this restriction could be simply handled by a simple String based Validator.

Validator:

/**
 * Validates a given object's String representation to match one of the provided
 * values.
 */
public class ValueValidator implements ConstraintValidator
{
    /**
     * String array of possible enum values
     */
    private String[] values;

    @Override
    public void initialize(final Value constraintAnnotation)
    {
        this.values = constraintAnnotation.values();
    }

    @Override
    public boolean isValid(final Object value, final ConstraintValidatorContext context)
    {
        return ArrayUtils.contains(this.values, value == null ? null : value.toString());
    }
}

Interface:

@Target(value =
{
    ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER
})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy =
{
    ValueValidator.class
})
@Documented
public @interface Value
{
    public String message() default "{package.Value.message}";

    Class[] groups() default
    {};

    Class[] payload() default
    {};

    public String[] values() default
    {};
}

Validator uses apache commons library. An advanced coerce to type method would enhance the flexibility of this validator even further.

An alternative could use a single String attribute instead of an array and split by delimiter. This would also print values nicely for error-message since arrays are not being printed, but handling null values could be a problem using String.valueOf(...)