Java String validation using enum values and annotation

Question

I want to validate a string against a set of values using annotations.

What I want is basically this:

@ValidateString(enumClass=com.co.enum)
String d         


        

Answer 1

I take up Rajeev Singla's response https://stackoverflow.com/a/21070806/8923905, just to optimize the code and allow the String parameter to be null, if in your application it is not mandatory and can be empty :

1- Remove the @NotNull annotation on the Interface

2- See the modified code below for the implementation.

public class EnumValidatorImpl implements ConstraintValidator  {

    private List valueList = null;

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        return null == value || valueList.contains(value.toUpperCase());
    }

    @Override
    public void initialize(EnumValidator constraintAnnotation) {
        valueList = new ArrayList<>();
        Class> enumClass = constraintAnnotation.enumClass();

        Enum[] enumValArr = enumClass.getEnumConstants();

        for(Enum enumVal : enumValArr) {
            valueList.add(enumVal.toString().toUpperCase());
        }

    }
}