Message Title

Lovro Pandžić created an issue

Issue Type:	New Feature
Assignee:	Unassigned
Created:	18/Jul/2017 01:37 AM
Priority:	Major
Reporter:	Lovro Pandžić

For simpler ConstraintValidators which ignore null cases and don't need to initialise constraintAnnotation there is a lot of boilerplate that could be simplified with a base class or interface with default methods:

 
                                                                public class FooValidator implements ConstraintValidator<Foo, Bar> {

    // boilerplate
    @Override
    public void initialize(Foo constraintAnnotation) {
    }

    @Override
    public boolean isValid(Bar value, ConstraintValidatorContext context) {

       // boilerplate
        if (value == null) {
            return true;
        }

        // validation logic
    }
}
 
                                                            

For this case it would be nice if there was something like:

 
                                                                @FunctionalInterface
public interface SimpleConstraintValidator<A extends Annotation, T> extends ConstraintValidator<A, T> {

    @Override
    default void initialize(A constraintAnnotation) {

    }

    @Override
    default boolean isValid(T value, ConstraintValidatorContext context) {

        if(value == null) {
            return true;
        }

        return isValid(value);
    }

    boolean isValid(T value);
}
 
                                                            

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