import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.AccessLevel;
import lombok.AllArgsConstructor;
import lombok.NonNull;
import lombok.Value;

/**
 * For "single-value" data types, Jackson and Spring MVC automatically look for instance or static "string" constructors.
 * <p>
 * We use @JsonCreator and a custom static ctor to add validation or any parsing logic to String
 */
@Value
@AllArgsConstructor(access = AccessLevel.PRIVATE) // mark instance ctor private, only static ctor may use it
public final class ImmutableStringElement {
    @NonNull
    String elementName;

    /**
     * any instantiation (code, Jackson & Spring MVC) will go through this static ctor - put validation logic here
     */
    @JsonCreator
    public static ImmutableStringElement of(@JsonProperty("elementName") @NonNull String elementName) {
        // put validation logic here
        if (elementName.length() < 5) throw new IllegalArgumentException("name length must be >5");
        return new ImmutableStringElement(elementName);
    }
}