user1692342 :
I have a class with variables I don't want it to be null or empty. Is there a way to use Lombok builder to set the property? I can use @NonNull but I won't be able to verify if it is empty or not. Obviously the other option is to write my own builder which does all these checks. For example:
class Person {
@NonNull
private String firstName;
@NonNull
private String lastName;
public static class PersonBuilder() {
// .
// .
// .
public Person build() {
//do checks for empty etc and return object
}
}
}
Kedar Prabhu :
Maxim Kirilov's answer is incomplete. It doesn't check for blank/empty Strings.
I've faced the same issue before, and I realized that in addition to using @NonNull and @Builder from Lombok, overload the constructor with a private access modifier, where you can perform the validations. Something like this:
private Person(final String firstName, final String lastName) {
if(StringUtils.isBlank(firstName)) {
throw new IllegalArgumentException("First name can't be blank/empty/null");
}
if(StringUtils.isBlank(lastName)) {
throw new IllegalArgumentException("Last name can't be blank/empty/null");
}
this.firstName = firstName;
this.lastName = lastName;
}
Also, throwing IllegalArgumentException makes more sense (instead of NPE) when String has blank, empty or null values.
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