Create the validator class by extending the generic ValidatorBase<T> class.
class UserValidator extends ValidatorBase<User> {
}
Java
User user = new User();
UserValidator validator = new UserValidator(user);
validator.forProperty(User::getName)
.length(4)
.mustBe(n -> n.startsWith("J"))
.notEqual("John")
.onError()
.errorMessage("Name should start with J, be 4 characters in length and not be John");
ValidationResult result = validator.validate();
if (result.isValid()) {
// woohooo
} else {
for(ValidationError err : result.getValidationErrors()) {
System.out.print(err.toString());
}
}
Kotlin has even nicer syntax
val user = User()
val validator = UserValidator(user)
validator.forProperty { p -> p.name } rules {
length(4)
mustBe { n -> n.startsWith("J") }
notEqual("John")
} onError {
errorMessage("Name should start with J, be 4 characters in length and not be John")
}
val result = validator.validate()
If you don't want to create a validator class, add InnerValidator inside the validated class
class User(private val name: String, private val age: Int) {
val validator = InnerValidator(this) setRules {
forProperty { p -> p.name } rules {
equal("John")
}
}
}
Contributions are always welcome, just fork the project and submit a pull request.
Written by Marko Devcic
License APL 2.0