JThrow is a library for exception throwing and logical validation, written in Java
JThrow is a great tool for exception and test driven development. The main purpose of the library is to encapsulate the inner state of your application, so-called Defensive Programming
import jthrow.JThrower;- Intuitive fluent API
String userEmail = "[email protected]";
JThrower.throwIf(userEmail)
.isNullOrEmpty()
.has(x -> x.length() < 5 || x.length() > 50)
.isInvalidEmail();
- Descriptive error messages
final int LEGAL_AGE = 18;
public static void buyBeer(int userAge) {
JThrower.throwIf(userAge, "Age").isLessThan(LEGAL_AGE);
System.out.println("Beer was sold");
}
public static void main(String[] args) {
buyBeer(21);
buyBeer(16);
}
Beer was sold
Exception in thread "main" custom.exceptions.OutOfRangeException: Age cannot be less than 18
at jthrow/models.ComparableValidationObject.isLessThan(ComparableValidationObject.java:29)
at jthrow/tests.Test.buyBeer(Test.java:21)
at jthrow/tests.Test.main(Test.java:17)
- All types that implement Comparable are supported
Date minDate = new Date(1890, 1, 1);
Date maxDate = new Date();
Date userBirthdate = new Date(1888, 6, 6);
JThrower.throwIf(userBirthdate)
.isNull()
.isOutOfRange(minDate, maxDate);
Exception in thread "main" custom.exceptions.OutOfRangeException:
Parameter was outside the range [Mon Feb 01 00:00:00 EET 3790, Sun Dec 06 00:54:16 EET 2020]
at jthrow/models.ComparableValidationObject.isOutOfRange(ComparableValidationObject.java:62)
at jthrow/tests.Test.main(Test.java:18)