Java Community | Help. Code. Learn.•7mo ago

Would this Validation System work?

I have this validation system I wanted to implement for absolutely no reason what so ever other than waste my time but essentially it just validates objects that are going to be created. Say you are creating an class called Tenant and this tenant is using the builder pattern. before the Tenant object is created it would validate it which would look something like this:

 // TODO Check this Method for Validity (Refactor if Necessary)
        private void isValidTenantBuild() {
            Validator<TenantBuilder> validator = Validator.of(this);

            // FIXME Add More Rules for Tenant If Necessary
            var tenantValid = validator
                    .addRule(t -> t.id != null, "Tenant ID is Required.")
                    .addRule(t -> t.name != null, "Tenant Name is Required.")
                    .addRule(t -> t.email != null, "Tenant Email is Required.")
                    .addRule(t -> t.phone != null, "Tenant Phone is Required.")
                    .addRule(t -> t.address != null, "Tenant Address is Required.")
                    .addRule(t -> t.lease != null, "Tenant Lease is Required.")
                    .getErrors();
        }

 // TODO Check this Method for Validity (Refactor if Necessary)
        private void isValidTenantBuild() {
            Validator<TenantBuilder> validator = Validator.of(this);

            // FIXME Add More Rules for Tenant If Necessary
            var tenantValid = validator
                    .addRule(t -> t.id != null, "Tenant ID is Required.")
                    .addRule(t -> t.name != null, "Tenant Name is Required.")
                    .addRule(t -> t.email != null, "Tenant Email is Required.")
                    .addRule(t -> t.phone != null, "Tenant Phone is Required.")
                    .addRule(t -> t.address != null, "Tenant Address is Required.")
                    .addRule(t -> t.lease != null, "Tenant Lease is Required.")
                    .getErrors();
        }

for the cove above its just a simple example of what you can do but it should work with different datatypes (primitive or reference) with their own set of rules.

7 Replies

JavaBot•7mo ago

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verboseOP•7mo ago

here is the validator class

Validator.txt

verboseOP•7mo ago

and the validate interface:

public interface Validate<T> {
    Validator<T> addRule(Predicate<? super T> rule, String message);
    <U> Validator<T> addRule(Function<? super T, ? extends U> mapper, Predicate<? super U> rule, String message);
    Validator<T> addRule(Predicate<? super T> rule);
    Validator<T> addRegexRule(String regex, String message);
    <U> Validator<T> addRegexRule(Function<? super T, ? extends U> mapper, String regex, String message);
}

public interface Validate<T> {
    Validator<T> addRule(Predicate<? super T> rule, String message);
    <U> Validator<T> addRule(Function<? super T, ? extends U> mapper, Predicate<? super U> rule, String message);
    Validator<T> addRule(Predicate<? super T> rule);
    Validator<T> addRegexRule(String regex, String message);
    <U> Validator<T> addRegexRule(Function<? super T, ? extends U> mapper, String regex, String message);
}

Unknown User•7mo ago

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verboseOP•7mo ago

yeah you're right it would be pretty whack now that I look at it, but I can see this being much better actually this code was references from another repository on github but it had the same construct you are talking about with Rule interface ill try this thanks!

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Would this Validation System work?