business-logic-validation

Show more info about blv at http://www.finnetrolle.ru/business-logic-validation/

This library can help you organize code for validation process.

Installation

Just add to your pom.xml dependency

<dependency>
    <groupId>ru.finnetrolle</groupId>
    <artifactId>business-logic-validation</artifactId>
    <version>0.4.0</version>
</dependency>

Usage

You can see examples in test folder

Simple example

This is a simpliest validation example:

    ValidationResult result = ValidationResult.validate("James")
            .with("length > 3", name -> name.length() > 3);

We're trying to validate that name "James" has length > 3

Group validation

You can validate multiple times to get one big result. For example you have two lists - passport ids and names. You want one result with groups such 'passport validation' and 'name validation'. Let's make it:

VALIDATE
    passports BY GROUP 'passport validation' CONTAINS(
        length = 10,
        contains digit 6)
AND names BY GROUP 'name validation' CONTAINS(
        length > 2)

Simple? I think yes. Let's take a look at code

        ValidationResult result = ValidationResult
                .validate(PASSPORTS).by(RuleGroup.named("Passport Validation").validating(
                        SimpleRule.error("length = 10", p -> p.length() == 10),
                        SimpleRule.error("contains digit 6", p -> p.contains("6"))))
                .and(NAMES).by(RuleGroup.named("Name Validation").validating(
                        SimpleRule.error("Name length > 2", p -> p.length() > 2)))