Java Fluent Validator
Validating data is a common task that occurs throughout any application, especially the business logic layer. As for some quite complex scenarios, often the same or similar validations are scattered everywhere, thus it is hard to reuse code and break the DRY rule.
Compatible JDK 8, 11, 15, 16 and 17
This library supports Kotlin aswell
Sample
Java
import static br.com.fluentvalidator.predicate.ComparablePredicate.equalTo;
import static br.com.fluentvalidator.predicate.LogicalPredicate.not;
import static br.com.fluentvalidator.predicate.ObjectPredicate.nullValue;
import static br.com.fluentvalidator.predicate.StringPredicate.stringContains;
import static br.com.fluentvalidator.predicate.StringPredicate.stringEmptyOrNull;
import br.com.fluentvalidator.model.Boy
import br.com.fluentvalidator.model.Gender;
import br.com.fluentvalidator.AbstractValidator;
public class JavaValidatorBoy extends AbstractValidator<Boy> {
@Override
protected void rules() {
ruleFor(Boy::getGender)
.must(equalTo(Gender.MALE))
.when(not(nullValue()))
.withMessage("gender of boy must be MALE")
.withFieldName("gender")
.critical();
ruleFor(Boy::getName)
.must(stringContains("John"))
.when(not(stringEmptyOrNull()))
.withMessage("child name must contains key John")
.withFieldName("name");
}
}Kotlin
import br.com.fluentvalidator.predicate.ComparablePredicate.equalTo;
import br.com.fluentvalidator.predicate.LogicalPredicate.not;
import br.com.fluentvalidator.predicate.ObjectPredicate.nullValue;
import br.com.fluentvalidator.predicate.StringPredicate.stringContains;
import br.com.fluentvalidator.predicate.StringPredicate.stringEmptyOrNull;
import br.com.fluentvalidator.model.Boy
import br.com.fluentvalidator.model.Gender;
import br.com.fluentvalidator.AbstractValidator;
class KotlinValidatorBoy : AbstractValidator<Boy> {
constructor() : super();
override fun rules() {
ruleFor(Boy::getGender)
.must(equalTo(Gender.MALE))
.`when`(not(nullValue()))
.withMessage("gender of boy must be MALE")
.withFieldName("gender")
.critical();
ruleFor(Boy::getName)
.must(stringContains("John"))
.`when`(not(stringEmptyOrNull()))
.withMessage("child name must contains key John")
.withFieldName("name");
}
}Index
Contributing
Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.
Versioning
We use GitHub for versioning. For the versions available, see the tags on this repository.
Authors
- Marcos Vallim - Founder, Author, Development, Test, Documentation - mvallim
- Paulo Sergio - Manteiner, Development, Test, Documentation - paulosergio-jnr
See also the list of contributors who participated in this project.
License
This project is licensed under the Apache License - see the LICENSE file for details