https://github.com/cepr0/sb-constraint-validator-injection-demo

Demo of the custom ConstraintValidator as a Spring Bean
https://github.com/cepr0/sb-constraint-validator-injection-demo

bean constraint-validation injection spring spring-boot validation

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Demo of the custom ConstraintValidator as a Spring Bean

• Host: GitHub
• URL: https://github.com/cepr0/sb-constraint-validator-injection-demo
• Owner: Cepr0
• Created: 2021-01-10T21:57:02.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2021-01-10T21:57:19.000Z (over 5 years ago)
• Last Synced: 2025-12-26T11:51:49.382Z (5 months ago)
• Topics: bean, constraint-validation, injection, spring, spring-boot, validation
• Language: Java
• Homepage:
• Size: 2.93 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

          
## Demo of the custom ConstraintValidator as a Spring Bean

Spring Boot allows injecting Spring beans to a ConstraintValidator, for example:

```java

@Slf4j

public class CaseValidator implements ConstraintValidator {

    private final Predicate uppercasePredicate;

    private final Predicate lowercasePredicate;

    private CheckCase.CaseMode caseMode;

    @Autowired // not necessary annotation

    public CaseValidator(Predicate uppercasePredicate, Predicate lowercasePredicate) {

        this.uppercasePredicate = uppercasePredicate;

        this.lowercasePredicate = lowercasePredicate;

    }

    @Override

    public void initialize(CheckCase constraintAnnotation) {

        this.caseMode = constraintAnnotation.value();

    }

    @Override

    public boolean isValid(String value, ConstraintValidatorContext context) {

        if (value == null) return true;

        if (caseMode == CheckCase.CaseMode.UPPER) {

            log.info("[i] Checking uppercase for value: {}", value);

            return uppercasePredicate.test(value);

        } else {

            log.info("[i] Checking lowercase for value: {}", value);

            return lowercasePredicate.test(value);

        }

    }

}

```