Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package th.co.geniustree.dental.angular.validator; import com.google.common.base.Strings; import javax.validation.ConstraintValidator; import javax.validation.ConstraintValidatorContext; import org.springframework.beans.factory.annotation.Autowired; import th.co.geniustree.dental.angular.model.Customer; import th.co.geniustree.dental.angular.repo.CustomerRepo; /** * * @author oom */ public class NameUniqueValidator implements ConstraintValidator<NameUnique, String> { @Autowired private CustomerRepo customerRepo; @Override public void initialize(NameUnique constraintAnnotation) { } @Override public boolean isValid(String value, ConstraintValidatorContext context) { if (Strings.isNullOrEmpty(value)) { return true; } Customer findByNameIgnoreCase = customerRepo.findByNameIgnoreCase(value); return findByNameIgnoreCase == null; } }