package com.opencsv.bean.verifier;
   
   import com.opencsv.bean.BeanVerifier;
   import com.opencsv.bean.mocks.SingleNumber;
   import com.opencsv.exceptions.CsvConstraintViolationException;
   
   public class PositiveEvensOnly implements BeanVerifier<SingleNumber> {
       @Override
       public boolean verifyBean(SingleNumber bean) throws CsvConstraintViolationException {
          if(bean.getNumber() < 0) {
              throw new CsvConstraintViolationException("Negative number encountered.");
          }
          return bean.getNumber() % 2 == 0;
      }
  }