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");
  }

}