Builder example, part 8, the ValidatorBuilder

gistfile1.txt

  public class ValidatorBuilder {
    private Validator v;

    public ValidatorBuilder() {
      v = new Validator();
    }
    
    public Validator build() {
      return v;
    }
    
    public Validator buildAndValidate() {
      v.validate();
      return v;
    }

    public ValidatorBuilder withBlankFieldValidation(String... args) {
      ValidationRule blankFieldRule = new ValidationRule() {
        @Override
        public String getErrorMessage() {
          return "Required field is missing, null, or blank.";
        }

        @Override
        public boolean validate(String arg) {
          return (arg != null && !arg.isEmpty());
        }
      };
      v.addValidationRule(blankFieldRule, args);
      return this;
    }

    public ValidatorBuilder withEmailValidation(String... args) {
      ValidationRule emailRule = new ValidationRule() {
        @Override
        public String getErrorMessage() {
          return "Invalid email address. Please supply an email in the correct format.";
        }

        @Override
        public boolean validate(String arg) {
          return EmailValidator.getInstance().isValid(arg);
        }
      };
      v.addValidationRule(emailRule, args);
      return this;
    }

    public ValidatorBuilder withBirthDateValidation(String... args) {
      ValidationRule birthDateRule = new ValidationRule() {
        @Override
        public String getErrorMessage() {
          return "Invalid birthday. Birthday must be in the format YYYY-MM-DD and in the past.";
        }

        @Override
        public boolean validate(String arg) {
          final String DATE_FORMAT = "yyyy-MM-dd";
          final SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT, Locale.FRANCE);
          try {
            Date now = new Date();
            Date birthday = sdf.parse(arg);
            if(birthday.after(now)) {
              return false;
            }
          }
          catch (ParseException e) {
            return false;
          }
          return true;
        }
      };
      v.addValidationRule(birthDateRule, args);
      return this;
    }
  }