InputException.java

package baseball;

import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;

public class InputException {
  private static final String NOT_NUMBER = "숫자가 아닙니다.";
  private static final String NOT_NUMBER_LENGTH = "숫자의 길이가 맞지 않습니다.";
  private static final String DUPLICATED = "중복된 숫자가 있습니다.";
  private static final String OUT_OF_RANGE = "숫자가 1~9 범위를 벗어났습니다.";
  private static final String NUMBER_REGEX = "^[0-9]*$";

  private InputException() {
  }

  public static void validatesNumber(String inputNumbers) {
    isNumber(inputNumbers);
    isLength(inputNumbers);
    isDuplicated(inputNumbers);
    isInRange(inputNumbers);
  }

  public static void isNumber(String inputNumbers) {
    if (!Pattern.matches(NUMBER_REGEX, inputNumbers)) {
      exception(NOT_NUMBER);
    }
  }

  public static void isLength(String inputNumbers) {
    if (inputNumbers.length() != 3) {
      exception(NOT_NUMBER_LENGTH);
    }
  }

  public static void isDuplicated(String inputNumbers) {
    List<String> inputNumberList = Arrays.asList(inputNumbers.split(""));
    if (inputNumberList.stream().distinct().count() < 3) {
      exception(DUPLICATED);
    }
  }

  public static void isInRange(String inputNumbers) {
    String[] inputNumberList = inputNumbers.split("");
    for (String num : inputNumberList) {
      int number = Integer.parseInt(num);
      if (number < 1 || number > 9) {
        exception(OUT_OF_RANGE);
      }
    }
  }

  private static void exception(String message) {
    throw new IllegalArgumentException(message);
  }
}