EndNumber.java

package baseball.domain;

import java.util.regex.Pattern;

public class EndNumber {
    public static final Integer END_LENGTH = 1;
    private final String REGEXP_PATTERN_FORMAT = String.format("[1-2]{%d}", END_LENGTH);
    private final Integer number;

    public EndNumber(String input) {
        validate(input);
        this.number = Integer.parseInt(input);
    }

    private void validate(String input) {
        isCorrectLength(input);
        isCorrectNumber(input);
    }

    private void isCorrectLength(String input) {
        if (input.length() != END_LENGTH) {
            throw new IllegalArgumentException("입력의 길이가 알맞지 않습니다.");
        }
    }

    private void isCorrectNumber(String input) {
        if (!Pattern.matches(REGEXP_PATTERN_FORMAT, input)) {
            throw new IllegalArgumentException("입력값이 형식을 만족하지 않습니다.");
        }
    }

    public boolean isEnd() {
        return this.number == 2;
    }
}