public class Validate {

    public static final String ALL_FIELDS = "ALL";
    public static final String INCLUDE_FIELDS = "INCLUDE";
    public static final String EXCLUDE_FIELDS = "EXCLUDE";

    /**
     * 實體屬性非空校驗
     *
     * @param obj      實體
     * @param checkAll 校驗所有屬性
     */
    public static void validate(Object obj, String checkAll) {
        Field[] fields = obj.getClass().getDeclaredFields();
        List<String> keySet = Arrays.stream(fields).map(Field::getName).collect(Collectors.toList());
        if (ALL_FIELDS.equalsIgnoreCase(checkAll)) {
            validate(obj, keySet);
        }
    }

    /**
     * @param obj       實體
     * @param checkPart include or exclude
     * @param part      待校驗屬性
     */
    public static void validate(Object obj, String checkPart, Collection<String> part) {
        Field[] fields = obj.getClass().getDeclaredFields();
        if (INCLUDE_FIELDS.equalsIgnoreCase(checkPart)) {
            validate(obj, part);
        }
        if (EXCLUDE_FIELDS.equalsIgnoreCase(checkPart)) {
            List<String> check = Arrays.stream(fields).map(Field::getName).filter(f -> !part.contains(f)).collect(Collectors.toList());
            validate(obj, check);
        }
    }

    /**
     * @param map      校驗map
     * @param checkSet 待校驗key
     */
    public static void validate(Map<String, Object> map, Collection<String> checkSet) {
        List<String> notNull = new ArrayList<>();
        for (String check : checkSet) {
            for (String key : map.keySet()) {
                if (!check.equals(key)) {
                    continue;
                }
                String value = map.get(check) == null ? "" : String.valueOf(map.get(check));
                if (value == null || "".equals(value)) {
                    notNull.add(key);
                }
                break;
            }
        }
        List<String> notAppear = checkSet.stream().filter(k -> !map.containsKey(k)).collect(Collectors.toList());
        notNull.addAll(notAppear);
        if (!notNull.isEmpty()) {
            throw new RuntimeException("引數 " + notNull + " 不可為空！");
        }
    }

    private static void validate(Object obj, Collection<String> checkSet) {
        Field[] fields = obj.getClass().getDeclaredFields();
        List<String> notNull = new ArrayList<>();
        try {
            for (String check : checkSet) {
                for (Field field : fields) {
                    // 開啟私有屬性，否則只能獲取到共有屬性
                    field.setAccessible(true);
                    String name = field.getName();
                    if (!check.equals(name)) {
                        continue;
                    }
                    String value = field.get(obj) == null ? "" : String.valueOf(field.get(obj));
                    if (value == null || "".equals(value)) {
                        notNull.add(name);
                    }
                    break;
                }
            }
            if (!notNull.isEmpty()) {
                throw new RuntimeException("引數 " + notNull + " 不可為空！");
            }
        } catch (IllegalAccessException e) {
            throw new RuntimeException("校驗失敗，異常堆疊資訊：" + e);
        }
    }
}