package com.gic.haoban.manage.web.utils;

public class EmojiFilterUtil {

    /**
    * 是否包含表情
    */

    private static boolean isEmojiCharacter(char codePoint) {
        return !((codePoint == 0x0) || (codePoint == 0x9) || (codePoint == 0xA) || (codePoint == 0xD)
                || ((codePoint >= 0x20) && (codePoint <= 0xD7FF)) || ((codePoint >= 0xE000) && (codePoint <= 0xFFFD))
                || ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF)));
    }

    public static String filterEmoji(String source) {
        StringBuilder buf = null;
        int len = source.length();

        for (int i = 0; i < len; i++) {
            char codePoint = source.charAt(i);
            if (!isEmojiCharacter(codePoint)) {// 如果不包含 则将字符append
                if (buf == null) {
                    buf = new StringBuilder(source.length());
                }
                buf.append(codePoint);
            } else {
            }
        }
        if (buf == null) {
            return source;// 如果没有找到 emoji表情，则返回源字符串
        } else {
            if (buf.length() == len) {// 这里的意义在于尽可能少的toString，因为会重新生成字符串
                buf = null;
                return source;
            } else {
                return buf.toString();
            }
        }

    }

}
