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package com.datastax.util.lang;

/**
 * User: Anders Hong
 * Date: 9/18/13
 * Time: 12:31 PM
 */
public class EncodingUtil {
    /**
     * 中文转-->unicode
     *
     * @param str
     * @return 反回unicode编码
     */
    public static String chinaToUnicode(String str) {
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < str.length(); i++) {
            int chr1 = (char) str.charAt(i);
            result.append("\\u" + Integer.toHexString(chr1));

        }
        return result.toString();
    }

    /**
     * 把unicode转化为中文
     *
     * @param str
     * @return
     */
    public static String unicodeToChinese(String str) {
        if (containsChinese(str))//判断是否有中文字符
            return str;
        if (str.indexOf("\\u") == -1 || str == null || "".equals(str.trim())) {/*若不是unicode，则直接返回*/
            return str.replaceAll("\\\\ ", " ");//删掉英文中的\,such as "default\ value1"
            /* 主要是针对 zk 中的国际化问题 */
        }
        StringBuffer sb = new StringBuffer();
        if (!str.startsWith("\\u")) {/*若开头不是unicode，如“abc\u4e2d\u56fd” */
            int index = str.indexOf("\\u");
            sb.append(str.substring(0, index));
            str = str.substring(index);
        }
        if (str.endsWith(":")) /*如“\u4e2d\u56fd：” */ {
            str = str.substring(0, str.length() - 1);
        }
        String[] chs = str.trim().split("\\\\u");

        for (int i = 0; i < chs.length; i++) {
            String ch = chs[i].trim();
            if (ch != null && !"".equals(ch)) {

                sb.append((char) Integer.parseInt(ch.substring(0, 4), 16));
                if (ch.length() > 4) {
                    sb.append(ch.substring(4));
                }
            }
        }
        return sb.toString();
    }

    public static boolean isAllChinese(String text) {
        char[] charArray = text.toCharArray();
        for (int i = 0; i < charArray.length; i++) {
            if ((charArray[i] >= 0x4e00) && (charArray[i] <= 0x9fbb)) {
                //return true;
            }else {
                return false;
            }
        }
        return true;
    }

    public static boolean containsChinese(String word) {
        char[] input = word.trim().toCharArray();
        for (int i = 0; i < input.length; i++) {
            if (Character.toString(input[i]).matches("[\u4E00-\u9FA5]+")) {
                return true;
            }
        }
        return false;
    }

    public static String resolveUnicode(String oldValue, boolean isToUnicode) {
        if (isToUnicode) {
            return chinaToUnicode(oldValue);
        } else {
            return unicodeToChinese(new String(oldValue));
        }
    }


}