Java Encode encodeGoomojiSubject(String subject)

Description

encode Goomoji Subject

License

Open Source License

Declaration

public static String encodeGoomojiSubject(String subject) throws UnsupportedEncodingException 

Method Source Code

//package com.java2s;
/*//from w  w  w  .j  a  v  a 2  s  .  co m
 * imoten - i mode.net mail tensou(forward)
 *
 * Copyright (C) 2010 shoozhoo (http://code.google.com/p/imoten/)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */

import java.io.UnsupportedEncodingException;

import javax.mail.internet.MimeUtility;

public class Main {
    public static String encodeGoomojiSubject(String subject) throws UnsupportedEncodingException {
        final int maxlen = 75 - ("=?UTF-8?B?".length() + "?=".length());
        StringBuilder sb = new StringBuilder();

        int mark = 0;
        int utf8len = "X-Goomoji-Subject: ".length();
        for (int i = 0; i < subject.length();) {
            int cp = subject.codePointAt(i);
            int len;
            if (cp < 0x7f)
                len = 1;
            else if (cp <= 0x7ff)
                len = 2;
            else if (cp <= 0xffff)
                len = 3;
            else
                len = 4;

            if (4 * ((utf8len + len - 1) / 3 + 1) >= maxlen) {
                if (mark > 0)
                    sb.append("\r\n ");
                sb.append(MimeUtility.encodeWord(subject.substring(mark, i), "UTF-8", "B"));
                mark = i;
                utf8len = 0;
            }

            utf8len += len;
            i += Character.charCount(cp);
        }
        if (mark > 0)
            sb.append("\r\n ");
        sb.append(MimeUtility.encodeWord(subject.substring(mark), "UTF-8", "B"));

        return sb.toString();
    }
}

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