Android String End of Line Convert fold(String recipients)

Description

Builds a list of the recipients email addresses each on a different line, starting just from the second line with an HT ("\t") separator at the head of the line.

License

Open Source License

Parameter

Parameter	Description
recipients	A string containing all recipients comma-separated

Return

A string containing the email list of the recipients spread over more lines, ended by CRLF and beginning from the second with the WSP defined in the RFC 2822

Declaration

public static String fold(String recipients)

Method Source Code

/*//from   w  w  w.j  a  va  2s.  c  om
 * Funambol is a mobile platform developed by Funambol, Inc. 
 * Copyright (C) 2003 - 2007 Funambol, Inc.
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by
 * the Free Software Foundation with the addition of the following permission 
 * added to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED
 * WORK IN WHICH THE COPYRIGHT IS OWNED BY FUNAMBOL, FUNAMBOL DISCLAIMS THE 
 * WARRANTY OF NON INFRINGEMENT  OF THIRD PARTY RIGHTS.
 * 
 * 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 Affero General Public License 
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA.
 * 
 * You can contact Funambol, Inc. headquarters at 643 Bair Island Road, Suite 
 * 305, Redwood City, CA 94063, USA, or at email address info@funambol.com.
 * 
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 * 
 * In accordance with Section 7(b) of the GNU Affero General Public License
 * version 3, these Appropriate Legal Notices must retain the display of the
 * "Powered by Funambol" logo. If the display of the logo is not reasonably 
 * feasible for technical reasons, the Appropriate Legal Notices must display
 * the words "Powered by Funambol". 
 */

import java.util.Vector;

public class Main{
    private static final String HT = "\t";
    private static final String CRLF = "\r\n";
    /**
     * Builds a list of the recipients email addresses each on a different line,
     * starting just from the second line with an HT ("\t") separator at the
     * head of the line. This is an implementation of the 'folding' concept from
     * the RFC 2822 (par. 2.2.3)
     * 
     * @param recipients
     *            A string containing all recipients comma-separated
     * @return A string containing the email list of the recipients spread over
     *         more lines, ended by CRLF and beginning from the second with the
     *         WSP defined in the RFC 2822
     */
    public static String fold(String recipients) {
        String[] list = StringUtil.split(recipients, ",");

        StringBuffer buffer = new StringBuffer();

        for (int i = 0; i < list.length; i++) {
            String address = list[i] + (i != list.length - 1 ? "," : "");
            buffer.append(i == 0 ? address + CRLF : HT + address + CRLF);
        }

        return buffer.toString();
    }
    /**
     * Split the string into an array of strings using one of the separator
     * in 'sep'.
     *
     * @param s the string to tokenize
     * @param sep a list of separator to use
     *
     * @return the array of tokens (an array of size 1 with the original
     *         string if no separator found)
     */
    public static String[] split(String s, String sep) {
        // convert a String s to an Array, the elements
        // are delimited by sep
        Vector<Integer> tokenIndex = new Vector<Integer>(10);
        int len = s.length();
        int i;

        // Find all characters in string matching one of the separators in 'sep'
        for (i = 0; i < len; i++) {
            if (sep.indexOf(s.charAt(i)) != -1) {
                tokenIndex.addElement(new Integer(i));
            }
        }

        int size = tokenIndex.size();
        String[] elements = new String[size + 1];

        // No separators: return the string as the first element
        if (size == 0) {
            elements[0] = s;
        } else {
            // Init indexes
            int start = 0;
            int end = (tokenIndex.elementAt(0)).intValue();
            // Get the first token
            elements[0] = s.substring(start, end);

            // Get the mid tokens
            for (i = 1; i < size; i++) {
                // update indexes
                start = (tokenIndex.elementAt(i - 1)).intValue() + 1;
                end = (tokenIndex.elementAt(i)).intValue();
                elements[i] = s.substring(start, end);
            }
            // Get last token
            start = (tokenIndex.elementAt(i - 1)).intValue() + 1;
            elements[i] = (start < s.length()) ? s.substring(start) : "";
        }

        return elements;
    }
}