/* ====================================================================
* Copyright (c) 2006 J.T. Beetstra
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* ====================================================================
*/
package com.beetstra.jutf7;
/**
* <p>
* The character set specified in RFC 2152. Two variants are supported using the
* encodeOptional constructor flag
* </p>
*
* @see <a href="http://tools.ietf.org/html/rfc2152">RFC 2152< /a>
* @author Jaap Beetstra
*/
class UTF7Charset extends UTF7StyleCharset {
private static final String BASE64_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz" + "0123456789+/";
private static final String SET_D = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'(),-./:?";
private static final String SET_O = "!\"#$%&*;<=>@[]^_`{|}";
private static final String RULE_3 = " \t\r\n";
final String directlyEncoded;
UTF7Charset(String name, String[] aliases, boolean includeOptional) {
super(name, aliases, BASE64_ALPHABET, false);
if (includeOptional)
this.directlyEncoded = SET_D + SET_O + RULE_3;
else
this.directlyEncoded = SET_D + RULE_3;
}
/*
* (non-Javadoc)
* @see com.beetstra.jutf7.UTF7StyleCharset#canEncodeDirectly(char)
*/
boolean canEncodeDirectly(char ch) {
return directlyEncoded.indexOf(ch) >= 0;
}
/*
* (non-Javadoc)
* @see com.beetstra.jutf7.UTF7StyleCharset#shift()
*/
byte shift() {
return '+';
}
/*
* (non-Javadoc)
* @see com.beetstra.jutf7.UTF7StyleCharset#unshift()
*/
byte unshift() {
return '-';
}
}