1 /* ==================================================================== 2 * Copyright (c) 2006 J.T. Beetstra 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining 5 * a copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sublicense, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be 13 * included in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22 * ==================================================================== 23 */ 24 25 package com.beetstra.jutf7; 26 27 /** 28 * <p> 29 * The character set specified in RFC 2152. Two variants are supported using the 30 * encodeOptional constructor flag 31 * </p> 32 * 33 * @see <a href="http://tools.ietf.org/html/rfc2152">RFC 2152< /a> 34 * @author Jaap Beetstra 35 */ 36 class UTF7Charset extends UTF7StyleCharset { 37 private static final String BASE64_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 38 + "abcdefghijklmnopqrstuvwxyz" + "0123456789+/"; 39 private static final String SET_D = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'(),-./:?"; 40 private static final String SET_O = "!\"#$%&*;<=>@[]^_`{|}"; 41 private static final String RULE_3 = " \t\r\n"; 42 final String directlyEncoded; 43 UTF7Charset(String name, String[] aliases, boolean includeOptional)44 UTF7Charset(String name, String[] aliases, boolean includeOptional) { 45 super(name, aliases, BASE64_ALPHABET, false); 46 if (includeOptional) 47 this.directlyEncoded = SET_D + SET_O + RULE_3; 48 else 49 this.directlyEncoded = SET_D + RULE_3; 50 } 51 52 /* 53 * (non-Javadoc) 54 * @see com.beetstra.jutf7.UTF7StyleCharset#canEncodeDirectly(char) 55 */ canEncodeDirectly(char ch)56 boolean canEncodeDirectly(char ch) { 57 return directlyEncoded.indexOf(ch) >= 0; 58 } 59 60 /* 61 * (non-Javadoc) 62 * @see com.beetstra.jutf7.UTF7StyleCharset#shift() 63 */ shift()64 byte shift() { 65 return '+'; 66 } 67 68 /* 69 * (non-Javadoc) 70 * @see com.beetstra.jutf7.UTF7StyleCharset#unshift() 71 */ unshift()72 byte unshift() { 73 return '-'; 74 } 75 } 76