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 import java.nio.charset.Charset; 28 import java.util.Arrays; 29 import java.util.Iterator; 30 import java.util.List; 31 32 /** 33 * <p> 34 * Charset service-provider class used for both variants of the UTF-7 charset 35 * and the modified-UTF-7 charset. 36 * </p> 37 * 38 * @author Jaap Beetstra 39 */ 40 public class CharsetProvider extends java.nio.charset.spi.CharsetProvider { 41 private static final String UTF7_NAME = "UTF-7"; 42 private static final String UTF7_O_NAME = "X-UTF-7-OPTIONAL"; 43 private static final String UTF7_M_NAME = "X-MODIFIED-UTF-7"; 44 private static final String[] UTF7_ALIASES = new String[] { 45 "UNICODE-1-1-UTF-7", "CSUNICODE11UTF7", "X-RFC2152", "X-RFC-2152" 46 }; 47 private static final String[] UTF7_O_ALIASES = new String[] { 48 "X-RFC2152-OPTIONAL", "X-RFC-2152-OPTIONAL" 49 }; 50 private static final String[] UTF7_M_ALIASES = new String[] { 51 "X-IMAP-MODIFIED-UTF-7", "X-IMAP4-MODIFIED-UTF7", "X-IMAP4-MODIFIED-UTF-7", 52 "X-RFC3501", "X-RFC-3501" 53 }; 54 private Charset utf7charset = new UTF7Charset(UTF7_NAME, UTF7_ALIASES, false); 55 private Charset utf7oCharset = new UTF7Charset(UTF7_O_NAME, UTF7_O_ALIASES, true); 56 private Charset imap4charset = new ModifiedUTF7Charset(UTF7_M_NAME, UTF7_M_ALIASES); 57 private List<Charset> charsets; 58 59 public CharsetProvider() { 60 charsets = Arrays.asList(new Charset[] { 61 utf7charset, imap4charset, utf7oCharset 62 }); 63 } 64 65 /** 66 * {@inheritDoc} 67 */ 68 @Override 69 public Charset charsetForName(String charsetName) { 70 charsetName = charsetName.toUpperCase(); 71 for (Iterator<Charset> iter = charsets.iterator(); iter.hasNext();) { 72 Charset charset = iter.next(); 73 if (charset.name().equals(charsetName)) 74 return charset; 75 } 76 for (Iterator<Charset> iter = charsets.iterator(); iter.hasNext();) { 77 Charset charset = iter.next(); 78 if (charset.aliases().contains(charsetName)) 79 return charset; 80 } 81 return null; 82 } 83 84 /** 85 * {@inheritDoc} 86 */ 87 @Override 88 public Iterator<Charset> charsets() { 89 return charsets.iterator(); 90 } 91 } 92
