| /* EncodingHelper.java -- Useful character encoding methods. |
| Copyright (C) 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.nio.charset; |
| |
| import java.util.HashMap; |
| import java.nio.charset.IllegalCharsetNameException; |
| import java.nio.charset.UnsupportedCharsetException; |
| import java.nio.charset.Charset; |
| import java.io.UnsupportedEncodingException; |
| |
| /** |
| * This class provides some useful utility methods |
| * for charset encoding for the java.lang and java.io methods. |
| * |
| * @author Sven de Marothy |
| */ |
| public class EncodingHelper |
| { |
| |
| /** |
| * Contains the mapping from java.io canonical names |
| * to java.nio canonical names. |
| */ |
| private static HashMap canonicalNames; |
| |
| static { |
| canonicalNames = new HashMap(); |
| canonicalNames.put("US-ASCII", "ASCII"); |
| canonicalNames.put("windows-1250", "Cp1250"); |
| canonicalNames.put("windows-1251", "Cp1251"); |
| canonicalNames.put("windows-1252", "Cp1252"); |
| canonicalNames.put("windows-1253", "Cp1253"); |
| canonicalNames.put("windows-1254", "Cp1254"); |
| canonicalNames.put("windows-1257", "Cp1257"); |
| canonicalNames.put("ISO-8859-1", "ISO8859_1"); |
| canonicalNames.put("ISO-8859-2", "ISO8859_2"); |
| canonicalNames.put("ISO-8859-4", "ISO8859_4"); |
| canonicalNames.put("ISO-8859-5", "ISO8859_5"); |
| canonicalNames.put("ISO-8859-7", "ISO8859_7"); |
| canonicalNames.put("ISO-8859-9", "ISO8859_9"); |
| canonicalNames.put("ISO-8859-13", "ISO8859_13"); |
| canonicalNames.put("ISO-8859-15", "ISO8859_15"); |
| canonicalNames.put("KOI8-R", "KOI8_R"); |
| canonicalNames.put("UTF-8", "UTF8"); |
| canonicalNames.put("UTF-16BE", "UnicodeBigUnmarked"); |
| canonicalNames.put("UTF-16LE", "UnicodeLittleUnmarked"); |
| canonicalNames.put("windows-1255", "Cp1255"); |
| canonicalNames.put("windows-1256", "Cp1256"); |
| canonicalNames.put("windows-1258", "Cp1258"); |
| canonicalNames.put("ISO-8859-3", "ISO8859_3"); |
| canonicalNames.put("ISO-8859-6", "ISO8859_6"); |
| canonicalNames.put("ISO-8859-8", "ISO8859_8"); |
| } |
| |
| /** |
| * Returns the name of the default encoding, |
| * falls back on defaults to Latin-1 if there's a problem. |
| */ |
| public static String getDefaultEncoding() |
| { |
| String encoding; |
| try |
| { |
| return System.getProperty("file.encoding"); |
| } catch(SecurityException e) { |
| } catch(IllegalArgumentException e) { |
| } |
| // XXX - Throw an error here? For now, default to the 'safe' encoding. |
| return "8859_1"; |
| } |
| |
| /** |
| * Returns the java.io canonical name of a charset given with the |
| * java.nio canonical name. If the charset does not have a java.io |
| * canonical name, the input string is returned. |
| */ |
| public static String getOldCanonical(String newCanonical) |
| { |
| String oldCanonical = (String) canonicalNames.get(newCanonical); |
| return (oldCanonical != null)?oldCanonical : newCanonical; |
| } |
| |
| public static boolean isISOLatin1(String s) |
| { |
| if(s.equals("ISO-8859-1") || |
| s.equals("8859_1") || |
| s.equals("ISO_8859-1") || |
| s.equals("latin1") || |
| s.equals("ISO8859_1") || |
| s.equals("ISO_8859_1")) |
| return true; |
| return false; |
| } |
| |
| /** |
| * Gets a charset, throwing the java.io exception and not |
| * the java.nio exception if an error occurs. |
| */ |
| public static Charset getCharset(String name) |
| throws UnsupportedEncodingException |
| { |
| try |
| { |
| return Charset.forName(name); |
| } |
| catch(IllegalCharsetNameException e) |
| { |
| throw new UnsupportedEncodingException("Charset "+name+" not found."); |
| } |
| catch(UnsupportedCharsetException e) |
| { |
| throw new UnsupportedEncodingException("Charset "+name+" not found."); |
| } |
| } |
| } |
| |
| |
| |