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