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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/nio/charset/EncodingHelper.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/nio/charset/EncodingHelper.java | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/nio/charset/EncodingHelper.java b/gcc-4.4.3/libjava/classpath/gnu/java/nio/charset/EncodingHelper.java new file mode 100644 index 000000000..479b6e534 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/nio/charset/EncodingHelper.java @@ -0,0 +1,164 @@ +/* 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 final HashMap<String,String> canonicalNames; + + static { + canonicalNames = new HashMap<String,String>(); + 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() + { + 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."); + } + } + + /** + * Returns the default charset without throwing any exceptions. The default + * charset is UTF8. + * + * @return the default charset + */ + public static Charset getDefaultCharset() + { + return new UTF_8(); + } +} + + + |