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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/nio/charset/Provider.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/nio/charset/Provider.java')
-rw-r--r-- | libjava/classpath/gnu/java/nio/charset/Provider.java | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/nio/charset/Provider.java b/libjava/classpath/gnu/java/nio/charset/Provider.java new file mode 100644 index 000000000..8fc42e5f6 --- /dev/null +++ b/libjava/classpath/gnu/java/nio/charset/Provider.java @@ -0,0 +1,271 @@ +/* Provider.java -- + Copyright (C) 2002, 2005, 2006 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.nio.charset.Charset; +import java.nio.charset.spi.CharsetProvider; +import java.security.AccessController; +import java.security.PrivilegedAction; +import java.util.Collections; +import java.util.HashMap; +import java.util.Iterator; + +/** + * Charset provider for the required charsets. Used by + * {@link Charset#charsetForName} and * {@link Charset#availableCharsets}. + * + * Note: This class is a privileged class, because it can be instantiated without + * requiring the RuntimePermission("charsetProvider"). There is a check in + * java.nio.charset.spi.CharsetProvider to skip the security check if the provider + * is an instance of this class. + * + * @author Jesse Rosenstock + * @author Robert Schuster (thebohemian@gmx.net) + * @see Charset + */ +public final class Provider extends CharsetProvider +{ + private static Provider singleton; + + /** + * Map from charset name to charset canonical name. The strings + * are all lower-case to allow case-insensitive retrieval of + * Charset instances. + */ + private final HashMap<String, String> canonicalNames; + + /** + * Map from lower-case canonical name to Charset. + * TODO: We may want to use soft references. We would then need to keep + * track of the class name to regenerate the object. + */ + private final HashMap<String, Charset> charsets; + + /** + * We don't load all available charsets at the start + */ + private boolean extendedLoaded; + + // Package private to avoid an accessor method in PrivilegedAction below. + Provider () + { + extendedLoaded = false; + canonicalNames = new HashMap<String,String> (); + charsets = new HashMap<String,Charset> (); + + // US-ASCII aka ISO646-US + addCharset (new US_ASCII ()); + + // ISO-8859-1 aka ISO-LATIN-1 + addCharset (new ISO_8859_1 ()); + + // UTF-8 + addCharset (new UTF_8 ()); + + // UTF-16BE + addCharset (new UTF_16BE ()); + + // UTF-16LE + addCharset (new UTF_16LE ()); + + // UTF-16 + addCharset (new UTF_16 ()); + + // UTF-16LE (marked) + addCharset (new UnicodeLittle ()); + + // Windows-1250 aka cp-1250 (East European) + addCharset (new Windows1250 ()); + + // Windows-1251 (Cyrillic) + addCharset (new Windows1251 ()); + + // Windows-1252 aka cp-1252 (Latin-1) + addCharset (new Windows1252 ()); + + // Windows-1253 (Greek) + addCharset (new Windows1253 ()); + + // Windows-1254 (Turkish) + addCharset (new Windows1254 ()); + + // Windows-1257 (Baltic) + addCharset (new Windows1257 ()); + + // ISO-8859-2 aka ISO-LATIN-2 + addCharset (new ISO_8859_2 ()); + + // ISO-8859-4 aka ISO-LATIN-4 + addCharset (new ISO_8859_4 ()); + + // ISO-8859-5 (Cyrillic) + addCharset (new ISO_8859_5 ()); + + // ISO-8859-7 (Greek) + addCharset (new ISO_8859_7 ()); + + // ISO-8859-9 aka ISO-LATIN-5 + addCharset (new ISO_8859_9 ()); + + // ISO-8859-13 aka ISO-LATIN-7 + addCharset (new ISO_8859_13 ()); + + // ISO-8859-15 aka ISO-LATIN-9 + addCharset (new ISO_8859_15 ()); + + // KOI8 (Cyrillic) + addCharset (new KOI_8 ()); + } + + /** + * Load non-mandatory charsets. + */ + private synchronized void loadExtended () + { + if (extendedLoaded) + return; + + addCharset (new ISO_8859_3 ()); // ISO-8859-3 aka ISO-LATIN-3 + addCharset (new ISO_8859_6 ()); // ISO-8859-6 (Arabic) + addCharset (new ISO_8859_8 ()); // ISO-8859-8 (Hebrew) + + // Some more codepages + addCharset (new Cp424()); + addCharset (new Cp437()); + addCharset (new Cp737()); + addCharset (new Cp775()); + addCharset (new Cp850()); + addCharset (new Cp852()); + addCharset (new Cp855()); // IBM Cyrillic + addCharset (new Cp857()); // IBM Turkish + addCharset (new Cp860()); // MSDOS Portugese + addCharset (new Cp861()); // MSDOS Icelandic + addCharset (new Cp862()); // PC Hebrew + addCharset (new Cp863()); // MSDOS Can. French + addCharset (new Cp864()); // PC Arabic + addCharset (new Cp865()); // MSDOS Nordic + addCharset (new Cp866()); // MSDOS Russian + addCharset (new Cp869()); // IBM modern Greek + addCharset (new Cp874()); // IBM Thai + + addCharset (new MacCentralEurope()); + addCharset (new MacCroatian()); + addCharset (new MacCyrillic()); + addCharset (new MacDingbat()); + addCharset (new MacGreek()); + addCharset (new MacIceland()); + addCharset (new MacRoman()); + addCharset (new MacRomania()); + addCharset (new MacSymbol()); + addCharset (new MacThai()); + addCharset (new MacTurkish()); + addCharset (new MS874()); + + addCharset (new Windows1255()); + addCharset (new Windows1256()); + addCharset (new Windows1258()); + + extendedLoaded = true; + } + + public Iterator<Charset> charsets () + { + loadExtended(); + return Collections.unmodifiableCollection (charsets.values ()) + .iterator (); + } + + /** + * Returns a Charset instance by converting the given + * name to lower-case, looking up the canonical charset + * name and finally looking up the Charset with that name. + * + * <p>The lookup is therefore case-insensitive.</p> + * + * @returns The Charset having <code>charsetName</code> + * as its alias or null if no such Charset exist. + */ + public Charset charsetForName (String charsetName) + { + Charset cs = (Charset) charsets.get(canonicalNames.get(charsetName.toLowerCase())); + if (cs == null) + { + loadExtended(); + cs = (Charset) charsets.get(canonicalNames.get(charsetName.toLowerCase())); + } + return cs; + } + + /** + * Puts a Charset under its canonical name into the 'charsets' map. + * Then puts a mapping from all its alias names to the canonical name. + * + * <p>All names are converted to lower-case</p>. + * + * @param cs + */ + private void addCharset (Charset cs) + { + String canonicalName = cs.name().toLowerCase(); + charsets.put (canonicalName, cs); + + /* Adds a mapping between the canonical name + * itself making a lookup using that name + * no special case. + */ + canonicalNames.put(canonicalName, canonicalName); + + for (Iterator<String> i = cs.aliases ().iterator (); i.hasNext (); ) + canonicalNames.put (((String) i.next()).toLowerCase(), canonicalName); + } + + public static synchronized Provider provider () + { + // The default provider is safe to instantiate. + if (singleton == null) + singleton = AccessController.doPrivileged + (new PrivilegedAction<Provider>() + { + public Provider run() + { + return new Provider(); + } + }); + return singleton; + } +} |