Initial revision
From-SVN: r102074
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Tom Tromey
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/* Provider.java --
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Copyright (C) 2002, 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.nio.charset.Charset;
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import java.nio.charset.spi.CharsetProvider;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Iterator;
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/**
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* Charset provider for the required charsets. Used by
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* {@link Charset#charsetForName} and * {@link Charset#availableCharsets}.
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*
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* @author Jesse Rosenstock
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* @author Robert Schuster (thebohemian@gmx.net)
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* @see Charset
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*/
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public final class Provider extends CharsetProvider
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{
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private static Provider singleton;
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static
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{
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synchronized (Provider.class)
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{
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singleton = null;
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}
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}
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/**
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* Map from charset name to charset canonical name. The strings
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* are all lower-case to allow case-insensitive retrieval of
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* Charset instances.
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*/
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private final HashMap canonicalNames;
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/**
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* Map from lower-case canonical name to Charset.
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* TODO: We may want to use soft references. We would then need to keep
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* track of the class name to regenerate the object.
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*/
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private final HashMap charsets;
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/**
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* We don't load all available charsets at the start
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*/
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private boolean extendedLoaded;
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private Provider ()
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{
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extendedLoaded = false;
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canonicalNames = new HashMap ();
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charsets = new HashMap ();
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// US-ASCII aka ISO646-US
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addCharset (new US_ASCII ());
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// ISO-8859-1 aka ISO-LATIN-1
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addCharset (new ISO_8859_1 ());
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// UTF-8
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addCharset (new UTF_8 ());
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// UTF-16BE
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addCharset (new UTF_16BE ());
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// UTF-16LE
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addCharset (new UTF_16LE ());
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// UTF-16
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addCharset (new UTF_16 ());
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// UTF-16LE (marked)
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addCharset (new UnicodeLittle ());
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// Windows-1250 aka cp-1250 (East European)
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addCharset (new Windows1250 ());
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// Windows-1251 (Cyrillic)
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addCharset (new Windows1251 ());
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// Windows-1252 aka cp-1252 (Latin-1)
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addCharset (new Windows1252 ());
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// Windows-1253 (Greek)
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addCharset (new Windows1253 ());
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// Windows-1254 (Turkish)
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addCharset (new Windows1254 ());
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// Windows-1257 (Baltic)
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addCharset (new Windows1257 ());
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// ISO-8859-2 aka ISO-LATIN-2
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addCharset (new ISO_8859_2 ());
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// ISO-8859-4 aka ISO-LATIN-4
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addCharset (new ISO_8859_4 ());
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// ISO-8859-5 (Cyrillic)
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addCharset (new ISO_8859_5 ());
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// ISO-8859-7 (Greek)
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addCharset (new ISO_8859_7 ());
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// ISO-8859-9 aka ISO-LATIN-5
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addCharset (new ISO_8859_9 ());
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// ISO-8859-13 aka ISO-LATIN-7
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addCharset (new ISO_8859_13 ());
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// ISO-8859-15 aka ISO-LATIN-9
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addCharset (new ISO_8859_15 ());
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// KOI8 (Cyrillic)
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addCharset (new KOI_8 ());
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}
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/**
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* Load non-mandatory charsets.
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*/
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private void loadExtended ()
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{
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if(extendedLoaded)
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return;
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addCharset (new ISO_8859_3 ()); // ISO-8859-3 aka ISO-LATIN-3
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addCharset (new ISO_8859_6 ()); // ISO-8859-6 (Arabic)
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addCharset (new ISO_8859_8 ()); // ISO-8859-8 (Hebrew)
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// Some more codepages
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addCharset (new Cp855()); // IBM Cyrillic
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addCharset (new Cp857()); // IBM Turkish
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addCharset (new Cp860()); // MSDOS Portugese
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addCharset (new Cp861()); // MSDOS Icelandic
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addCharset (new Cp862()); // PC Hebrew
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addCharset (new Cp863()); // MSDOS Can. French
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addCharset (new Cp864()); // PC Arabic
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addCharset (new Cp865()); // MSDOS Nordic
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addCharset (new Cp866()); // MSDOS Russian
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addCharset (new Cp869()); // IBM modern Greek
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addCharset (new Cp874()); // IBM Thai
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extendedLoaded = true;
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}
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public Iterator charsets ()
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{
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loadExtended();
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return Collections.unmodifiableCollection (charsets.values ())
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.iterator ();
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}
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/**
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* Returns a Charset instance by converting the given
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* name to lower-case, looking up the canonical charset
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* name and finally looking up the Charset with that name.
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*
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* <p>The lookup is therefore case-insensitive.</p>
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*
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* @returns The Charset having <code>charsetName</code>
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* as its alias or null if no such Charset exist.
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*/
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public Charset charsetForName (String charsetName)
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{
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Charset cs = (Charset) charsets.get(canonicalNames.get(charsetName.toLowerCase()));
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if(cs == null && !extendedLoaded)
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{
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loadExtended();
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cs = (Charset) charsets.get(canonicalNames.get(charsetName.toLowerCase()));
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}
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return cs;
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}
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/**
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* Puts a Charset under its canonical name into the 'charsets' map.
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* Then puts a mapping from all its alias names to the canonical name.
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*
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* <p>All names are converted to lower-case</p>.
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*
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* @param cs
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*/
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private void addCharset (Charset cs)
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{
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String canonicalName = cs.name().toLowerCase();
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charsets.put (canonicalName, cs);
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/* Adds a mapping between the canonical name
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* itself making a lookup using that name
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* no special case.
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*/
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canonicalNames.put(canonicalName, canonicalName);
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for (Iterator i = cs.aliases ().iterator (); i.hasNext (); )
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canonicalNames.put (((String) i.next()).toLowerCase(), canonicalName);
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}
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public static synchronized Provider provider ()
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{
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if (singleton == null)
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singleton = new Provider ();
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return singleton;
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}
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}
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