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-/* Provider.java --
- Copyright (C) 2002, 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.nio.charset.Charset;
-import java.nio.charset.spi.CharsetProvider;
-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}.
- *
- * @author Jesse Rosenstock
- * @author Robert Schuster (thebohemian@gmx.net)
- * @see Charset
- */
-public final class Provider extends CharsetProvider
-{
- private static Provider singleton;
-
- static
- {
- synchronized (Provider.class)
- {
- singleton = null;
- }
- }
-
- /**
- * 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 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 charsets;
-
- private Provider ()
- {
- canonicalNames = new HashMap ();
- charsets = new HashMap ();
-
- // 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 ());
- }
-
- public Iterator charsets ()
- {
- 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)
- {
- return (Charset) charsets.get(canonicalNames.get(charsetName.toLowerCase()));
- }
-
- /**
- * 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 i = cs.aliases ().iterator (); i.hasNext (); )
- canonicalNames.put (((String) i.next()).toLowerCase(), canonicalName);
- }
-
- public static synchronized Provider provider ()
- {
- if (singleton == null)
- singleton = new Provider ();
- return singleton;
- }
-}