2005-02-07 Robert Schuster <thebohemian@gmx.net> * gnu/java/nio/charset/ISO_8859_1.java, gnu/java/nio/charset/US_ASCII.java, gnu/java/nio/charset/UTF_16.java, gnu/java/nio/charset/UTF_16_LE.java, gnu/java/nio/charset/UTF_16_BE.java, gnu/java/nio/charset/UTF_8.java: Fixed canonical names and aliases according to "http://www.iana.org/assignments/character-sets", "http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html" and "http://oss.software.ibm.com/cgi-bin/icu/convexp?s=ALL". * gnu/java/nio/charset/Provider.java: Made charset lookup case-insensitive which fixes bug #11740. From-SVN: r94711
155 lines
4.6 KiB
Java
155 lines
4.6 KiB
Java
/* 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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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private Provider ()
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{
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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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}
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public Iterator charsets ()
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{
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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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return (Charset) charsets.get(canonicalNames.get(charsetName.toLowerCase()));
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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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