mirror of git://gcc.gnu.org/git/gcc.git
415 lines
11 KiB
Java
415 lines
11 KiB
Java
/* Charset.java --
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Copyright (C) 2002, 2004, 2005, 2007 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 java.nio.charset;
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import gnu.classpath.ServiceFactory;
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import gnu.classpath.SystemProperties;
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import gnu.java.nio.charset.Provider;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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import java.net.URL;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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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.Enumeration;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedHashSet;
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import java.util.Locale;
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import java.util.Set;
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import java.util.SortedMap;
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import java.util.TreeMap;
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/**
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* @author Jesse Rosenstock
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* @since 1.4
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* @status updated to 1.5
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*/
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public abstract class Charset implements Comparable<Charset>
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{
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private CharsetEncoder cachedEncoder;
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private CharsetDecoder cachedDecoder;
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/**
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* Extra Charset providers.
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*/
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private static CharsetProvider[] providers;
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private final String canonicalName;
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private final String[] aliases;
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protected Charset (String canonicalName, String[] aliases)
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{
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checkName (canonicalName);
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if (aliases != null)
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{
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int n = aliases.length;
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for (int i = 0; i < n; ++i)
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checkName (aliases[i]);
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}
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cachedEncoder = null;
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cachedDecoder = null;
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this.canonicalName = canonicalName;
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this.aliases = aliases;
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}
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/**
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* @throws IllegalCharsetNameException if the name is illegal
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*/
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private static void checkName (String name)
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{
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int n = name.length ();
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if (n == 0)
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throw new IllegalCharsetNameException (name);
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char ch = name.charAt (0);
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if (!(('A' <= ch && ch <= 'Z')
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|| ('a' <= ch && ch <= 'z')
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|| ('0' <= ch && ch <= '9')))
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throw new IllegalCharsetNameException (name);
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for (int i = 1; i < n; ++i)
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{
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ch = name.charAt (i);
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if (!(('A' <= ch && ch <= 'Z')
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|| ('a' <= ch && ch <= 'z')
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|| ('0' <= ch && ch <= '9')
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|| ch == '-' || ch == '.' || ch == ':' || ch == '_'))
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throw new IllegalCharsetNameException (name);
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}
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}
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/**
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* Returns the system default charset.
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*
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* This may be set by the user or VM with the file.encoding
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* property.
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*
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* @since 1.5
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*/
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public static Charset defaultCharset()
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{
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String encoding;
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try
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{
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encoding = SystemProperties.getProperty("file.encoding");
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}
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catch(SecurityException e)
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{
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// Use fallback.
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encoding = "ISO-8859-1";
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}
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catch(IllegalArgumentException e)
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{
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// Use fallback.
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encoding = "ISO-8859-1";
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}
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try
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{
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return forName(encoding);
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}
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catch(UnsupportedCharsetException e)
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{
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// Ignore.
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}
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catch(IllegalCharsetNameException e)
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{
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// Ignore.
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}
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catch(IllegalArgumentException e)
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{
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// Ignore.
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}
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throw new IllegalStateException("Can't get default charset!");
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}
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public static boolean isSupported (String charsetName)
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{
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return charsetForName (charsetName) != null;
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}
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/**
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* Returns the Charset instance for the charset of the given name.
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*
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* @param charsetName
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* @return the Charset instance for the indicated charset
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* @throws UnsupportedCharsetException if this VM does not support
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* the charset of the given name.
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* @throws IllegalCharsetNameException if the given charset name is
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* legal.
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* @throws IllegalArgumentException if <code>charsetName</code> is null.
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*/
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public static Charset forName (String charsetName)
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{
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// Throws IllegalArgumentException as the JDK does.
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if(charsetName == null)
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throw new IllegalArgumentException("Charset name must not be null.");
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Charset cs = charsetForName (charsetName);
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if (cs == null)
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throw new UnsupportedCharsetException (charsetName);
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return cs;
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}
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/**
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* Retrieves a charset for the given charset name.
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*
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* @return A charset object for the charset with the specified name, or
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* <code>null</code> if no such charset exists.
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*
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* @throws IllegalCharsetNameException if the name is illegal
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*/
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private static Charset charsetForName(String charsetName)
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{
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checkName (charsetName);
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// Try the default provider first
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// (so we don't need to load external providers unless really necessary)
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// if it is an exotic charset try loading the external providers.
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Charset cs = provider().charsetForName(charsetName);
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if (cs == null)
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{
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CharsetProvider[] providers = providers2();
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for (int i = 0; i < providers.length; i++)
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{
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cs = providers[i].charsetForName(charsetName);
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if (cs != null)
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break;
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}
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}
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return cs;
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}
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public static SortedMap<String, Charset> availableCharsets()
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{
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TreeMap<String, Charset> charsets
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= new TreeMap(String.CASE_INSENSITIVE_ORDER);
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for (Iterator<Charset> i = provider().charsets(); i.hasNext(); )
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{
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Charset cs = i.next();
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charsets.put(cs.name(), cs);
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}
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CharsetProvider[] providers = providers2();
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for (int j = 0; j < providers.length; j++)
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{
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for (Iterator<Charset> i = providers[j].charsets(); i.hasNext(); )
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{
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Charset cs = (Charset) i.next();
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charsets.put(cs.name(), cs);
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}
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}
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return Collections.unmodifiableSortedMap(charsets);
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}
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private static CharsetProvider provider()
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{
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try
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{
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String s = System.getProperty("charset.provider");
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if (s != null)
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{
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CharsetProvider p =
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(CharsetProvider) ((Class.forName(s)).newInstance());
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return p;
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}
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}
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catch (Exception e)
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{
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// Ignore.
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}
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return Provider.provider();
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}
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/**
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* We need to support multiple providers, reading them from
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* java.nio.charset.spi.CharsetProvider in the resource directory
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* META-INF/services. This returns the "extra" charset providers.
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*/
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private static CharsetProvider[] providers2()
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{
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if (providers == null)
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{
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try
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{
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Iterator i = ServiceFactory.lookupProviders(CharsetProvider.class);
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LinkedHashSet set = new LinkedHashSet();
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while (i.hasNext())
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set.add(i.next());
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providers = new CharsetProvider[set.size()];
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set.toArray(providers);
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}
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catch (Exception e)
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{
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throw new RuntimeException(e);
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}
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}
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return providers;
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}
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public final String name ()
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{
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return canonicalName;
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}
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public final Set<String> aliases ()
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{
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if (aliases == null)
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return Collections.<String>emptySet();
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// should we cache the aliasSet instead?
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int n = aliases.length;
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HashSet<String> aliasSet = new HashSet<String> (n);
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for (int i = 0; i < n; ++i)
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aliasSet.add (aliases[i]);
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return Collections.unmodifiableSet (aliasSet);
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}
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public String displayName ()
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{
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return canonicalName;
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}
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public String displayName (Locale locale)
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{
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return canonicalName;
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}
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public final boolean isRegistered ()
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{
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return (!canonicalName.startsWith ("x-")
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&& !canonicalName.startsWith ("X-"));
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}
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public abstract boolean contains (Charset cs);
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public abstract CharsetDecoder newDecoder ();
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public abstract CharsetEncoder newEncoder ();
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public boolean canEncode ()
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{
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return true;
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}
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// NB: This implementation serializes different threads calling
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// Charset.encode(), a potential performance problem. It might
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// be better to remove the cache, or use ThreadLocal to cache on
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// a per-thread basis.
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public final synchronized ByteBuffer encode (CharBuffer cb)
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{
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try
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{
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if (cachedEncoder == null)
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{
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cachedEncoder = newEncoder ()
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.onMalformedInput (CodingErrorAction.REPLACE)
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.onUnmappableCharacter (CodingErrorAction.REPLACE);
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} else
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cachedEncoder.reset();
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return cachedEncoder.encode (cb);
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}
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catch (CharacterCodingException e)
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{
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throw new AssertionError (e);
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}
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}
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public final ByteBuffer encode (String str)
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{
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return encode (CharBuffer.wrap (str));
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}
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// NB: This implementation serializes different threads calling
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// Charset.decode(), a potential performance problem. It might
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// be better to remove the cache, or use ThreadLocal to cache on
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// a per-thread basis.
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public final synchronized CharBuffer decode (ByteBuffer bb)
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{
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try
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{
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if (cachedDecoder == null)
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{
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cachedDecoder = newDecoder ()
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.onMalformedInput (CodingErrorAction.REPLACE)
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.onUnmappableCharacter (CodingErrorAction.REPLACE);
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} else
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cachedDecoder.reset();
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return cachedDecoder.decode (bb);
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}
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catch (CharacterCodingException e)
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{
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throw new AssertionError (e);
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}
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}
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public final int compareTo (Charset other)
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{
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return canonicalName.compareToIgnoreCase (other.canonicalName);
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}
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public final int hashCode ()
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{
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return canonicalName.hashCode ();
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}
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public final boolean equals (Object ob)
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{
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if (ob instanceof Charset)
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return canonicalName.equalsIgnoreCase (((Charset) ob).canonicalName);
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else
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return false;
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}
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public final String toString ()
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{
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return canonicalName;
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}
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}
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