From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/java/nio/charset/Charset.java | 414 ++++++++++++++++++++++++++++++++++ 1 file changed, 414 insertions(+) create mode 100644 libjava/java/nio/charset/Charset.java (limited to 'libjava/java/nio/charset/Charset.java') diff --git a/libjava/java/nio/charset/Charset.java b/libjava/java/nio/charset/Charset.java new file mode 100644 index 000000000..04b381948 --- /dev/null +++ b/libjava/java/nio/charset/Charset.java @@ -0,0 +1,414 @@ +/* Charset.java -- + Copyright (C) 2002, 2004, 2005, 2007 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 java.nio.charset; + +import gnu.classpath.ServiceFactory; +import gnu.classpath.SystemProperties; +import gnu.java.nio.charset.Provider; + +import java.io.BufferedReader; +import java.io.InputStreamReader; +import java.net.URL; +import java.nio.ByteBuffer; +import java.nio.CharBuffer; +import java.nio.charset.spi.CharsetProvider; +import java.util.Collections; +import java.util.Enumeration; +import java.util.HashSet; +import java.util.Iterator; +import java.util.LinkedHashSet; +import java.util.Locale; +import java.util.Set; +import java.util.SortedMap; +import java.util.TreeMap; + +/** + * @author Jesse Rosenstock + * @since 1.4 + * @status updated to 1.5 + */ +public abstract class Charset implements Comparable +{ + private CharsetEncoder cachedEncoder; + private CharsetDecoder cachedDecoder; + + /** + * Extra Charset providers. + */ + private static CharsetProvider[] providers; + + private final String canonicalName; + private final String[] aliases; + + protected Charset (String canonicalName, String[] aliases) + { + checkName (canonicalName); + if (aliases != null) + { + int n = aliases.length; + for (int i = 0; i < n; ++i) + checkName (aliases[i]); + } + + cachedEncoder = null; + cachedDecoder = null; + this.canonicalName = canonicalName; + this.aliases = aliases; + } + + /** + * @throws IllegalCharsetNameException if the name is illegal + */ + private static void checkName (String name) + { + int n = name.length (); + + if (n == 0) + throw new IllegalCharsetNameException (name); + + char ch = name.charAt (0); + if (!(('A' <= ch && ch <= 'Z') + || ('a' <= ch && ch <= 'z') + || ('0' <= ch && ch <= '9'))) + throw new IllegalCharsetNameException (name); + + for (int i = 1; i < n; ++i) + { + ch = name.charAt (i); + if (!(('A' <= ch && ch <= 'Z') + || ('a' <= ch && ch <= 'z') + || ('0' <= ch && ch <= '9') + || ch == '-' || ch == '.' || ch == ':' || ch == '_')) + throw new IllegalCharsetNameException (name); + } + } + + /** + * Returns the system default charset. + * + * This may be set by the user or VM with the file.encoding + * property. + * + * @since 1.5 + */ + public static Charset defaultCharset() + { + String encoding; + + try + { + encoding = SystemProperties.getProperty("file.encoding"); + } + catch(SecurityException e) + { + // Use fallback. + encoding = "ISO-8859-1"; + } + catch(IllegalArgumentException e) + { + // Use fallback. + encoding = "ISO-8859-1"; + } + + try + { + return forName(encoding); + } + catch(UnsupportedCharsetException e) + { + // Ignore. + } + catch(IllegalCharsetNameException e) + { + // Ignore. + } + catch(IllegalArgumentException e) + { + // Ignore. + } + + throw new IllegalStateException("Can't get default charset!"); + } + + public static boolean isSupported (String charsetName) + { + return charsetForName (charsetName) != null; + } + + /** + * Returns the Charset instance for the charset of the given name. + * + * @param charsetName + * @return the Charset instance for the indicated charset + * @throws UnsupportedCharsetException if this VM does not support + * the charset of the given name. + * @throws IllegalCharsetNameException if the given charset name is + * legal. + * @throws IllegalArgumentException if charsetName is null. + */ + public static Charset forName (String charsetName) + { + // Throws IllegalArgumentException as the JDK does. + if(charsetName == null) + throw new IllegalArgumentException("Charset name must not be null."); + + Charset cs = charsetForName (charsetName); + if (cs == null) + throw new UnsupportedCharsetException (charsetName); + return cs; + } + + /** + * Retrieves a charset for the given charset name. + * + * @return A charset object for the charset with the specified name, or + * null if no such charset exists. + * + * @throws IllegalCharsetNameException if the name is illegal + */ + private static Charset charsetForName(String charsetName) + { + checkName (charsetName); + // Try the default provider first + // (so we don't need to load external providers unless really necessary) + // if it is an exotic charset try loading the external providers. + Charset cs = provider().charsetForName(charsetName); + if (cs == null) + { + CharsetProvider[] providers = providers2(); + for (int i = 0; i < providers.length; i++) + { + cs = providers[i].charsetForName(charsetName); + if (cs != null) + break; + } + } + return cs; + } + + public static SortedMap availableCharsets() + { + TreeMap charsets + = new TreeMap(String.CASE_INSENSITIVE_ORDER); + for (Iterator i = provider().charsets(); i.hasNext(); ) + { + Charset cs = i.next(); + charsets.put(cs.name(), cs); + } + + CharsetProvider[] providers = providers2(); + for (int j = 0; j < providers.length; j++) + { + for (Iterator i = providers[j].charsets(); i.hasNext(); ) + { + Charset cs = (Charset) i.next(); + charsets.put(cs.name(), cs); + } + } + + return Collections.unmodifiableSortedMap(charsets); + } + + private static CharsetProvider provider() + { + try + { + String s = System.getProperty("charset.provider"); + if (s != null) + { + CharsetProvider p = + (CharsetProvider) ((Class.forName(s)).newInstance()); + return p; + } + } + catch (Exception e) + { + // Ignore. + } + + return Provider.provider(); + } + + /** + * We need to support multiple providers, reading them from + * java.nio.charset.spi.CharsetProvider in the resource directory + * META-INF/services. This returns the "extra" charset providers. + */ + private static CharsetProvider[] providers2() + { + if (providers == null) + { + try + { + Iterator i = ServiceFactory.lookupProviders(CharsetProvider.class); + LinkedHashSet set = new LinkedHashSet(); + while (i.hasNext()) + set.add(i.next()); + + providers = new CharsetProvider[set.size()]; + set.toArray(providers); + } + catch (Exception e) + { + throw new RuntimeException(e); + } + } + return providers; + } + + public final String name () + { + return canonicalName; + } + + public final Set aliases () + { + if (aliases == null) + return Collections.emptySet(); + + // should we cache the aliasSet instead? + int n = aliases.length; + HashSet aliasSet = new HashSet (n); + for (int i = 0; i < n; ++i) + aliasSet.add (aliases[i]); + return Collections.unmodifiableSet (aliasSet); + } + + public String displayName () + { + return canonicalName; + } + + public String displayName (Locale locale) + { + return canonicalName; + } + + public final boolean isRegistered () + { + return (!canonicalName.startsWith ("x-") + && !canonicalName.startsWith ("X-")); + } + + public abstract boolean contains (Charset cs); + + public abstract CharsetDecoder newDecoder (); + + public abstract CharsetEncoder newEncoder (); + + public boolean canEncode () + { + return true; + } + + // NB: This implementation serializes different threads calling + // Charset.encode(), a potential performance problem. It might + // be better to remove the cache, or use ThreadLocal to cache on + // a per-thread basis. + public final synchronized ByteBuffer encode (CharBuffer cb) + { + try + { + if (cachedEncoder == null) + { + cachedEncoder = newEncoder () + .onMalformedInput (CodingErrorAction.REPLACE) + .onUnmappableCharacter (CodingErrorAction.REPLACE); + } else + cachedEncoder.reset(); + return cachedEncoder.encode (cb); + } + catch (CharacterCodingException e) + { + throw new AssertionError (e); + } + } + + public final ByteBuffer encode (String str) + { + return encode (CharBuffer.wrap (str)); + } + + // NB: This implementation serializes different threads calling + // Charset.decode(), a potential performance problem. It might + // be better to remove the cache, or use ThreadLocal to cache on + // a per-thread basis. + public final synchronized CharBuffer decode (ByteBuffer bb) + { + try + { + if (cachedDecoder == null) + { + cachedDecoder = newDecoder () + .onMalformedInput (CodingErrorAction.REPLACE) + .onUnmappableCharacter (CodingErrorAction.REPLACE); + } else + cachedDecoder.reset(); + + return cachedDecoder.decode (bb); + } + catch (CharacterCodingException e) + { + throw new AssertionError (e); + } + } + + public final int compareTo (Charset other) + { + return canonicalName.compareToIgnoreCase (other.canonicalName); + } + + public final int hashCode () + { + return canonicalName.hashCode (); + } + + public final boolean equals (Object ob) + { + if (ob instanceof Charset) + return canonicalName.equalsIgnoreCase (((Charset) ob).canonicalName); + else + return false; + } + + public final String toString () + { + return canonicalName; + } +} -- cgit v1.2.3