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package java.nio.charset; |
package java.nio.charset; |
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import java.nio.ByteBuffer; |
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import java.nio.*; |
import java.nio.CharBuffer; |
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import java.util.HashSet; |
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public class Charset |
import java.util.Set; |
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import java.util.TreeMap; |
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import gnu.java.nio.charset.Provider; |
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/** |
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* @author Jesse Rosenstock |
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* @since 1.4 |
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*/ |
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public abstract class Charset implements Comparable |
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{ |
{ |
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public static Charset forName(String name) |
private final String canonicalName; |
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{ |
private final String[] aliases; |
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return new Charset(); |
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} |
protected Charset (String canonicalName, String[] aliases) |
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{ |
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public CharsetDecoder newDecoder() |
checkName (canonicalName); |
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{ |
if (aliases != null) |
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return new CharsetDecoder(this,2,2) |
{ |
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{ |
int n = aliases.length; |
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protected CoderResult decodeLoop(ByteBuffer in, |
for (int i = 0; i < n; ++i) |
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CharBuffer out) |
checkName (aliases[i]); |
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{ |
} |
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while (in.hasRemaining()) |
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{ |
this.canonicalName = canonicalName; |
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char a = (char) in.get(); |
this.aliases = aliases; |
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out.put(a); |
} |
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} |
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return null; |
/** |
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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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public CharsetEncoder newEncoder() |
int n = name.length (); |
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{ |
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return new CharsetEncoder(this,2,2) |
if (n == 0) |
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{ |
throw new IllegalCharsetNameException (name); |
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protected CoderResult encodeLoop(CharBuffer in, |
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ByteBuffer out) |
char ch = name.charAt (0); |
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{ |
if (!(('A' <= ch && ch <= 'Z') |
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//System.out.println("in encode loop:"+in.hasRemaining()); |
|| ('a' <= ch && ch <= 'z') |
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|| ('0' <= ch && ch <= '9'))) |
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while (in.hasRemaining()) |
throw new IllegalCharsetNameException (name); |
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{ |
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char a = in.get(); |
for (int i = 1; i < n; ++i) |
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out.put((byte)a); |
{ |
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ch = name.charAt (i); |
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//int len = out.position(); |
if (!(('A' <= ch && ch <= 'Z') |
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//System.out.println("pos="+len + ","+a); |
|| ('a' <= ch && ch <= 'z') |
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} |
|| ('0' <= ch && ch <= '9') |
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return null; |
|| ch == '-' || ch == '.' || ch == ':' || ch == '_')) |
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} |
throw new IllegalCharsetNameException (name); |
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}; |
} |
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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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public static Charset forName (String charsetName) |
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{ |
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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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return provider ().charsetForName (charsetName); |
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} |
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public static SortedMap availableCharsets () |
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{ |
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TreeMap charsets = new TreeMap (String.CASE_INSENSITIVE_ORDER); |
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for (Iterator i = provider ().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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return Collections.unmodifiableSortedMap (charsets); |
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} |
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// XXX: 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 |
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private static final CharsetProvider provider () |
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{ |
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return Provider.provider (); |
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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 aliases () |
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{ |
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if (aliases == null) |
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return Collections.EMPTY_SET; |
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// should we cache the aliasSet instead? |
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int n = aliases.length; |
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HashSet aliasSet = new HashSet (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 (String name) |
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{ |
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return !name.startsWith ("x-") && !name.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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public final ByteBuffer encode (CharBuffer cb) |
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{ |
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try |
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{ |
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// TODO: cache encoders between sucessive invocations |
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return newEncoder ().onMalformedInput (CodingErrorAction.REPLACE) |
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.onUnmappableCharacter (CodingErrorAction.REPLACE) |
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.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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public CharBuffer decode (ByteBuffer bb) |
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{ |
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try |
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{ |
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// TODO: cache encoders between sucessive invocations |
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return newDecoder ().onMalformedInput (CodingErrorAction.REPLACE) |
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.onUnmappableCharacter (CodingErrorAction.REPLACE) |
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.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 (Object ob) |
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{ |
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return canonicalName.compareToIgnoreCase (((Charset) ob).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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} |
} |