/**
* Copyright (C) 2004, 2005, 2006 Aelitis SAS, All rights Reserved
*
* This program 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 of the License.
*
* This program 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 ( see the LICENSE file ).
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* AELITIS, SAS au capital de 46,603.30 euros,
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*/
package org.gudy.azureus2.core3.internat;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.util.*;
import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.util.*;
public class
LocaleUtil
{
private static final String systemEncoding = System.getProperty("file.encoding");
private static final String[] manual_charset = {
systemEncoding, // must be first entry due to code below that gets the system decoder
"Big5","EUC-JP","EUC-KR","GB18030","GB2312","GBK","ISO-2022-JP","ISO-2022-KR",
"Shift_JIS","KOI8-R",
"TIS-620", // added for bug #1008848
Constants.DEFAULT_ENCODING,"windows-1251",Constants.BYTE_ENCODING
};
// the general ones *must* also be members of the above manual ones
protected static final String[] generalCharsets = {
Constants.BYTE_ENCODING, Constants.DEFAULT_ENCODING, systemEncoding
};
private static LocaleUtil singleton = new LocaleUtil();
public static LocaleUtil
getSingleton()
{
return( singleton );
}
private LocaleUtilDecoder[] all_decoders;
private LocaleUtilDecoder[] general_decoders;
private LocaleUtilDecoder system_decoder;
private LocaleUtilDecoder fallback_decoder;
private
LocaleUtil()
{
List decoders = new ArrayList();
List decoder_names = new ArrayList();
for (int i = 0; i < manual_charset.length; i++) {
try {
String name = manual_charset[i];
CharsetDecoder decoder = Charset.forName(name).newDecoder();
if ( decoder != null ){
LocaleUtilDecoder lu_decoder = new LocaleUtilDecoderReal(decoders.size(),decoder);
decoder_names.add( lu_decoder.getName());
if ( i == 0 ){
system_decoder = lu_decoder;
}
decoders.add( lu_decoder );
}else if ( i == 0 ){
// Debug.out( "System decoder failed to be found!!!!" );
}
}catch (Exception ignore) {
}
}
general_decoders = new LocaleUtilDecoder[generalCharsets.length];
for (int i=0;i<general_decoders.length;i++){
int gi = decoder_names.indexOf( generalCharsets[i]);
if ( gi != -1 ){
general_decoders[i] = (LocaleUtilDecoder)decoders.get(gi);
}
}
boolean show_all = COConfigurationManager.getBooleanParameter("File.Decoder.ShowAll" );
if ( show_all ){
Map m = Charset.availableCharsets();
Iterator it = m.keySet().iterator();
while(it.hasNext()){
String charset_name = (String)it.next();
if ( !decoder_names.contains( charset_name)){
try {
CharsetDecoder decoder = Charset.forName(charset_name).newDecoder();
if ( decoder != null ){
LocaleUtilDecoder lu_decoder = new LocaleUtilDecoderReal(decoders.size(),decoder);
decoders.add( lu_decoder);
decoder_names.add( lu_decoder.getName());
}
} catch (Exception ignore) {
}
}
}
}
fallback_decoder = new LocaleUtilDecoderFallback(decoders.size());
decoders.add( fallback_decoder );
all_decoders = new LocaleUtilDecoder[ decoders.size()];
decoders.toArray( all_decoders);
}
public String
getSystemEncoding()
{
return( systemEncoding );
}
public LocaleUtilDecoder[]
getDecoders()
{
return( all_decoders );
}
public LocaleUtilDecoder[]
getGeneralDecoders()
{
return( general_decoders );
}
public LocaleUtilDecoder getFallBackDecoder() {
return fallback_decoder;
}
public LocaleUtilDecoder
getSystemDecoder()
{
return( system_decoder );
}
/**
* Determine which locales are candidates for handling the supplied type of
* string
*
* @param array String in an byte array
* @return list of candidates. Valid candidates have getDecoder() non-null
*/
protected LocaleUtilDecoderCandidate[]
getCandidates(
byte[] array )
{
LocaleUtilDecoderCandidate[] candidates = new LocaleUtilDecoderCandidate[all_decoders.length];
boolean show_less_likely_conversions = COConfigurationManager.getBooleanParameter("File.Decoder.ShowLax" );
for (int i = 0; i < all_decoders.length; i++){
candidates[i] = new LocaleUtilDecoderCandidate(i);
try{
LocaleUtilDecoder decoder = all_decoders[i];
String str = decoder.tryDecode( array, show_less_likely_conversions );
if ( str != null ){
candidates[i].setDetails( decoder, str );
}
} catch (Exception ignore) {
}
}
/*
System.out.println( "getCandidates: = " + candidates.length );
for (int i=0;i<candidates.length;i++){
LocaleUtilDecoderCandidate cand = candidates[i];
if ( cand != null ){
String value = cand.getValue();
if ( value != null ){
System.out.println( cand.getDecoder().getName() + "/" + (value==null?-1:value.length()) + "/" + value );
}
}
}
*/
return candidates;
}
/**
* Determine which decoders are candidates for handling the supplied type of
* string
*
* @param array String in a byte array
* @return list of possibly valid decoders. LocaleUtilDecoder
*/
protected List
getCandidateDecoders(
byte[] array )
{
LocaleUtilDecoderCandidate[] candidates = getCandidates( array );
List decoders = new ArrayList();
for (int i=0;i<candidates.length;i++){
LocaleUtilDecoder d = candidates[i].getDecoder();
if (d != null)
decoders.add(d);
}
return decoders;
}
/**
*
* @param array
* @return List of LocaleUtilDecoderCandidate
*/
protected List getCandidatesAsList(byte[] array) {
LocaleUtilDecoderCandidate[] candidates = getCandidates(array);
List candidatesList = new ArrayList();
for (int i = 0; i < candidates.length; i++) {
if (candidates[i].getDecoder() != null)
candidatesList.add(candidates[i]);
}
return candidatesList;
}
}