/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. *
* IN NO EVENT SHALL PUNCH TELEMATIX OR OTHER CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR *
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE *
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN *
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
**************************************************************************/
/*
** $Id: Decoder.java,v 1.1.1.1 2004/07/12 14:07:47 cvs Exp $
*/
package wonka.decoders;
import java.io.*;
public abstract class Decoder {
static final int UNDEFINED = 0;
static final int BIGEND = 1;
static final int LITTLEEND = 2;
private static final int HT_SIZE = 47;
private static final String[] names;
private static final Object[] decoders;
public static final Decoder DEFAULT;
static {
decoders = new Object[HT_SIZE];
names = new String[HT_SIZE];
String s = "ASCIIDecoder";
put("ASCII", s);
put("US-ASCII", s);
put("ISO646-US", s);
s = "UTF8Decoder";
put("UTF8", s);
put("UTF-8", s);
s = "UTF16Decoder";
put("UTF16", s);
put("UTF-16", s);
put("UNICODEBIGUNMARKED", "UTF16BeDecoder");
put("UTF-16BE", "UTF16BeDecoder");
put("UNICODELITTLEUNMARKED", "UTF16LeDecoder");
put("UTF-16LE", "UTF16LeDecoder");
put("UNICODELITTLE","UnicodeLittleDecoder");
put("UNICODEBIG","UnicodeBigDecoder");
put("UNICODE","UnicodeDecoder");
Decoder d = new Latin1Decoder();
DEFAULT = d;
put("ISO8859_1", d);
put("8859_1", d);
put("ISO8859-1", d);
put("ISO-8859-1", d);
put("ISO-8859-15", d);
put("ISO_8859-1", d);
put("ISO8859-15", d);
put("ISO8859_15", d);
put("ISO_8859-1:1978", d);
put("ISO_8859-1:1987", d);
put("ISO-IR-100", d);
put("LATIN1", d);
put("L1", d);
put("CSLSOLATIN1", d);
}
public static char[] decode(byte[] bytes, String enc) throws UnsupportedEncodingException {
return get(enc).bToC(bytes,0,bytes.length);
}
public static byte[] encode(char[] chars, String enc) throws UnsupportedEncodingException {
return get(enc).cToB(chars,0,chars.length);
}
public static Decoder getDefault(String key){
try {
return get(key);
}
catch(UnsupportedEncodingException uee){}
return DEFAULT;
}
public static Decoder get(String key) throws UnsupportedEncodingException {
String coding = key.toUpperCase();
int hash = coding.hashCode() % HT_SIZE;
String[] k = names;
String k2;
do {
if(hash < 0) hash += HT_SIZE;
k2 = k[hash];
if(k2 == null) {
throw new UnsupportedEncodingException(key);
} else if(coding.equals(k2)) {
Object o = decoders[hash];
try {
return ((Decoder)o).getInstance();
}
catch(ClassCastException cce){
try {
Decoder d = (Decoder)Class.forName("wonka.decoders."+o).newInstance();
decoders[hash] = d;
return d.getInstance();
}
catch(Exception e){
throw new UnsupportedEncodingException("Unable to initiate encoder for "+key);
}
}
}
hash--;
} while(true);
}
private static void put(String key, Object newvalue) throws NullPointerException {
int hash = key.hashCode() % HT_SIZE;
String[] k = names;
String k2;
do {
if(hash < 0) hash += HT_SIZE;
k2 = k[hash];
if(k2 == null) {
k[hash] = key;
decoders[hash] = newvalue;
return;
}
hash--;
} while(true);
}
public byte[] cToB(StringBuffer buffer){
int length = buffer.length();
char[] chars = new char[length];
buffer.getChars(0,length, chars,0);
return cToB(chars,0,length);
}
public abstract char[] bToC(byte[] bytes, int off, int len);
public abstract int cFromStream(InputStream in, char[] chars, int off, int len) throws IOException;
public abstract byte[] cToB(char[] chars, int off, int len);
public abstract int getChar(InputStream in) throws IOException;
public abstract String getEncoding();
/**
** some decoders can be shared between multiple objects. However others like UTF8Decoder need to be able to
** save and store data, making it hard to be shared between multiple objects and threads.
*/
protected Decoder getInstance(){
return this;
}
}