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package com.sun.org.apache.xml.internal.serialize;
import java.io.UnsupportedEncodingException;
import java.util.Hashtable;
import java.util.Locale;
import com.sun.org.apache.xerces.internal.util.EncodingMap;
/**
* Provides information about encodings. Depends on the Java runtime
* to provides writers for the different encodings, but can be used
* to override encoding names and provide the last printable character
* for each encoding.
*
* @version $Id: Encodings.java,v 1.6 2010-11-01 04:40:36 joehw Exp $
* @author Assaf Arkin
*/
public class Encodings
{
/**
* The last printable character for unknown encodings.
*/
static final int DEFAULT_LAST_PRINTABLE = 0x7F;
// last printable character for Unicode-compatible encodings
static final int LAST_PRINTABLE_UNICODE = 0xffff;
// unicode-compliant encodings; can express plane 0
static final String[] UNICODE_ENCODINGS = {
"Unicode", "UnicodeBig", "UnicodeLittle", "GB2312", "UTF8", "UTF-16",
};
// default (Java) encoding if none supplied:
static final String DEFAULT_ENCODING = "UTF8";
// note that the size of this Hashtable
// is bounded by the number of encodings recognized by EncodingMap;
// therefore it poses no static mutability risk.
static Hashtable _encodings = new Hashtable();
/**
* @param encoding a MIME charset name, or null.
*/
static EncodingInfo getEncodingInfo(String encoding, boolean allowJavaNames) throws UnsupportedEncodingException {
EncodingInfo eInfo = null;
if (encoding == null) {
if((eInfo = (EncodingInfo)_encodings.get(DEFAULT_ENCODING)) != null)
return eInfo;
eInfo = new EncodingInfo(EncodingMap.getJava2IANAMapping(DEFAULT_ENCODING), DEFAULT_ENCODING, LAST_PRINTABLE_UNICODE);
_encodings.put(DEFAULT_ENCODING, eInfo);
return eInfo;
}
// need to convert it to upper case:
encoding = encoding.toUpperCase(Locale.ENGLISH);
String jName = EncodingMap.getIANA2JavaMapping(encoding);
if(jName == null) {
// see if the encoding passed in is a Java encoding name.
if(allowJavaNames ) {
EncodingInfo.testJavaEncodingName(encoding);
if((eInfo = (EncodingInfo)_encodings.get(encoding)) != null)
return eInfo;
// is it known to be unicode-compliant?
int i=0;
for(; i