/*
* Copyright 1999-2002,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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 1.2.6.1 2005/09/09 07:26:14 neerajbj Exp $
* @author <a href="mailto:arkin@intalio.com">Assaf Arkin</a>
*/
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<UNICODE_ENCODINGS.length; i++) {
if(UNICODE_ENCODINGS[i].equalsIgnoreCase(encoding)) {
eInfo = new EncodingInfo(EncodingMap.getJava2IANAMapping(encoding), encoding, LAST_PRINTABLE_UNICODE);
break;
}
}
if(i == UNICODE_ENCODINGS.length) {
eInfo = new EncodingInfo(EncodingMap.getJava2IANAMapping(encoding), encoding, DEFAULT_LAST_PRINTABLE);
}
_encodings.put(encoding, eInfo);
return eInfo;
} else {
throw new UnsupportedEncodingException(encoding);
}
}
if ((eInfo = (EncodingInfo)_encodings.get(jName)) != null)
return eInfo;
// have to create one...
// is it known to be unicode-compliant?
int i=0;
for(; i<UNICODE_ENCODINGS.length; i++) {
if(UNICODE_ENCODINGS[i].equalsIgnoreCase(jName)) {
eInfo = new EncodingInfo(encoding, jName, LAST_PRINTABLE_UNICODE);
break;
}
}
if(i == UNICODE_ENCODINGS.length) {
eInfo = new EncodingInfo(encoding, jName, DEFAULT_LAST_PRINTABLE);
}
_encodings.put(jName, eInfo);
return eInfo;
}
static final String JIS_DANGER_CHARS
= "\\\u007e\u007f\u00a2\u00a3\u00a5\u00ac"
+"\u2014\u2015\u2016\u2026\u203e\u203e\u2225\u222f\u301c"
+"\uff3c\uff5e\uffe0\uffe1\uffe2\uffe3";
}