/*
 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.sun.org.apache.xerces.internal.util.EncodingMap;
import java.io.UnsupportedEncodingException;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;


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.
Author:
Assaf Arkin
Deprecated:
As of JDK 9, Xerces 2.9.0, Xerces DOM L3 Serializer implementation is replaced by that of Xalan. Main class DOMSerializerImpl is replaced by LSSerializerImpl.
@LastModified
: Oct 2017/**
 * 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.
 *
 * @author <a href="mailto:arkin@intalio.com">Assaf Arkin</a>
 *
 * @deprecated As of JDK 9, Xerces 2.9.0, Xerces DOM L3 Serializer implementation
 * is replaced by that of Xalan. Main class
 * {@link com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl} is replaced
 * by {@link com.sun.org.apache.xml.internal.serializer.dom3.LSSerializerImpl}.
 *
 * @LastModified: Oct 2017
 */
@Deprecated
class Encodings
{


    
The last printable character for unknown 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 Map
    // is bounded by the number of encodings recognized by EncodingMap;
    // therefore it poses no static mutability risk.
    private static final Map<String, EncodingInfo> _encodings = new ConcurrentHashMap<>();

    
Params:
encoding – a MIME charset name, or null./**
     * @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 = _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 = _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 = _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";

}