/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. 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. For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.i18n.text;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.net.BCodec;
import org.apache.commons.codec.net.QCodec;
public class Rfc2047Helper {
public static final String DEFAULT_CHARSET = "UTF-8";
public static enum Codec { B, Q };
public static String encode(
String value) {
return encode(
value,
DEFAULT_CHARSET,
Codec.B);
}
public static String encode(
String value,
String charset) {
return encode(
value,
charset,
Codec.B);
}
/**
* Used to encode a string as specified by RFC 2047
* @param value The string to encode
* @param charset The character set to use for the encoding
*/
public static String encode(
String value,
String charset,
Codec codec) {
if (value == null)
return null;
try {
switch(codec) {
case Q: return (new QCodec(charset)).encode(value);
case B:
default: return (new BCodec(charset)).encode(value);
}
} catch (Exception e) {
return value;
}
}
/**
* Used to decode a string as specified by RFC 2047
* @param value The encoded string
*/
public static String decode(
String value) {
if (value == null) return null;
try {
// try BCodec first
return (new BCodec()).decode(value);
} catch (DecoderException de) {
// try QCodec next
try {
return (new QCodec()).decode(value);
} catch (Exception ex) {
return value;
}
} catch (Exception e) {
return value;
}
}
}