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/*
* Copyright 2001-2004 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 org.apache.commons.codec.net;
import java.io.UnsupportedEncodingException;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.StringDecoder;
import org.apache.commons.codec.StringEncoder;
import org.apache.commons.codec.binary.Base64;
/**
* <p>
* Identical to the Base64 encoding defined by <a href="http://www.ietf.org/rfc/rfc1521.txt">RFC
* 1521</a> and allows a character set to be specified.
* </p>
*
* <p>
* <a href="http://www.ietf.org/rfc/rfc1522.txt">RFC 1522</a> describes techniques to allow the encoding of non-ASCII
* text in various portions of a RFC 822 [2] message header, in a manner which is unlikely to confuse existing message
* handling software.
* </p>
*
* @see <a href="http://www.ietf.org/rfc/rfc1522.txt">MIME (Multipurpose Internet Mail Extensions) Part Two: Message
* Header Extensions for Non-ASCII Text</a>
*
* @author Apache Software Foundation
* @since 1.3
* @version $Id: BCodec.java,v 1.5 2004/04/13 22:46:37 ggregory Exp $
*/
public class BCodec extends RFC1522Codec implements StringEncoder, StringDecoder {
/**
* The default charset used for string decoding and encoding.
*/
private String charset = StringEncodings.UTF8;
/**
* Default constructor.
*/
public BCodec() {
super();
}
/**
* Constructor which allows for the selection of a default charset
*
* @param charset
* the default string charset to use.
*
* @see <a href="http://java.sun.com/j2se/1.3/docs/api/java/lang/package-summary.html#charenc">JRE character
* encoding names</a>
*/
public BCodec(final String charset) {
super();
this.charset = charset;
}
protected String getEncoding() {
return "B";
}
protected byte[] doEncoding(byte[] bytes) throws EncoderException {
if (bytes == null) {
return null;
}
return Base64.encodeBase64(bytes);
}
protected byte[] doDecoding(byte[] bytes) throws DecoderException {
if (bytes == null) {
return null;
}
return Base64.decodeBase64(bytes);
}
/**
* Encodes a string into its Base64 form using the specified charset. Unsafe characters are escaped.
*
* @param value
* string to convert to Base64 form
* @param charset
* the charset for pString
* @return Base64 string
*
* @throws EncoderException
* thrown if a failure condition is encountered during the encoding process.
*/
public String encode(final String value, final String charset) throws EncoderException {
if (value == null) {
return null;
}
try {
return encodeText(value, charset);
} catch (UnsupportedEncodingException e) {
throw new EncoderException(e.getMessage());
}
}
/**
* Encodes a string into its Base64 form using the default charset. Unsafe characters are escaped.
*
* @param value
* string to convert to Base64 form
* @return Base64 string
*
* @throws EncoderException
* thrown if a failure condition is encountered during the encoding process.
*/
public String encode(String value) throws EncoderException {
if (value == null) {
return null;
}
return encode(value, getDefaultCharset());
}
/**
* Decodes a Base64 string into its original form. Escaped characters are converted back to their original
* representation.
*
* @param value
* Base64 string to convert into its original form
*
* @return original string
*
* @throws DecoderException
* A decoder exception is thrown if a failure condition is encountered during the decode process.
*/
public String decode(String value) throws DecoderException {
if (value == null) {
return null;
}
try {
return decodeText(value);
} catch (UnsupportedEncodingException e) {
throw new DecoderException(e.getMessage());
}
}
/**
* Encodes an object into its Base64 form using the default charset. Unsafe characters are escaped.
*
* @param value
* object to convert to Base64 form
* @return Base64 object
*
* @throws EncoderException
* thrown if a failure condition is encountered during the encoding process.
*/
public Object encode(Object value) throws EncoderException {
if (value == null) {
return null;
} else if (value instanceof String) {
return encode((String) value);
} else {
throw new EncoderException("Objects of type "
+ value.getClass().getName()
+ " cannot be encoded using BCodec");
}
}
/**
* Decodes a Base64 object into its original form. Escaped characters are converted back to their original
* representation.
*
* @param value
* Base64 object to convert into its original form
*
* @return original object
*
* @throws DecoderException
* A decoder exception is thrown if a failure condition is encountered during the decode process.
*/
public Object decode(Object value) throws DecoderException {
if (value == null) {
return null;
} else if (value instanceof String) {
return decode((String) value);
} else {
throw new DecoderException("Objects of type "
+ value.getClass().getName()
+ " cannot be decoded using BCodec");
}
}
/**
* The default charset used for string decoding and encoding.
*
* @return the default string charset.
*/
public String getDefaultCharset() {
return this.charset;
}
}
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