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/*
* DataConverter.java February 2014
*
* Copyright (C) 2014, Niall Gallagher <niallg@users.sf.net>
*
* 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.simpleframework.http.socket;
/**
* The <code>DataConverter</code> object is used to convert binary data
* to text data and vice versa. According to RFC 6455 a particular text
* frame might include a partial UTF-8 sequence; however, the whole
* message MUST contain valid UTF-8.
*
* @author Niall Gallagher
*
* @see org.simpleframework.http.socket.DataFrame
*/
public class DataConverter {
/**
* This is the character encoding used to convert the text data.
*/
private final String charset;
/**
* Constructor for the <code>DataConverter</code> object. By default
* this uses UTF-8 character encoding to convert text data as this
* is what is required for RFC 6455 section 5.6.
*/
public DataConverter() {
this("UTF-8");
}
/**
* Constructor for the <code>DataConverter</code> object. This can be
* used to specific a character encoding other than UTF-8. However it
* is not recommended as RFC 6455 section 5.6 suggests the frame must
* contain valid UTF-8 data.
*
* @param charset the character encoding to be used
*/
public DataConverter(String charset) {
this.charset = charset;
}
/**
* This method is used to convert text using the character encoding
* specified when constructing the converter. Typically this will use
* UTF-8 as required by RFC 6455.
*
* @param text this is the string to convert to a byte array
*
* @return a byte array decoded using the specified encoding
*/
public byte[] convert(String text) {
try {
return text.getBytes(charset);
} catch(Exception e) {
throw new IllegalStateException("Could not encode text as " + charset, e);
}
}
/**
* This method is used to convert data using the character encoding
* specified when constructing the converter. Typically this will use
* UTF-8 as required by RFC 6455.
*
* @param text this is the byte array to convert to a string
*
* @return a string encoded using the specified encoding
*/
public String convert(byte[] binary) {
try {
return new String(binary, charset);
} catch(Exception e) {
throw new IllegalStateException("Could not decode data as " + charset, e);
}
}
/**
* This method is used to convert data using the character encoding
* specified when constructing the converter. Typically this will use
* UTF-8 as required by RFC 6455.
*
* @param text this is the byte array to convert to a string
* @param offset the is the offset to read the bytes from
* @param size this is the number of bytes to be used
*
* @return a string encoded using the specified encoding
*/
public String convert(byte[] binary, int offset, int size) {
try {
return new String(binary, offset, size, charset);
} catch(Exception e) {
throw new IllegalStateException("Could not decode data as " + charset, e);
}
}
}
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