QCodec (Apache Commons Codec 1.9 API)

java.lang.Object
- org.apache.commons.codec.net.QCodec

All Implemented Interfaces:

Decoder, Encoder, StringDecoder, StringEncoder
```
public class QCodec
extends Object
implements StringEncoder, StringDecoder
```
Similar to the Quoted-Printable content-transfer-encoding defined in RFC 1521 and designed to allow text containing mostly ASCII characters to be decipherable on an ASCII terminal without decoding.
RFC 1522 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.
This class is conditionally thread-safe. The instance field encodeBlanks is mutable setEncodeBlanks(boolean) but is not volatile, and accesses are not synchronised. If an instance of the class is shared between threads, the caller needs to ensure that suitable synchronisation is used to ensure safe publication of the value between threads, and must not invoke setEncodeBlanks(boolean) after initial setup.

Since:

1.3

Version:

$Id: QCodec.html 891688 2013-12-24 20:49:46Z ggregory $

See Also:
MIME (Multipurpose Internet Mail Extensions) Part Two: Message Header Extensions for Non-ASCII Text

Field Summary

Fields
Modifier and Type Field and Description

protected static String POSTFIX
Prefix.

protected static String PREFIX
Postfix.

protected static char SEP
Separator.

Fields
Modifier and Type	Field and Description
`protected static String`	`POSTFIX` Prefix.
`protected static String`	`PREFIX` Postfix.
`protected static char`	`SEP` Separator.

Constructor Summary

Constructors
Constructor and Description
`QCodec()` Default constructor.
`QCodec(Charset charset)` Constructor which allows for the selection of a default charset.
`QCodec(String charsetName)` Constructor which allows for the selection of a default charset.

Method Summary

Methods
Modifier and Type	Method and Description
`Object`	`decode(Object obj)` Decodes a quoted-printable object into its original form.
`String`	`decode(String str)` Decodes a quoted-printable string into its original form.
`protected String`	`decodeText(String text)` Applies an RFC 1522 compliant decoding scheme to the given string of text.
`protected byte[]`	`doDecoding(byte[] bytes)` Decodes an array of bytes using the defined encoding scheme.
`protected byte[]`	`doEncoding(byte[] bytes)` Encodes an array of bytes using the defined encoding scheme.
`Object`	`encode(Object obj)` Encodes an object into its quoted-printable form using the default charset.
`String`	`encode(String str)` Encodes a string into its quoted-printable form using the default charset.
`String`	`encode(String str, Charset charset)` Encodes a string into its quoted-printable form using the specified charset.
`String`	`encode(String str, String charset)` Encodes a string into its quoted-printable form using the specified charset.
`protected String`	`encodeText(String text, Charset charset)` Applies an RFC 1522 compliant encoding scheme to the given string of text with the given charset.
`protected String`	`encodeText(String text, String charsetName)` Applies an RFC 1522 compliant encoding scheme to the given string of text with the given charset.
`Charset`	`getCharset()` Gets the default charset name used for string decoding and encoding.
`String`	`getDefaultCharset()` Gets the default charset name used for string decoding and encoding.
`protected String`	`getEncoding()` Returns the codec name (referred to as encoding in the RFC 1522).
`boolean`	`isEncodeBlanks()` Tests if optional transformation of SPACE characters is to be used
`void`	`setEncodeBlanks(boolean b)` Defines whether optional transformation of SPACE characters is to be used

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - SEP
```
protected static final char SEP
```
    Separator.
    
    See Also:
    Constant Field Values
  - POSTFIX
```
protected static final String POSTFIX
```
    Prefix.
    
    See Also:
    Constant Field Values
  - PREFIX
```
protected static final String PREFIX
```
    Postfix.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - QCodec
```
public QCodec()
```
    Default constructor.
  - QCodec
```
public QCodec(Charset charset)
```
    Constructor which allows for the selection of a default charset.
    
    Parameters:
    charset - the default string charset to use.
    Since:
    
    1.7
    
    See Also:
    Standard charsets
  - QCodec
```
public QCodec(String charsetName)
```
    Constructor which allows for the selection of a default charset.
    
    Parameters:
    charsetName - the charset to use.
    
    Throws:
    
    UnsupportedCharsetException - If the named charset is unavailable
    Since:
    
    1.7 throws UnsupportedCharsetException if the named charset is unavailable
    
    See Also:
    Standard charsets
- Method Detail
  - getEncoding
```
protected String getEncoding()
```
    Returns the codec name (referred to as encoding in the RFC 1522).
    
    Returns:
    name of the codec
  - doEncoding
```
protected byte[] doEncoding(byte[] bytes)
```
    Encodes an array of bytes using the defined encoding scheme.
    
    Parameters:
    bytes - Data to be encoded
    
    Returns:
    A byte array containing the encoded data
  - doDecoding
```
protected byte[] doDecoding(byte[] bytes)
                     throws DecoderException
```
    Decodes an array of bytes using the defined encoding scheme.
    
    Parameters:
    bytes - Data to be decoded
    
    Returns:
    a byte array that contains decoded data
    
    Throws:
    
    DecoderException - A decoder exception is thrown if a Decoder encounters a failure condition during the decode process.
  - encode
```
public String encode(String str,
            Charset charset)
              throws EncoderException
```
    Encodes a string into its quoted-printable form using the specified charset. Unsafe characters are escaped.
    
    Parameters:
    str - string to convert to quoted-printable form
    charset - the charset for str
    
    Returns:
    quoted-printable string
    
    Throws:
    
    EncoderException - thrown if a failure condition is encountered during the encoding process.
    Since:
    
    1.7
  - encode
```
public String encode(String str,
            String charset)
              throws EncoderException
```
    Encodes a string into its quoted-printable form using the specified charset. Unsafe characters are escaped.
    
    Parameters:
    str - string to convert to quoted-printable form
    charset - the charset for str
    
    Returns:
    quoted-printable string
    
    Throws:
    
    EncoderException - thrown if a failure condition is encountered during the encoding process.
  - encode
```
public String encode(String str)
              throws EncoderException
```
    Encodes a string into its quoted-printable form using the default charset. Unsafe characters are escaped.
    
    Specified by:
    
    encode in interface StringEncoder
    
    Parameters:
    str - string to convert to quoted-printable form
    
    Returns:
    quoted-printable string
    
    Throws:
    
    EncoderException - thrown if a failure condition is encountered during the encoding process.
  - decode
```
public String decode(String str)
              throws DecoderException
```
    Decodes a quoted-printable string into its original form. Escaped characters are converted back to their original representation.
    
    Specified by:
    
    decode in interface StringDecoder
    
    Parameters:
    str - quoted-printable string to convert into its original form
    
    Returns:
    original string
    
    Throws:
    
    DecoderException - A decoder exception is thrown if a failure condition is encountered during the decode process.
  - encode
```
public Object encode(Object obj)
              throws EncoderException
```
    Encodes an object into its quoted-printable form using the default charset. Unsafe characters are escaped.
    
    Specified by:
    
    encode in interface Encoder
    
    Parameters:
    obj - object to convert to quoted-printable form
    
    Returns:
    quoted-printable object
    
    Throws:
    
    EncoderException - thrown if a failure condition is encountered during the encoding process.
  - decode
```
public Object decode(Object obj)
              throws DecoderException
```
    Decodes a quoted-printable object into its original form. Escaped characters are converted back to their original representation.
    
    Specified by:
    
    decode in interface Decoder
    
    Parameters:
    obj - quoted-printable object to convert into its original form
    
    Returns:
    original object
    
    Throws:
    
    DecoderException - Thrown if the argument is not a String. Thrown if a failure condition is encountered during the decode process.
  - getCharset
```
public Charset getCharset()
```
    Gets the default charset name used for string decoding and encoding.
    
    Returns:
    the default charset name
    Since:
    
    1.7
  - getDefaultCharset
```
public String getDefaultCharset()
```
    Gets the default charset name used for string decoding and encoding.
    
    Returns:
    the default charset name
  - isEncodeBlanks
```
public boolean isEncodeBlanks()
```
    Tests if optional transformation of SPACE characters is to be used
    
    Returns:
    true if SPACE characters are to be transformed, false otherwise
  - setEncodeBlanks
```
public void setEncodeBlanks(boolean b)
```
    Defines whether optional transformation of SPACE characters is to be used
    
    Parameters:
    b - true if SPACE characters are to be transformed, false otherwise
  - encodeText
```
protected String encodeText(String text,
                Charset charset)
                     throws EncoderException
```
    Applies an RFC 1522 compliant encoding scheme to the given string of text with the given charset.
    This method constructs the "encoded-word" header common to all the RFC 1522 codecs and then invokes doEncoding(byte []) method of a concrete class to perform the specific encoding.
    
    Parameters:
    text - a string to encode
    charset - a charset to be used
    
    Returns:
    RFC 1522 compliant "encoded-word"
    
    Throws:
    
    EncoderException - thrown if there is an error condition during the Encoding process.
    See Also:
    Standard charsets
  - encodeText
```
protected String encodeText(String text,
                String charsetName)
                     throws EncoderException,
                            UnsupportedEncodingException
```
    Applies an RFC 1522 compliant encoding scheme to the given string of text with the given charset.
    This method constructs the "encoded-word" header common to all the RFC 1522 codecs and then invokes doEncoding(byte []) method of a concrete class to perform the specific encoding.
    
    Parameters:
    text - a string to encode
    charsetName - the charset to use
    
    Returns:
    RFC 1522 compliant "encoded-word"
    
    Throws:
    
    EncoderException - thrown if there is an error condition during the Encoding process.
    
    UnsupportedEncodingException - if charset is not available
    See Also:
    Standard charsets
  - decodeText
```
protected String decodeText(String text)
                     throws DecoderException,
                            UnsupportedEncodingException
```
    Applies an RFC 1522 compliant decoding scheme to the given string of text.
    This method processes the "encoded-word" header common to all the RFC 1522 codecs and then invokes doEncoding(byte []) method of a concrete class to perform the specific decoding.
    
    Parameters:
    text - a string to decode
    
    Returns:
    A new decoded String or null if the input is null.
    
    Throws:
    
    DecoderException - thrown if there is an error condition during the decoding process.
    
    UnsupportedEncodingException - thrown if charset specified in the "encoded-word" header is not supported

Class QCodec

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SEP

POSTFIX

PREFIX

Constructor Detail

QCodec

QCodec

QCodec

Method Detail

getEncoding

doEncoding

doDecoding

encode

encode

encode

decode

encode

decode

getCharset

getDefaultCharset

isEncodeBlanks

setEncodeBlanks

encodeText

encodeText

decodeText