org.apache.commons.codec.net
Class URLCodec

java.lang.Object
  org.apache.commons.codec.net.URLCodec

All Implemented Interfaces:

BinaryDecoder, BinaryEncoder, Decoder, Encoder, StringDecoder, StringEncoder

public class URLCodec
extends Object
implements BinaryEncoder, BinaryDecoder, StringEncoder, StringDecoder

Implements the 'www-form-urlencoded' encoding scheme, also misleadingly known as URL encoding.

For more detailed information please refer to Chapter 17.13.4 'Form content types' of the HTML 4.01 Specification

This codec is meant to be a replacement for standard Java classes URLEncoder and URLDecoder on older Java platforms, as these classes in Java versions below 1.4 rely on the platform's default charset encoding.

Since:

1.2

Version:

$Id: URLCodec.java 798416 2009-07-28 06:35:58Z ggregory $

Author:

Apache Software Foundation

Field Summary

protected String	charset The default charset used for string decoding and encoding.
protected static byte	ESCAPE_CHAR Consider this field final.
protected static BitSet	WWW_FORM_URL BitSet of www-form-url safe characters.

Constructor Summary

URLCodec()
Default constructor.

URLCodec(String charset)
Constructor which allows for the selection of a default charset

Method Summary

byte[]	decode(byte[] bytes) Decodes an array of URL safe 7-bit characters into an array of original bytes.
Object	decode(Object pObject) Decodes a URL safe object into its original form.
String	decode(String pString) Decodes a URL safe string into its original form using the default string charset.
String	decode(String pString, String charset) Decodes a URL safe string into its original form using the specified encoding.
static byte[]	decodeUrl(byte[] bytes) Decodes an array of URL safe 7-bit characters into an array of original bytes.
byte[]	encode(byte[] bytes) Encodes an array of bytes into an array of URL safe 7-bit characters.
Object	encode(Object pObject) Encodes an object into its URL safe form.
String	encode(String pString) Encodes a string into its URL safe form using the default string charset.
String	encode(String pString, String charset) Encodes a string into its URL safe form using the specified string charset.
static byte[]	encodeUrl(BitSet urlsafe, byte[] bytes) Encodes an array of bytes into an array of URL safe 7-bit characters.
String	getDefaultCharset() The default charset used for string decoding and encoding.
String	getEncoding() Deprecated. use #getDefaultCharset()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

charset

protected String charset

The default charset used for string decoding and encoding. Consider this field final. The next major release may break compatibility and make this field be final.

ESCAPE_CHAR

protected static byte ESCAPE_CHAR

Consider this field final. The next major release may break compatibility and make this field be final.

WWW_FORM_URL

protected static final BitSet WWW_FORM_URL

BitSet of www-form-url safe characters.

Constructor Detail

URLCodec

public URLCodec()

Default constructor.

URLCodec

public URLCodec(String charset)

Constructor which allows for the selection of a default charset

Parameters:

charset - the default string charset to use.

Method Detail

encodeUrl

public static final byte[] encodeUrl(BitSet urlsafe,
                                     byte[] bytes)

Encodes an array of bytes into an array of URL safe 7-bit characters. Unsafe characters are escaped.

Parameters:

urlsafe - bitset of characters deemed URL safe

bytes - array of bytes to convert to URL safe characters

Returns:

array of bytes containing URL safe characters

decodeUrl

public static final byte[] decodeUrl(byte[] bytes)
                              throws DecoderException

Decodes an array of URL safe 7-bit characters into an array of original bytes. Escaped characters are converted back to their original representation.

Parameters:

bytes - array of URL safe characters

Returns:

array of original bytes

Throws:

DecoderException - Thrown if URL decoding is unsuccessful

encode

public byte[] encode(byte[] bytes)

Encodes an array of bytes into an array of URL safe 7-bit characters. Unsafe characters are escaped.

Specified by:

encode in interface BinaryEncoder

Parameters:

bytes - array of bytes to convert to URL safe characters

Returns:

array of bytes containing URL safe characters

decode

public byte[] decode(byte[] bytes)
              throws DecoderException

Decodes an array of URL safe 7-bit characters into an array of original bytes. Escaped characters are converted back to their original representation.

Specified by:

decode in interface BinaryDecoder

Parameters:

bytes - array of URL safe characters

Returns:

array of original bytes

Throws:

DecoderException - Thrown if URL decoding is unsuccessful

encode

public String encode(String pString,
                     String charset)
              throws UnsupportedEncodingException

Encodes a string into its URL safe form using the specified string charset. Unsafe characters are escaped.

Parameters:

pString - string to convert to a URL safe form

charset - the charset for pString

Returns:

URL safe string

Throws:

UnsupportedEncodingException - Thrown if charset is not supported

encode

public String encode(String pString)
              throws EncoderException

Encodes a string into its URL safe form using the default string charset. Unsafe characters are escaped.

Specified by:

encode in interface StringEncoder

Parameters:

pString - string to convert to a URL safe form

Returns:

URL safe string

Throws:

EncoderException - Thrown if URL encoding is unsuccessful

See Also:

getDefaultCharset()

decode

public String decode(String pString,
                     String charset)
              throws DecoderException,
                     UnsupportedEncodingException

Decodes a URL safe string into its original form using the specified encoding. Escaped characters are converted back to their original representation.

Parameters:

pString - URL safe string to convert into its original form

charset - the original string charset

Returns:

original string

Throws:

DecoderException - Thrown if URL decoding is unsuccessful

UnsupportedEncodingException - Thrown if charset is not supported

decode

public String decode(String pString)
              throws DecoderException

Decodes a URL safe string into its original form using the default string charset. Escaped characters are converted back to their original representation.

Specified by:

decode in interface StringDecoder

Parameters:

pString - URL safe string to convert into its original form

Returns:

original string

Throws:

DecoderException - Thrown if URL decoding is unsuccessful

See Also:

getDefaultCharset()

encode

public Object encode(Object pObject)
              throws EncoderException

Encodes an object into its URL safe form. Unsafe characters are escaped.

Specified by:

encode in interface Encoder

Parameters:

pObject - string to convert to a URL safe form

Returns:

URL safe object

Throws:

EncoderException - Thrown if URL encoding is not applicable to objects of this type or if encoding is unsuccessful

decode

public Object decode(Object pObject)
              throws DecoderException

Decodes a URL safe object into its original form. Escaped characters are converted back to their original representation.

Specified by:

decode in interface Decoder

Parameters:

pObject - URL safe object to convert into its original form

Returns:

original object

Throws:

DecoderException - Thrown if the argument is not a String or byte[]. Thrown if a failure condition is encountered during the decode process.

getEncoding

public String getEncoding()

Deprecated. use #getDefaultCharset()

The String encoding used for decoding and encoding.

Returns:

Returns the encoding.

getDefaultCharset

public String getDefaultCharset()

The default charset used for string decoding and encoding.

Returns:

the default string charset.