com.jstatcom.util

Class Base64

java.lang.Object

com.jstatcom.util.Base64

public class Base64
extends java.lang.Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Base64.InputStream A Base64.InputStream will read data from another java.io.InputStream, given in the constructor, and encode/decode to/from Base64 notation on the fly.
static class	Base64.OutputStream A Base64.OutputStream will write data to another java.io.OutputStream, given in the constructor, and encode/decode to/from Base64 notation on the fly.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DECODE Specify decoding.
static int	DONT_BREAK_LINES Don't break lines when encoding (violates strict Base64 specification)
static int	ENCODE Specify encoding.
static int	GZIP Specify that data should be gzip-compressed.
static int	NO_OPTIONS No options specified.

Method Summary

Modifier and Type	Method and Description
static byte[]	decode(byte[] source, int off, int len) Very low-level access to decoding ASCII characters in the form of a byte array.
static byte[]	decode(java.lang.String s) Decodes data from Base64 notation, automatically detecting gzip-compressed data and decompressing it.
static byte[]	decodeFromFile(java.lang.String filename) Convenience method for reading a base64-encoded file and decoding it.
static boolean	decodeToFile(java.lang.String dataToDecode, java.lang.String filename) Convenience method for decoding data to a file.
static java.lang.Object	decodeToObject(java.lang.String encodedObject) Attempts to decode Base64 data and deserialize a Java Object within.
static java.lang.String	encodeBytes(byte[] source) Encodes a byte array into Base64 notation.
static java.lang.String	encodeBytes(byte[] source, int options) Encodes a byte array into Base64 notation.
static java.lang.String	encodeBytes(byte[] source, int off, int len) Encodes a byte array into Base64 notation.
static java.lang.String	encodeBytes(byte[] source, int off, int len, int options) Encodes a byte array into Base64 notation.
static java.lang.String	encodeFromFile(java.lang.String filename) Convenience method for reading a binary file and base64-encoding it.
static java.lang.String	encodeObject(java.io.Serializable serializableObject) Serializes an object and returns the Base64-encoded version of that serialized object.
static java.lang.String	encodeObject(java.io.Serializable serializableObject, int options) Serializes an object and returns the Base64-encoded version of that serialized object.
static boolean	encodeToFile(byte[] dataToEncode, java.lang.String filename) Convenience method for encoding data to a file.

Methods inherited from class java.lang.Object

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

Field Detail

NO_OPTIONS

public static final int NO_OPTIONS

No options specified. Value is zero.

See Also:

Constant Field Values

ENCODE

public static final int ENCODE

Specify encoding.

See Also:

Constant Field Values

DECODE

public static final int DECODE

Specify decoding.

See Also:

Constant Field Values

GZIP

public static final int GZIP

Specify that data should be gzip-compressed.

See Also:

Constant Field Values

DONT_BREAK_LINES

public static final int DONT_BREAK_LINES

Don't break lines when encoding (violates strict Base64 specification)

See Also:

Constant Field Values

Method Detail

encodeObject

public static java.lang.String encodeObject(java.io.Serializable serializableObject)

Serializes an object and returns the Base64-encoded version of that serialized object. If the object cannot be serialized or there is another error, the method will return null. The object is not GZip-compressed before being encoded.

Parameters:

serializableObject - The object to encode

Returns:

The Base64-encoded object

Since:

1.4

encodeObject

public static java.lang.String encodeObject(java.io.Serializable serializableObject,
                                            int options)

Serializes an object and returns the Base64-encoded version of that serialized object. If the object cannot be serialized or there is another error, the method will return null.

Valid options:

     GZIP: gzip-compresses object before encoding it.
     DONT_BREAK_LINES: don't break lines at 76 characters
       <i>Note: Technically, this makes your encoding non-compliant.</i>
 

Example: encodeObject( myObj, Base64.GZIP ) or

Example: encodeObject( myObj, Base64.GZIP | Base64.DONT_BREAK_LINES )

Parameters:

serializableObject - The object to encode

options - Specified options

Returns:

The Base64-encoded object

Since:

2.0

See Also:

GZIP, DONT_BREAK_LINES

encodeBytes

public static java.lang.String encodeBytes(byte[] source)

Encodes a byte array into Base64 notation. Does not GZip-compress data.

Parameters:

source - The data to convert

Since:

1.4

encodeBytes

public static java.lang.String encodeBytes(byte[] source,
                                           int options)

Encodes a byte array into Base64 notation.

Valid options:

     GZIP: gzip-compresses object before encoding it.
     DONT_BREAK_LINES: don't break lines at 76 characters
       <i>Note: Technically, this makes your encoding non-compliant.</i>
 

Example: encodeBytes( myData, Base64.GZIP ) or

Example: encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )

Parameters:

source - The data to convert

options - Specified options

Since:

2.0

See Also:

GZIP, DONT_BREAK_LINES

encodeBytes

public static java.lang.String encodeBytes(byte[] source,
                                           int off,
                                           int len)

Encodes a byte array into Base64 notation. Does not GZip-compress data.

Parameters:

source - The data to convert

off - Offset in array where conversion should begin

len - Length of data to convert

Since:

1.4

encodeBytes

public static java.lang.String encodeBytes(byte[] source,
                                           int off,
                                           int len,
                                           int options)

Encodes a byte array into Base64 notation.

Valid options:

     GZIP: gzip-compresses object before encoding it.
     DONT_BREAK_LINES: don't break lines at 76 characters
       <i>Note: Technically, this makes your encoding non-compliant.</i>
 

Example: encodeBytes( myData, Base64.GZIP ) or

Example: encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )

Parameters:

source - The data to convert

off - Offset in array where conversion should begin

len - Length of data to convert

options - Specified options

Since:

2.0

See Also:

GZIP, DONT_BREAK_LINES

decode

public static byte[] decode(byte[] source,
                            int off,
                            int len)

Very low-level access to decoding ASCII characters in the form of a byte array. Does not support automatically gunzipping or any other "fancy" features.

Parameters:

source - The Base64 encoded data

off - The offset of where to begin decoding

len - The length of characters to decode

Returns:

decoded data

Since:

1.3

decode

public static byte[] decode(java.lang.String s)

Decodes data from Base64 notation, automatically detecting gzip-compressed data and decompressing it.

Parameters:

s - the string to decode

Returns:

the decoded data

Since:

1.4

decodeToObject

public static java.lang.Object decodeToObject(java.lang.String encodedObject)

Attempts to decode Base64 data and deserialize a Java Object within. Returns null if there was an error.

Parameters:

encodedObject - The Base64 data to decode

Returns:

The decoded and deserialized object

Since:

1.5

encodeToFile

public static boolean encodeToFile(byte[] dataToEncode,
                                   java.lang.String filename)

Convenience method for encoding data to a file.

Parameters:

dataToEncode - byte array of data to encode in base64 form

filename - Filename for saving encoded data

Returns:

true if successful, false otherwise

Since:

2.1

decodeToFile

public static boolean decodeToFile(java.lang.String dataToDecode,
                                   java.lang.String filename)

Convenience method for decoding data to a file.

Parameters:

dataToDecode - Base64-encoded data as a string

filename - Filename for saving decoded data

Returns:

true if successful, false otherwise

Since:

2.1

decodeFromFile

public static byte[] decodeFromFile(java.lang.String filename)

Convenience method for reading a base64-encoded file and decoding it.

Parameters:

filename - Filename for reading encoded data

Returns:

decoded byte array or null if unsuccessful

Since:

2.1

encodeFromFile

public static java.lang.String encodeFromFile(java.lang.String filename)

Convenience method for reading a binary file and base64-encoding it.

Parameters:

filename - Filename for reading binary data

Returns:

base64-encoded string or null if unsuccessful

Since:

2.1