Package org.apache.commons.io

Class ByteOrderMark

java.lang.Object

org.apache.commons.io.ByteOrderMark

All Implemented Interfaces:

Serializable

public class ByteOrderMark
extends Object
implements Serializable

Byte Order Mark (BOM) representation. See BOMInputStream.

We define the follow BOM constants:

• UTF_16BE
• UTF_16LE
• UTF_32BE
• UTF_32LE
• UTF_8

Deprecating Serialization

Serialization is deprecated and will be removed in 3.0.

Since:

2.0

See Also:

• BOMInputStream
• Wikipedia: Byte Order Mark
• W3C: Autodetection of Character Encodings (Non-Normative)
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final ByteOrderMark	UTF_16BE	UTF-16BE BOM (Big-Endian).
static final ByteOrderMark	UTF_16LE	UTF-16LE BOM (Little-Endian).
static final ByteOrderMark	UTF_32BE	UTF-32BE BOM (Big-Endian).
static final ByteOrderMark	UTF_32LE	UTF-32LE BOM (Little-Endian).
static final ByteOrderMark	UTF_8	UTF-8 BOM.
static final char	UTF_BOM	Unicode BOM character; external form depends on the encoding.

Constructor Summary

Constructors

Constructor	Description
ByteOrderMark(String charsetName, int... bytes)	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	Indicates if this instance's bytes equals another.
int	get(int pos)	Gets the byte at the specified position.
byte[]	getBytes()	Gets a copy of the BOM's bytes.
String	getCharsetName()	Gets the name of the Charset the BOM represents.
int	hashCode()	Computes the hash code for this BOM.
int	length()	Gets the length of the BOM's bytes.
String	toString()	Converts this instance to a String representation of the BOM.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

UTF_8

public static final ByteOrderMark UTF_8

UTF-8 BOM.

This BOM is:

 0xEF 0xBB 0xBF
 

UTF_16BE

public static final ByteOrderMark UTF_16BE

UTF-16BE BOM (Big-Endian).

This BOM is:

 0xFE 0xFF
 

UTF_16LE

public static final ByteOrderMark UTF_16LE

UTF-16LE BOM (Little-Endian).

This BOM is:

 0xFF 0xFE
 

UTF_32BE

public static final ByteOrderMark UTF_32BE

UTF-32BE BOM (Big-Endian).

This BOM is:

 0x00 0x00 0xFE 0xFF
 

Since:

2.2

UTF_32LE

public static final ByteOrderMark UTF_32LE

UTF-32LE BOM (Little-Endian).

This BOM is:

 0xFF 0xFE 0x00 0x00
 

Since:

2.2

UTF_BOM

public static final char UTF_BOM

Unicode BOM character; external form depends on the encoding.

Since:

2.5

See Also:

• Byte Order Mark (BOM) FAQ
• Constant Field Values

Constructor Details

ByteOrderMark

public ByteOrderMark(String charsetName,
 int... bytes)

Constructs a new instance.

Parameters:

charsetName - The name of the charset the BOM represents

bytes - The BOM's bytes

Throws:

IllegalArgumentException - if the charsetName is zero length

IllegalArgumentException - if the bytes are zero length

Method Details

equals

public boolean equals(Object obj)

Indicates if this instance's bytes equals another.

Overrides:

equals in class Object

Parameters:

obj - The object to compare to

Returns:

true if the bom's bytes are equal, otherwise false

get

public int get(int pos)

Gets the byte at the specified position.

Parameters:

pos - The position

Returns:

The specified byte

getBytes

public byte[] getBytes()

Gets a copy of the BOM's bytes.

Returns:

a copy of the BOM's bytes

getCharsetName

public String getCharsetName()

Gets the name of the Charset the BOM represents.

Returns:

the character set name

hashCode

public int hashCode()

Computes the hash code for this BOM.

Overrides:

hashCode in class Object

Returns:

the hash code for this BOM.

See Also:

• Object.hashCode()

length

public int length()

Gets the length of the BOM's bytes.

Returns:

the length of the BOM's bytes

toString

public String toString()

Converts this instance to a String representation of the BOM.

Overrides:

toString in class Object

Returns:

the length of the BOM's bytes