org.apache.hadoop.fs

Enum XAttrCodec

java.lang.Object

java.lang.Enum<XAttrCodec>

org.apache.hadoop.fs.XAttrCodec

All Implemented Interfaces:

Serializable, Comparable<XAttrCodec>

@InterfaceAudience.Public
@InterfaceStability.Stable
public enum XAttrCodec
extends Enum<XAttrCodec>

The value of XAttr is byte[], this class is to covert byte[] to some kind of string representation or convert back. String representation is convenient for display and input. For example display in screen as shell response and json response, input as http or shell parameter.

Enum Constant Summary

Enum Constants

Enum Constant and Description
BASE64 Value encoded as base64 string is prefixed with 0s.
HEX Value encoded as hexadecimal string is prefixed with 0x.
TEXT Value encoded as text string is enclosed in double quotes (\").

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	decodeValue(String value) Decode string representation of a value and check whether it's encoded.
static String	encodeValue(byte[] value, XAttrCodec encoding) Encode byte[] value to string representation with encoding.
static XAttrCodec	valueOf(String name) Returns the enum constant of this type with the specified name.
static XAttrCodec[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

TEXT

public static final XAttrCodec TEXT

Value encoded as text string is enclosed in double quotes (\").

HEX

public static final XAttrCodec HEX

Value encoded as hexadecimal string is prefixed with 0x.

BASE64

public static final XAttrCodec BASE64

Value encoded as base64 string is prefixed with 0s.

Method Detail

values

public static XAttrCodec[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (XAttrCodec c : XAttrCodec.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static XAttrCodec valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

decodeValue

public static byte[] decodeValue(String value)
                          throws IOException

Decode string representation of a value and check whether it's encoded. If the given string begins with 0x or 0X, it expresses a hexadecimal number. If the given string begins with 0s or 0S, base64 encoding is expected. If the given string is enclosed in double quotes, the inner string is treated as text. Otherwise the given string is treated as text.

Parameters:

value - string representation of the value.

Returns:

byte[] the value

Throws:

IOException

encodeValue

public static String encodeValue(byte[] value,
                 XAttrCodec encoding)
                          throws IOException

Encode byte[] value to string representation with encoding. Values encoded as text strings are enclosed in double quotes (\"), while strings encoded as hexadecimal and base64 are prefixed with 0x and 0s, respectively.

Parameters:

value - byte[] value

encoding -

Returns:

String string representation of value

Throws:

IOException