org.apache.hadoop.hbase.io.encoding

枚举 DataBlockEncoding

java.lang.Object

java.lang.Enum<DataBlockEncoding>

org.apache.hadoop.hbase.io.encoding.DataBlockEncoding

所有已实现的接口:

Serializable, Comparable<DataBlockEncoding>

@InterfaceAudience.Public
@InterfaceStability.Evolving
public enum DataBlockEncoding
extends Enum<DataBlockEncoding>

Provide access to all data block encoding algorithms. All of the algorithms are required to have unique id which should NEVER be changed. If you want to add a new algorithm/version, assign it a new id. Announce the new id in the HBase mailing list to prevent collisions.

枚举常量概要

枚举常量

枚举常量和说明
DIFF
FAST_DIFF
NONE Disable data block encoding.
PREFIX
PREFIX_TREE
ROW_INDEX_V1

字段概要

字段

限定符和类型	字段和说明
static int	ID_SIZE

方法概要

方法

限定符和类型	方法和说明
protected static DataBlockEncoder	createEncoder(String fullyQualifiedClassName)
static DataBlockEncoder	getDataBlockEncoderById(short encoderId) Find and create data block encoder for given id;
DataBlockEncoder	getEncoder() Return new data block encoder for given algorithm type.
static DataBlockEncoding	getEncodingById(short dataBlockEncodingId)
short	getId()
static String	getNameFromId(short encoderId) Find and return the name of data block encoder for the given id.
byte[]	getNameInBytes()
static boolean	isCorrectEncoder(DataBlockEncoder encoder, short encoderId) Check if given encoder has this id.
static DataBlockEncoding	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static DataBlockEncoding[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。
void	writeIdInBytes(byte[] dest, int offset) Writes id bytes to the given array starting from offset.
void	writeIdInBytes(OutputStream stream) Writes id in bytes.

从类继承的方法 java.lang.Enum

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

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

NONE

public static final DataBlockEncoding NONE

Disable data block encoding.

PREFIX

public static final DataBlockEncoding PREFIX

DIFF

public static final DataBlockEncoding DIFF

FAST_DIFF

public static final DataBlockEncoding FAST_DIFF

PREFIX_TREE

public static final DataBlockEncoding PREFIX_TREE

ROW_INDEX_V1

public static final DataBlockEncoding ROW_INDEX_V1

字段详细资料

ID_SIZE

public static final int ID_SIZE

另请参阅:

常量字段值

方法详细资料

values

public static DataBlockEncoding[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

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

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static DataBlockEncoding valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值

getNameInBytes

public byte[] getNameInBytes()

返回:

name converted to bytes.

getId

public short getId()

返回:

The id of a data block encoder.

writeIdInBytes

public void writeIdInBytes(OutputStream stream)
                    throws IOException

Writes id in bytes.

参数:

stream - where the id should be written.

抛出:

IOException

writeIdInBytes

public void writeIdInBytes(byte[] dest,
                  int offset)
                    throws IOException

Writes id bytes to the given array starting from offset.

参数:

dest - output array

offset - starting offset of the output array

抛出:

IOException

getEncoder

public DataBlockEncoder getEncoder()

Return new data block encoder for given algorithm type.

返回:

data block encoder if algorithm is specified, null if none is selected.

getDataBlockEncoderById

public static DataBlockEncoder getDataBlockEncoderById(short encoderId)

Find and create data block encoder for given id;

参数:

encoderId - id of data block encoder.

返回:

Newly created data block encoder.

getNameFromId

public static String getNameFromId(short encoderId)

Find and return the name of data block encoder for the given id.

参数:

encoderId - id of data block encoder

返回:

name, same as used in options in column family

isCorrectEncoder

public static boolean isCorrectEncoder(DataBlockEncoder encoder,
                       short encoderId)

Check if given encoder has this id.

参数:

encoder - encoder which id will be checked

encoderId - id which we except

返回:

true if id is right for given encoder, false otherwise

抛出:

IllegalArgumentException - thrown when there is no matching data block encoder

getEncodingById

public static DataBlockEncoding getEncodingById(short dataBlockEncodingId)

createEncoder

protected static DataBlockEncoder createEncoder(String fullyQualifiedClassName)