DataBlockEncoding (Apache HBase 1.2.12 API)

java.lang.Object
- java.lang.Enum<DataBlockEncoding>
- - org.apache.hadoop.hbase.io.encoding.DataBlockEncoding

All Implemented Interfaces:

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.

Enum Constant Summary

Enum Constants
Enum Constant and Description

DIFF

FAST_DIFF

NONE
Disable data block encoding.

PREFIX

PREFIX_TREE

Enum Constants
Enum Constant and Description
`DIFF`
`FAST_DIFF`
`NONE` Disable data block encoding.
`PREFIX`
`PREFIX_TREE`

Field Summary

Fields
Modifier and Type Field and Description

static int ID_SIZE

Fields
Modifier and Type	Field and Description
`static int`	`ID_SIZE`

Method Summary

Methods
Modifier and Type	Method and Description
`protected static org.apache.hadoop.hbase.io.encoding.DataBlockEncoder`	`createEncoder(String fullyQualifiedClassName)`
`static org.apache.hadoop.hbase.io.encoding.DataBlockEncoder`	`getDataBlockEncoderById(short encoderId)` Find and create data block encoder for given id;
`org.apache.hadoop.hbase.io.encoding.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(org.apache.hadoop.hbase.io.encoding.DataBlockEncoder encoder, short encoderId)` Check if given encoder has this id.
`static DataBlockEncoding`	`valueOf(String name)` Returns the enum constant of this type with the specified name.
`static DataBlockEncoding[]`	`values()` Returns an array containing the constants of this enum type, in the order they are declared.
`void`	`writeIdInBytes(byte[] dest, int offset)` Writes id bytes to the given array starting from offset.
`void`	`writeIdInBytes(OutputStream stream)` Writes id in bytes.

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
  - 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
```
- Field Detail
  - ID_SIZE
```
public static final int ID_SIZE
```
    See Also:
    Constant Field Values
- Method Detail
  - values
```
public static DataBlockEncoding[] 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 (DataBlockEncoding c : DataBlockEncoding.values())
    System.out.println(c);
```
    Returns:
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static DataBlockEncoding 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
  - getNameInBytes
```
public byte[] getNameInBytes()
```
    Returns:
    name converted to bytes.
  - getId
```
public short getId()
```
    Returns:
    The id of a data block encoder.
  - writeIdInBytes
```
public void writeIdInBytes(OutputStream stream)
                    throws IOException
```
    Writes id in bytes.
    
    Parameters:
    stream - where the id should be written.
    
    Throws:
    
    IOException
  - writeIdInBytes
```
public void writeIdInBytes(byte[] dest,
                  int offset)
                    throws IOException
```
    Writes id bytes to the given array starting from offset.
    
    Parameters:
    dest - output array
    offset - starting offset of the output array
    
    Throws:
    
    IOException
  - getEncoder
```
public org.apache.hadoop.hbase.io.encoding.DataBlockEncoder getEncoder()
```
    Return new data block encoder for given algorithm type.
    
    Returns:
    data block encoder if algorithm is specified, null if none is selected.
  - getDataBlockEncoderById
```
public static org.apache.hadoop.hbase.io.encoding.DataBlockEncoder getDataBlockEncoderById(short encoderId)
```
    Find and create data block encoder for given id;
    
    Parameters:
    encoderId - id of data block encoder.
    
    Returns:
    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.
    
    Parameters:
    encoderId - id of data block encoder
    
    Returns:
    name, same as used in options in column family
  - isCorrectEncoder
```
public static boolean isCorrectEncoder(org.apache.hadoop.hbase.io.encoding.DataBlockEncoder encoder,
                       short encoderId)
```
    Check if given encoder has this id.
    
    Parameters:
    encoder - encoder which id will be checked
    encoderId - id which we except
    
    Returns:
    true if id is right for given encoder, false otherwise
    
    Throws:
    
    IllegalArgumentException - thrown when there is no matching data block encoder
  - getEncodingById
```
public static DataBlockEncoding getEncodingById(short dataBlockEncodingId)
```
  - createEncoder
```
protected static org.apache.hadoop.hbase.io.encoding.DataBlockEncoder createEncoder(String fullyQualifiedClassName)
```

Enum DataBlockEncoding

Enum Constant Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

NONE

PREFIX

DIFF

FAST_DIFF

PREFIX_TREE

Field Detail

ID_SIZE

Method Detail

values

valueOf

getNameInBytes

getId

writeIdInBytes

writeIdInBytes

getEncoder

getDataBlockEncoderById

getNameFromId

isCorrectEncoder

getEncodingById

createEncoder