Package org.apache.hadoop.hbase

Class ArrayBackedTag

java.lang.Object

org.apache.hadoop.hbase.ArrayBackedTag

All Implemented Interfaces:

Tag

@Private
@Evolving
public class ArrayBackedTag
extends Object
implements Tag

This is a Tag implementation in which value is backed by an on heap byte array.

Field Summary

Fields

Modifier and Type	Field	Description
private final byte[]	bytes
private int	length
private int	offset
private final byte	type

Fields inherited from interface org.apache.hadoop.hbase.Tag

CUSTOM_TAG_TYPE_RANGE, INFRASTRUCTURE_SIZE, MAX_TAG_LENGTH, TAG_LENGTH_SIZE, TYPE_LENGTH_SIZE

Constructor Summary

Constructors

Constructor	Description
ArrayBackedTag(byte[] bytes, int offset)	Creates a Tag from the specified byte array and offset.
ArrayBackedTag(byte[] bytes, int offset, int length)	Creates a Tag from the specified byte array, starting at offset, and for length length.
ArrayBackedTag(byte tagType, byte[] tag)	Format for a tag : <length of tag - 2 bytes><type code - 1 byte><tag> tag length is serialized using 2 bytes only but as this will be unsigned, we can have max tag length of (Short.MAX_SIZE * 2) +1.
ArrayBackedTag(byte tagType, String tag)	The special tag will write the length of each tag and that will be followed by the type and then the actual tag.

Method Summary

Modifier and Type	Method	Description
private static int	getLength(byte[] bytes, int offset)
byte	getType()	Returns the tag type
byte[]	getValueArray()	Returns The byte array backing this Tag.
ByteBuffer	getValueByteBuffer()	Returns The ByteBuffer containing the value bytes.
int	getValueLength()	Returns Length of actual tag bytes within the backed buffer
int	getValueOffset()	Returns Offset of actual tag bytes within the backed buffer
boolean	hasArray()	Return true if the tag is backed by a byte array
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

type

private final byte type

bytes

private final byte[] bytes

offset

private int offset

length

private int length

Constructor Details

ArrayBackedTag

public ArrayBackedTag(byte tagType,
 String tag)

The special tag will write the length of each tag and that will be followed by the type and then the actual tag. So every time the length part is parsed we need to add + 1 byte to it to get the type and then get the actual tag.

ArrayBackedTag

public ArrayBackedTag(byte tagType,
 byte[] tag)

Format for a tag : <length of tag - 2 bytes><type code - 1 byte><tag> tag length is serialized using 2 bytes only but as this will be unsigned, we can have max tag length of (Short.MAX_SIZE * 2) +1. It includes 1 byte type length and actual tag bytes length.

ArrayBackedTag

public ArrayBackedTag(byte[] bytes,
 int offset)

Creates a Tag from the specified byte array and offset. Presumes bytes content starting at offset is formatted as a Tag blob. The bytes to include the tag type, tag length and actual tag bytes.

Parameters:

offset - offset to start of Tag

ArrayBackedTag

public ArrayBackedTag(byte[] bytes,
 int offset,
 int length)

Creates a Tag from the specified byte array, starting at offset, and for length length. Presumes bytes content starting at offset is formatted as a Tag blob.

Method Details

getLength

private static int getLength(byte[] bytes,
 int offset)

getValueArray

public byte[] getValueArray()

Returns The byte array backing this Tag.

Specified by:

getValueArray in interface Tag

getType

public byte getType()

Returns the tag type

Specified by:

getType in interface Tag

getValueLength

public int getValueLength()

Returns Length of actual tag bytes within the backed buffer

Specified by:

getValueLength in interface Tag

getValueOffset

public int getValueOffset()

Returns Offset of actual tag bytes within the backed buffer

Specified by:

getValueOffset in interface Tag

hasArray

public boolean hasArray()

Description copied from interface: Tag

Return true if the tag is backed by a byte array

Specified by:

hasArray in interface Tag

getValueByteBuffer

public ByteBuffer getValueByteBuffer()

Description copied from interface: Tag

Returns The ByteBuffer containing the value bytes.

Specified by:

getValueByteBuffer in interface Tag

toString

public String toString()

Overrides:

toString in class Object