Class MVStoreTool.GenericDataType

java.lang.Object

org.h2.mvstore.type.BasicDataType<byte[]>

org.h2.mvstore.MVStoreTool.GenericDataType

All Implemented Interfaces:

Comparator<byte[]>, DataType<byte[]>

Enclosing class:

MVStoreTool

private static class MVStoreTool.GenericDataType
extends BasicDataType<byte[]>

A data type that can read any data that is persisted, and converts it to a byte array.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static MVStoreTool.GenericDataType	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	GenericDataType()

Method Summary

Modifier and Type	Method	Description
byte[][]	createStorage(int size)	Create storage object of array type to hold values
int	getMemory(byte[] obj)	Calculates the amount of used memory in bytes.
boolean	isMemoryEstimationAllowed()	Whether memory estimation based on previously seen values is allowed/desirable
byte[]	read(ByteBuffer buff)	Read an object.
void	write(WriteBuffer buff, byte[] obj)	Write an object.

Methods inherited from class BasicDataType

binarySearch, cast, compare, equals, hashCode, read, write

Methods inherited from class Object

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

Methods inherited from interface Comparator

reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Details

INSTANCE

static MVStoreTool.GenericDataType INSTANCE

Constructor Details

GenericDataType

private GenericDataType()

Method Details

isMemoryEstimationAllowed

public boolean isMemoryEstimationAllowed()

Description copied from interface: DataType

Whether memory estimation based on previously seen values is allowed/desirable

Specified by:

isMemoryEstimationAllowed in interface DataType<byte[]>

Overrides:

isMemoryEstimationAllowed in class BasicDataType<byte[]>

Returns:

true if memory estimation is allowed

getMemory

public int getMemory(byte[] obj)

Description copied from interface: DataType

Calculates the amount of used memory in bytes.

Specified by:

getMemory in interface DataType<byte[]>

Specified by:

getMemory in class BasicDataType<byte[]>

Parameters:

obj - the object

Returns:

the used memory

createStorage

public byte[][] createStorage(int size)

Description copied from interface: DataType

Create storage object of array type to hold values

Parameters:

size - number of values to hold

Returns:

storage object

write

public void write(WriteBuffer buff,
 byte[] obj)

Description copied from interface: DataType

Write an object.

Specified by:

write in interface DataType<byte[]>

Specified by:

write in class BasicDataType<byte[]>

Parameters:

buff - the target buffer

obj - the value

read

public byte[] read(ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType<byte[]>

Specified by:

read in class BasicDataType<byte[]>

Parameters:

buff - the source buffer

Returns:

the object