Package org.h2.mvstore.type

Class MetaType<D>

java.lang.Object

org.h2.mvstore.type.BasicDataType<DataType<?>>

org.h2.mvstore.type.MetaType<D>

Type Parameters:

D - type of opaque parameter passed as an operational context to Factory.create()

All Implemented Interfaces:

Comparator<DataType<?>>, DataType<DataType<?>>

public final class MetaType<D>
extends BasicDataType<DataType<?>>

Class DBMetaType is a type for values in the type registry map.

Constructor Summary

Constructors

Constructor	Description
MetaType(D database, Thread.UncaughtExceptionHandler exceptionHandler)

Method Summary

Modifier and Type	Method	Description
int	compare(DataType<?> a, DataType<?> b)	Compare two keys.
DataType<?>[]	createStorage(int size)	Create storage object of array type to hold values
int	getMemory(DataType<?> obj)	Calculates the amount of used memory in bytes.
DataType<?>	read(ByteBuffer buff)	Read an object.
void	write(WriteBuffer buff, DataType<?> obj)	Write an object.

Methods inherited from class org.h2.mvstore.type.BasicDataType

binarySearch, cast, equals, hashCode, isMemoryEstimationAllowed, read, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

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

Constructor Details

MetaType

public MetaType(D database,
 Thread.UncaughtExceptionHandler exceptionHandler)

Method Details

compare

public int compare(DataType<?> a,
 DataType<?> b)

Description copied from interface: DataType

Compare two keys.

Specified by:

compare in interface Comparator<D>

Specified by:

compare in interface DataType<D>

Overrides:

compare in class BasicDataType<DataType<?>>

Parameters:

a - the first key

b - the second key

Returns:

-1 if the first key is smaller, 1 if larger, and 0 if equal

getMemory

public int getMemory(DataType<?> obj)

Description copied from interface: DataType

Calculates the amount of used memory in bytes.

Specified by:

getMemory in interface DataType<D>

Specified by:

getMemory in class BasicDataType<DataType<?>>

Parameters:

obj - the object

Returns:

the used memory

write

public void write(WriteBuffer buff,
 DataType<?> obj)

Description copied from interface: DataType

Write an object.

Specified by:

write in interface DataType<D>

Specified by:

write in class BasicDataType<DataType<?>>

Parameters:

buff - the target buffer

obj - the value

read

public DataType<?> read(ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType<D>

Specified by:

read in class BasicDataType<DataType<?>>

Parameters:

buff - the source buffer

Returns:

the object

createStorage

public DataType<?>[] 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