Package org.h2.mvstore.tx

Class VersionedValueType<T,D>

java.lang.Object

org.h2.mvstore.type.BasicDataType<VersionedValue<T>>

org.h2.mvstore.tx.VersionedValueType<T,D>

All Implemented Interfaces:

java.util.Comparator<VersionedValue<T>>, DataType<VersionedValue<T>>, StatefulDataType<D>

public class VersionedValueType<T,D>
extends BasicDataType<VersionedValue<T>>
implements StatefulDataType<D>

The value type for a versioned value.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	VersionedValueType.Factory<D>

Field Summary

Fields

Modifier and Type	Field	Description
private VersionedValueType.Factory<D>	factory
private DataType<T>	valueType

Constructor Summary

Constructors

Constructor	Description
VersionedValueType(DataType<T> valueType)

Method Summary

Modifier and Type	Method	Description
int	compare(VersionedValue<T> a, VersionedValue<T> b)	Compare two keys.
VersionedValue<T>[]	createStorage(int size)	Create storage object of array type to hold values
boolean	equals(java.lang.Object obj)
VersionedValueType.Factory<D>	getFactory()
int	getMemory(VersionedValue<T> v)	Calculates the amount of used memory in bytes.
private int	getValMemory(T obj)
int	hashCode()
VersionedValue<T>	read(java.nio.ByteBuffer buff)	Read an object.
void	read(java.nio.ByteBuffer buff, java.lang.Object storage, int len)	Read a list of objects.
void	save(WriteBuffer buff, MetaType<D> metaType)	Save the state.
void	write(WriteBuffer buff, java.lang.Object storage, int len)	Write a list of objects.
void	write(WriteBuffer buff, VersionedValue<T> v)	Write an object.

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

binarySearch, cast, isMemoryEstimationAllowed

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

Field Detail

valueType

private final DataType<T> valueType

factory

private final VersionedValueType.Factory<D> factory

Constructor Detail

VersionedValueType

public VersionedValueType(DataType<T> valueType)

Method Detail

createStorage

public VersionedValue<T>[] createStorage(int size)

Description copied from interface: DataType

Create storage object of array type to hold values

Specified by:

createStorage in interface DataType<T>

Parameters:

size - number of values to hold

Returns:

storage object

getMemory

public int getMemory(VersionedValue<T> v)

Description copied from interface: DataType

Calculates the amount of used memory in bytes.

Specified by:

getMemory in interface DataType<T>

Specified by:

getMemory in class BasicDataType<VersionedValue<T>>

Parameters:

v - the object

Returns:

the used memory

getValMemory

private int getValMemory(T obj)

read

public void read(java.nio.ByteBuffer buff,
                 java.lang.Object storage,
                 int len)

Description copied from interface: DataType

Read a list of objects.

Specified by:

read in interface DataType<T>

Overrides:

read in class BasicDataType<VersionedValue<T>>

Parameters:

buff - the target buffer

storage - the objects

len - the number of objects to read

read

public VersionedValue<T> read(java.nio.ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType<T>

Specified by:

read in class BasicDataType<VersionedValue<T>>

Parameters:

buff - the source buffer

Returns:

the object

write

public void write(WriteBuffer buff,
                  java.lang.Object storage,
                  int len)

Description copied from interface: DataType

Write a list of objects.

Specified by:

write in interface DataType<T>

Overrides:

write in class BasicDataType<VersionedValue<T>>

Parameters:

buff - the target buffer

storage - the objects

len - the number of objects to write

write

public void write(WriteBuffer buff,
                  VersionedValue<T> v)

Description copied from interface: DataType

Write an object.

Specified by:

write in interface DataType<T>

Specified by:

write in class BasicDataType<VersionedValue<T>>

Parameters:

buff - the target buffer

v - the value

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface java.util.Comparator<T>

Overrides:

equals in class BasicDataType<VersionedValue<T>>

hashCode

public int hashCode()

Overrides:

hashCode in class BasicDataType<VersionedValue<T>>

save

public void save(WriteBuffer buff,
                 MetaType<D> metaType)

Description copied from interface: StatefulDataType

Save the state.

Specified by:

save in interface StatefulDataType<T>

Parameters:

buff - the target buffer

metaType - the meta type

compare

public int compare(VersionedValue<T> a,
                   VersionedValue<T> b)

Description copied from interface: DataType

Compare two keys.

Specified by:

compare in interface java.util.Comparator<T>

Specified by:

compare in interface DataType<T>

Overrides:

compare in class BasicDataType<VersionedValue<T>>

Parameters:

a - the first key

b - the second key

Returns:

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

getFactory

public VersionedValueType.Factory<D> getFactory()

Specified by:

getFactory in interface StatefulDataType<T>