Package org.h2.mvstore.db

Class ValueDataType

java.lang.Object

org.h2.mvstore.type.BasicDataType<Value>

org.h2.mvstore.db.ValueDataType

All Implemented Interfaces:

java.util.Comparator<Value>, DataType<Value>, StatefulDataType<Database>

public final class ValueDataType
extends BasicDataType<Value>
implements StatefulDataType<Database>

A row type.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ValueDataType.Factory

Constructor Summary

Constructors

Constructor	Description
ValueDataType()
ValueDataType(CastDataProvider provider, CompareMode compareMode, DataHandler handler, int[] sortTypes)
ValueDataType(Database database, int[] sortTypes)

Method Summary

Modifier and Type	Method	Description
int	compare(Value a, Value b)	Compare two keys.
int	compareValues(Value a, Value b, int sortType)	Compares the specified values.
Value[]	createStorage(int size)	Create storage object of array type to hold values
boolean	equals(java.lang.Object obj)
ValueDataType.Factory	getFactory()
int	getMemory(Value v)	Calculates the amount of used memory in bytes.
RowFactory	getRowFactory()
int	hashCode()
Value	read(java.nio.ByteBuffer buff)	Read an object.
void	save(WriteBuffer buff, MetaType<Database> metaType)	Save the state.
void	setRowFactory(RowFactory rowFactory)
void	write(WriteBuffer buff, Value v)	Write an object.
static void	writeLong(WriteBuffer buff, long x)	Writes a long.

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

binarySearch, cast, 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 Detail

ValueDataType

public ValueDataType()

ValueDataType

public ValueDataType(Database database,
                     int[] sortTypes)

ValueDataType

public ValueDataType(CastDataProvider provider,
                     CompareMode compareMode,
                     DataHandler handler,
                     int[] sortTypes)

Method Detail

getRowFactory

public RowFactory getRowFactory()

setRowFactory

public void setRowFactory(RowFactory rowFactory)

createStorage

public Value[] createStorage(int size)

Description copied from interface: DataType

Create storage object of array type to hold values

Specified by:

createStorage in interface DataType<Value>

Parameters:

size - number of values to hold

Returns:

storage object

compare

public int compare(Value a,
                   Value b)

Description copied from interface: DataType

Compare two keys.

Specified by:

compare in interface java.util.Comparator<Value>

Specified by:

compare in interface DataType<Value>

Overrides:

compare in class BasicDataType<Value>

Parameters:

a - the first key

b - the second key

Returns:

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

compareValues

public int compareValues(Value a,
                         Value b,
                         int sortType)

Compares the specified values.

Parameters:

a - the first value

b - the second value

sortType - the sorting type

Returns:

0 if equal, -1 if first value is smaller for ascending or larger for descending sort type, 1 otherwise

getMemory

public int getMemory(Value v)

Description copied from interface: DataType

Calculates the amount of used memory in bytes.

Specified by:

getMemory in interface DataType<Value>

Specified by:

getMemory in class BasicDataType<Value>

Parameters:

v - the object

Returns:

the used memory

read

public Value read(java.nio.ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType<Value>

Specified by:

read in class BasicDataType<Value>

Parameters:

buff - the source buffer

Returns:

the object

write

public void write(WriteBuffer buff,
                  Value v)

Description copied from interface: DataType

Write an object.

Specified by:

write in interface DataType<Value>

Specified by:

write in class BasicDataType<Value>

Parameters:

buff - the target buffer

v - the value

writeLong

public static void writeLong(WriteBuffer buff,
                             long x)

Writes a long.

Parameters:

buff - the target buffer

x - the long value

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface java.util.Comparator<Value>

Overrides:

equals in class BasicDataType<Value>

hashCode

public int hashCode()

Overrides:

hashCode in class BasicDataType<Value>

save

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

Description copied from interface: StatefulDataType

Save the state.

Specified by:

save in interface StatefulDataType<Database>

Parameters:

buff - the target buffer

metaType - the meta type

getFactory

public ValueDataType.Factory getFactory()

Specified by:

getFactory in interface StatefulDataType<Database>