Package org.h2.mvstore.type

Class LongDataType

java.lang.Object

org.h2.mvstore.type.BasicDataType<java.lang.Long>

org.h2.mvstore.type.LongDataType

All Implemented Interfaces:

java.util.Comparator<java.lang.Long>, DataType<java.lang.Long>

public class LongDataType
extends BasicDataType<java.lang.Long>

Class LongDataType.

• 8/21/17 6:52 PM initial creation

Field Summary

Fields

Modifier and Type	Field	Description
private static java.lang.Long[]	EMPTY_LONG_ARR
static LongDataType	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	LongDataType()

Method Summary

Modifier and Type	Method	Description
private static int	binarySearch(long key, java.lang.Long[] storage, int low, int high, int x)
int	binarySearch(java.lang.Long keyObj, java.lang.Object storageObj, int size, int initialGuess)	Perform binary search for the key within the storage
int	compare(java.lang.Long one, java.lang.Long two)	Compare two keys.
java.lang.Long[]	createStorage(int size)	Create storage object of array type to hold values
int	getMemory(java.lang.Long obj)	Calculates the amount of used memory in bytes.
java.lang.Long	read(java.nio.ByteBuffer buff)	Read an object.
void	write(WriteBuffer buff, java.lang.Long data)	Write an object.

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

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

Field Detail

INSTANCE

public static final LongDataType INSTANCE

EMPTY_LONG_ARR

private static final java.lang.Long[] EMPTY_LONG_ARR

Constructor Detail

LongDataType

private LongDataType()

Method Detail

getMemory

public int getMemory(java.lang.Long obj)

Description copied from interface: DataType

Calculates the amount of used memory in bytes.

Specified by:

getMemory in interface DataType<java.lang.Long>

Specified by:

getMemory in class BasicDataType<java.lang.Long>

Parameters:

obj - the object

Returns:

the used memory

write

public void write(WriteBuffer buff,
                  java.lang.Long data)

Description copied from interface: DataType

Write an object.

Specified by:

write in interface DataType<java.lang.Long>

Specified by:

write in class BasicDataType<java.lang.Long>

Parameters:

buff - the target buffer

data - the value

read

public java.lang.Long read(java.nio.ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType<java.lang.Long>

Specified by:

read in class BasicDataType<java.lang.Long>

Parameters:

buff - the source buffer

Returns:

the object

createStorage

public java.lang.Long[] 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

compare

public int compare(java.lang.Long one,
                   java.lang.Long two)

Description copied from interface: DataType

Compare two keys.

Specified by:

compare in interface java.util.Comparator<java.lang.Long>

Specified by:

compare in interface DataType<java.lang.Long>

Overrides:

compare in class BasicDataType<java.lang.Long>

Parameters:

one - the first key

two - the second key

Returns:

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

binarySearch

public int binarySearch(java.lang.Long keyObj,
                        java.lang.Object storageObj,
                        int size,
                        int initialGuess)

Description copied from interface: DataType

Perform binary search for the key within the storage

Specified by:

binarySearch in interface DataType<java.lang.Long>

Overrides:

binarySearch in class BasicDataType<java.lang.Long>

Parameters:

keyObj - to search for

storageObj - to search within (an array of type T)

size - number of data items in the storage

initialGuess - for key position

Returns:

index of the key , if found, - index of the insertion point, if not

binarySearch

private static int binarySearch(long key,
                                java.lang.Long[] storage,
                                int low,
                                int high,
                                int x)