Class StringDataType

java.lang.Object

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

org.h2.mvstore.type.StringDataType

All Implemented Interfaces:

Comparator<String>, DataType<String>

public class StringDataType
extends BasicDataType<String>

A string type.

Field Summary

Fields

Modifier and Type	Field	Description
private static final String[]	EMPTY_STRING_ARR
static final StringDataType	INSTANCE

Constructor Summary

Constructors

Constructor	Description
StringDataType()

Method Summary

Modifier and Type	Method	Description
int	binarySearch(String key, Object storageObj, int size, int initialGuess)	Perform binary search for the key within the storage
int	compare(String a, String b)	Compare two keys.
String[]	createStorage(int size)	Create storage object of array type to hold values
int	getMemory(String obj)	Calculates the amount of used memory in bytes.
String	read(ByteBuffer buff)	Read an object.
void	write(WriteBuffer buff, String s)	Write an object.

Methods inherited from class BasicDataType

cast, equals, hashCode, isMemoryEstimationAllowed, 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

public static final StringDataType INSTANCE

EMPTY_STRING_ARR

private static final String[] EMPTY_STRING_ARR

Constructor Details

StringDataType

public StringDataType()

Method Details

createStorage

public String[] 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(String a,
 String b)

Description copied from interface: DataType

Compare two keys.

Specified by:

compare in interface Comparator<String>

Specified by:

compare in interface DataType<String>

Overrides:

compare in class BasicDataType<String>

Parameters:

a - the first key

b - the second key

Returns:

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

binarySearch

public int binarySearch(String key,
 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<String>

Overrides:

binarySearch in class BasicDataType<String>

Parameters:

key - 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

getMemory

public int getMemory(String obj)

Description copied from interface: DataType

Calculates the amount of used memory in bytes.

Specified by:

getMemory in interface DataType<String>

Specified by:

getMemory in class BasicDataType<String>

Parameters:

obj - the object

Returns:

the used memory

read

public String read(ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType<String>

Specified by:

read in class BasicDataType<String>

Parameters:

buff - the source buffer

Returns:

the object

write

public void write(WriteBuffer buff,
 String s)

Description copied from interface: DataType

Write an object.

Specified by:

write in interface DataType<String>

Specified by:

write in class BasicDataType<String>

Parameters:

buff - the target buffer

s - the value