org.h2.mvstore.db

Class RowDataType

java.lang.Object

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

org.h2.mvstore.db.RowDataType

All Implemented Interfaces:

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

public final class RowDataType
extends BasicDataType<SearchRow>
implements StatefulDataType<Database>

The data type for rows.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RowDataType.Factory

Constructor Summary

Constructors

Constructor and Description
RowDataType(CastDataProvider provider, CompareMode compareMode, DataHandler handler, int[] sortTypes, int[] indexes, int columnCount, boolean storeKeys)

Method Summary

Modifier and Type	Method and Description
int	binarySearch(SearchRow key, java.lang.Object storage, int size, int initialGuess) Perform binary search for the key within the storage
int	binarySearch(SearchRow key, SearchRow[] keys, int size, int initialGuess)
int	compare(SearchRow a, SearchRow b) Compare two keys.
SearchRow[]	createStorage(int capacity) Create storage object of array type to hold values
boolean	equals(java.lang.Object obj)
int	getColumnCount()
RowDataType.Factory	getFactory()
int[]	getIndexes()
int	getMemory(SearchRow row) Calculates the amount of used memory in bytes.
RowFactory	getRowFactory()
int	hashCode()
boolean	isStoreKeys()
SearchRow	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, SearchRow row) Write an object.

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

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

comparing, comparing, comparingDouble, comparingInt, comparingLong, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

RowDataType

public RowDataType(CastDataProvider provider,
                   CompareMode compareMode,
                   DataHandler handler,
                   int[] sortTypes,
                   int[] indexes,
                   int columnCount,
                   boolean storeKeys)

Method Detail

getIndexes

public int[] getIndexes()

getRowFactory

public RowFactory getRowFactory()

setRowFactory

public void setRowFactory(RowFactory rowFactory)

getColumnCount

public int getColumnCount()

isStoreKeys

public boolean isStoreKeys()

createStorage

public SearchRow[] createStorage(int capacity)

Description copied from interface: DataType

Create storage object of array type to hold values

Specified by:

createStorage in interface DataType<SearchRow>

Parameters:

capacity - number of values to hold

Returns:

storage object

compare

public int compare(SearchRow a,
                   SearchRow b)

Description copied from interface: DataType

Compare two keys.

Specified by:

compare in interface java.util.Comparator<SearchRow>

Specified by:

compare in interface DataType<SearchRow>

Overrides:

compare in class BasicDataType<SearchRow>

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(SearchRow key,
                        java.lang.Object storage,
                        int size,
                        int initialGuess)

Description copied from interface: DataType

Perform binary search for the key within the storage

Specified by:

binarySearch in interface DataType<SearchRow>

Overrides:

binarySearch in class BasicDataType<SearchRow>

Parameters:

key - to search for

storage - 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

public int binarySearch(SearchRow key,
                        SearchRow[] keys,
                        int size,
                        int initialGuess)

getMemory

public int getMemory(SearchRow row)

Description copied from interface: DataType

Calculates the amount of used memory in bytes.

Specified by:

getMemory in interface DataType<SearchRow>

Specified by:

getMemory in class BasicDataType<SearchRow>

Parameters:

row - the object

Returns:

the used memory

read

public SearchRow read(java.nio.ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType<SearchRow>

Specified by:

read in class BasicDataType<SearchRow>

Parameters:

buff - the source buffer

Returns:

the object

write

public void write(WriteBuffer buff,
                  SearchRow row)

Description copied from interface: DataType

Write an object.

Specified by:

write in interface DataType<SearchRow>

Specified by:

write in class BasicDataType<SearchRow>

Parameters:

buff - the target buffer

row - the value

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface java.util.Comparator<SearchRow>

Overrides:

equals in class BasicDataType<SearchRow>

hashCode

public int hashCode()

Overrides:

hashCode in class BasicDataType<SearchRow>

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 RowDataType.Factory getFactory()

Specified by:

getFactory in interface StatefulDataType<Database>