jdbm.recman

Class FreePhysicalRowIdPage

java.lang.Object

jdbm.recman.PageHeader

jdbm.recman.FreePhysicalRowIdPage

All Implemented Interfaces:

BlockView

final class FreePhysicalRowIdPage
extends PageHeader

Class describing a page that holds physical rowids that were freed.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static short	ELEMS_PER_PAGE
private static short	O_COUNT
(package private) static short	O_FREE
(package private) FreePhysicalRowId[]	slots

Fields inherited from class jdbm.recman.PageHeader

blockIo, SIZE

Constructor Summary

Constructors

Constructor and Description
FreePhysicalRowIdPage(BlockIo block) Constructs a data page view from the indicated block.

Method Summary

Modifier and Type	Method and Description
(package private) FreePhysicalRowId	alloc(int slot) Allocates a slot
(package private) void	free(int slot) Frees a slot
(package private) FreePhysicalRowId	get(int slot) Returns the value of the indicated slot
(package private) short	getCount() Returns the number of free rowids
(package private) int	getFirstFree()
(package private) int	getFirstLargerThan(int size)
(package private) static FreePhysicalRowIdPage	getFreePhysicalRowIdPageView(BlockIo block) Factory method to create or return a data page for the indicated block.
(package private) boolean	isAllocated(int slot) Returns true if a slot is allocated
(package private) boolean	isFree(int slot) Returns true if a slot is free
private void	setCount(short i) Sets the number of free rowids
(package private) short	slotToOffset(int slot) Converts slot to offset
java.lang.String	toString()

Methods inherited from class jdbm.recman.PageHeader

getMagic, getNext, getPrev, getView, paranoiaMagicOk, setNext, setPrev, setType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

O_COUNT

private static final short O_COUNT

See Also:

Constant Field Values

O_FREE

static final short O_FREE

See Also:

Constant Field Values

ELEMS_PER_PAGE

static final short ELEMS_PER_PAGE

See Also:

Constant Field Values

slots

FreePhysicalRowId[] slots

Constructor Detail

FreePhysicalRowIdPage

FreePhysicalRowIdPage(BlockIo block)

Constructs a data page view from the indicated block.

Method Detail

getFreePhysicalRowIdPageView

static FreePhysicalRowIdPage getFreePhysicalRowIdPageView(BlockIo block)

Factory method to create or return a data page for the indicated block.

getCount

short getCount()

Returns the number of free rowids

setCount

private void setCount(short i)

Sets the number of free rowids

free

void free(int slot)

Frees a slot

alloc

FreePhysicalRowId alloc(int slot)

Allocates a slot

isAllocated

boolean isAllocated(int slot)

Returns true if a slot is allocated

isFree

boolean isFree(int slot)

Returns true if a slot is free

get

FreePhysicalRowId get(int slot)

Returns the value of the indicated slot

slotToOffset

short slotToOffset(int slot)

Converts slot to offset

getFirstFree

int getFirstFree()

Returns:

first free slot, -1 if no slots are available

getFirstLargerThan

int getFirstLargerThan(int size)

Returns:

first slot with available size >= indicated size, or -1 if no slots are available.

toString

public java.lang.String toString()

Overrides:

toString in class PageHeader