jdbm.recman

Class TranslationPage

java.lang.Object

jdbm.recman.PageHeader

jdbm.recman.TranslationPage

All Implemented Interfaces:

BlockView

final class TranslationPage
extends PageHeader

Class describing a page that holds translations from physical rowids to logical rowids. In fact, the page just holds physical rowids - the page's block is the block for the logical rowid, the offset serve as offset for the rowids.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static short	ELEMS_PER_PAGE Number of PhysicalRowId in this page
(package private) static short	O_TRANS Offset of the PageHeader
(package private) PhysicalRowId[]	slots The table of PhysicalRowId

Fields inherited from class jdbm.recman.PageHeader

blockIo, SIZE

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
(package private) PhysicalRowId	get(short offset) Returns the value of the indicated rowid on the page
(package private) static TranslationPage	getTranslationPageView(BlockIo blockIo) Factory method to create or return a data page for the indicated block.
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_TRANS

static final short O_TRANS

Offset of the PageHeader

See Also:

Constant Field Values

ELEMS_PER_PAGE

static final short ELEMS_PER_PAGE

Number of PhysicalRowId in this page

See Also:

Constant Field Values

slots

final PhysicalRowId[] slots

The table of PhysicalRowId

Constructor Detail

TranslationPage

TranslationPage(BlockIo blockIo)

Constructs a data page view from the indicated block.

Method Detail

getTranslationPageView

static TranslationPage getTranslationPageView(BlockIo blockIo)

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

get

PhysicalRowId get(short offset)

Returns the value of the indicated rowid on the page

toString

public java.lang.String toString()

Overrides:

toString in class PageHeader