jdbm.recman

Class DataPage

java.lang.Object

jdbm.recman.PageHeader

jdbm.recman.DataPage

All Implemented Interfaces:

BlockView

final class DataPage
extends PageHeader

Class describing a page that holds data.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static short	DATA_PER_PAGE total amount of data in this page/block: BLOCK_SIZE - 20 bytes
(package private) static short	O_DATA start of the data in this block: 20 byte offset
private static short	O_FIRST first short in the file after the page header info: 18 byte offset

Fields inherited from class jdbm.recman.PageHeader

blockIo, SIZE

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
(package private) static DataPage	getDataPageView(BlockIo blockIo) Factory method to create or return a data page for the indicated block.
(package private) short	getFirst()
(package private) void	setFirst(short value) Sets the first rowid's 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_FIRST

private static final short O_FIRST

first short in the file after the page header info: 18 byte offset

See Also:

Constant Field Values

O_DATA

static final short O_DATA

start of the data in this block: 20 byte offset

See Also:

Constant Field Values

DATA_PER_PAGE

static final short DATA_PER_PAGE

total amount of data in this page/block: BLOCK_SIZE - 20 bytes

See Also:

Constant Field Values

Constructor Detail

DataPage

DataPage(BlockIo block)

Constructs a data page view from the indicated block.

Method Detail

getDataPageView

static DataPage getDataPageView(BlockIo blockIo)

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

getFirst

short getFirst()

Returns:

the first rowid's offset

setFirst

void setFirst(short value)

Sets the first rowid's offset

toString

public java.lang.String toString()

Overrides:

toString in class PageHeader