jdbm.recman

Class PageCursor

java.lang.Object

jdbm.recman.PageCursor

final class PageCursor
extends java.lang.Object

This class provides a cursor that can follow lists of pages bi-directionally.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) long	blockId The current block ID
(package private) PageManager	pageManager The PageManager
(package private) short	type The page type

Constructor Summary

Constructors

Constructor and Description
PageCursor(PageManager pageManager, long blockId) Constructs a page cursor that starts at the indicated block.
PageCursor(PageManager pageManager, short type) Constructs a page cursor that starts at the first block of the indicated list.

Method Summary

Modifier and Type	Method and Description
(package private) long	getBlockId()
(package private) long	next()
(package private) long	prev()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

pageManager

PageManager pageManager

The PageManager

blockId

long blockId

The current block ID

type

short type

The page type

Constructor Detail

PageCursor

PageCursor(PageManager pageManager,
           long blockId)

Constructs a page cursor that starts at the indicated block.

Parameters:

pageManager - The PageManager

PageCursor

PageCursor(PageManager pageManager,
           short type)
    throws java.io.IOException

Constructs a page cursor that starts at the first block of the indicated list.

Parameters:

pageManager - The PageManager

type - The page type

Throws:

java.io.IOException

Method Detail

getBlockId

long getBlockId()
         throws java.io.IOException

Returns:

the BlockId

Throws:

java.io.IOException

next

long next()
   throws java.io.IOException

Returns:

the next blockId

Throws:

java.io.IOException

prev

long prev()
   throws java.io.IOException

Returns:

the previous blockId

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object