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

(package private) long	current
(package private) PageManager	pageman
(package private) short	type

Constructor Summary

(package private)	PageCursor(PageManager pageman, long current) Constructs a page cursor that starts at the indicated block.
(package private)	PageCursor(PageManager pageman, short type) Constructs a page cursor that starts at the first block of the indicated list.

Method Summary

(package private) long	getCurrent() Returns the current value of the cursor.
(package private) long	next() Returns the next value of the cursor
(package private) long	prev() Returns the previous value of the cursor

Methods inherited from class java.lang.Object

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

Field Detail

pageman

PageManager pageman

current

long current

type

short type

Constructor Detail

PageCursor

PageCursor(PageManager pageman,
           long current)

Constructs a page cursor that starts at the indicated block.

PageCursor

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

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

Method Detail

getCurrent

long getCurrent()
          throws java.io.IOException

Returns the current value of the cursor.

Throws:

java.io.IOException

next

long next()
    throws java.io.IOException

Returns the next value of the cursor

Throws:

java.io.IOException

prev

long prev()
    throws java.io.IOException

Returns the previous value of the cursor

Throws:

java.io.IOException