com.healthmarketscience.jackcess.impl

Class UsageMap.ReferenceHandler

java.lang.Object

com.healthmarketscience.jackcess.impl.UsageMap.Handler

com.healthmarketscience.jackcess.impl.UsageMap.ReferenceHandler

Enclosing class:

UsageMap

private class UsageMap.ReferenceHandler
extends UsageMap.Handler

Usage map whose map is written across one or more entire separate pages of page type USAGE_MAP. For Jet4, this type of map can contain 32736 pages per reference page, and a maximum of 17 reference map pages for a total maximum of 556512 pages (2 GB).

Field Summary

Fields

Modifier and Type	Field and Description
private TempPageHolder	_mapPageHolder Buffer that contains the current reference map page

Constructor Summary

Constructors

Modifier	Constructor and Description
private	ReferenceHandler()

Method Summary

Modifier and Type	Method and Description
void	addOrRemovePageNumber(int pageNumber, boolean add, boolean force)
private int	calculateMapPagePointerOffset(int pageIndex)
private java.nio.ByteBuffer	createNewUsageMapPage(int pageIndex) Create a new usage map page and update the map declaration with a pointer to it.
private int	getMaxPagesPerUsagePage()

Methods inherited from class com.healthmarketscience.jackcess.impl.UsageMap.Handler

containsPageNumber

Methods inherited from class java.lang.Object

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

Field Detail

_mapPageHolder

private final TempPageHolder _mapPageHolder

Buffer that contains the current reference map page

Constructor Detail

ReferenceHandler

private ReferenceHandler()
                  throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getMaxPagesPerUsagePage

private int getMaxPagesPerUsagePage()

addOrRemovePageNumber

public void addOrRemovePageNumber(int pageNumber,
                                  boolean add,
                                  boolean force)
                           throws java.io.IOException

Specified by:

addOrRemovePageNumber in class UsageMap.Handler

Parameters:

pageNumber - Page number to add or remove from this map

add - True to add it, false to remove it

force - true to force add/remove and ignore certain inconsistencies

Throws:

java.io.IOException

createNewUsageMapPage

private java.nio.ByteBuffer createNewUsageMapPage(int pageIndex)
                                           throws java.io.IOException

Create a new usage map page and update the map declaration with a pointer to it.

Parameters:

pageIndex - Index of the page reference within the map declaration

Throws:

java.io.IOException

calculateMapPagePointerOffset

private int calculateMapPagePointerOffset(int pageIndex)