Package org.aksw.commons.io.block.impl

Class PageManagerWrapper

java.lang.Object

org.aksw.commons.io.block.impl.PageManagerWrapper

All Implemented Interfaces:

BlockSource, PageManager

public class PageManagerWrapper
extends Object
implements PageManager

A wrapper that virtually puts a displaced page view over a delegate There must be a 1:1 correspondence between page and byte buffer. Hence, if a virtual page stretches over multiple physical ones, the data is copied into a buffer of sufficient size. view: displacement [ ] [ ] [ ] [ ] [ ] [ ] delegate: [ p1 ] [ p2 ] [ p3 ] [ p4 ]

Author:

raven

Field Summary

Fields

Modifier and Type	Field	Description
protected PageManager	delegate
protected long	displacement
protected int	virtPageSize

Constructor Summary

Constructors

Constructor	Description
PageManagerWrapper(PageManager delegate, long displacement, int pageSize)

Method Summary

Modifier and Type	Method	Description
long	getEndPos()	The maximum position in the underlying buffer
int	getPageSize()	The pageSize.
Ref<Page>	requestBufferForPage(long page)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.aksw.commons.io.block.api.PageManager

contentAtOrAfter, contentAtOrBefore, getSizeOfBlock, hasBlockAfter, hasBlockBefore, size

Field Details

delegate

protected PageManager delegate

displacement

protected long displacement

virtPageSize

protected int virtPageSize

Constructor Details

PageManagerWrapper

public PageManagerWrapper(PageManager delegate,
 long displacement,
 int pageSize)

Method Details

requestBufferForPage

public Ref<Page> requestBufferForPage(long page)

Specified by:

requestBufferForPage in interface PageManager

getPageSize

public int getPageSize()

Description copied from interface: PageManager

The pageSize. Must never change during the life time of a page manager.

Specified by:

getPageSize in interface PageManager

Returns:

getEndPos

public long getEndPos()

Description copied from interface: PageManager

The maximum position in the underlying buffer

Specified by:

getEndPos in interface PageManager

Returns: