org.netbeans.mdr.persistence.btreeimpl.btreeindex

Interface BtreePageSource

All Superinterfaces:

MofidGenerator

All Known Implementing Classes:

BtreeCacheSource, BtreeFileSource, BtreeMDRSource

public interface BtreePageSource
extends MofidGenerator

Source of pages for a Btree.

Version:

1.0

Author:

Dana Bergen

Method Summary

Methods

Modifier and Type	Method and Description
void	dirtyPage(BtreePage page) Notify the BtreePageSource that the caller is going to modify this page.
BtreePage	getPage(byte[] pageId, Btree btree) Retrieve a page.
EntryTypeInfo	getPageIdInfo() Get an EntryTypeInfo for the datatype of this BtreePageSource's page IDs.
int	getPageIdLength() Returns the length of a page ID.
int	getPageSize() Returns the size of a page.
BtreePage	getRootPage(Btree btree) Retrieve the root page for this btree.
BtreeStorage	getStorage()
boolean	isNoPage(byte[] pageId) Test whether the passed-in pageId is equal to the null page ID.
BigKeyPage	newBigKeyPage(Btree btree) Creates a new oversize-key page and returns it.
BtreePage	newPage(Btree btree) Creates a new page and returns it.
void	setNoPage(byte[] pageId) Fills in the provided buffer with a value that represents a null page ID.
void	unpinPage(BigKeyPage page) Notify the BtreePageSource that the caller is done using this page.
void	unpinPage(BtreePage page) Notify the BtreePageSource that the caller is done using this page.

Methods inherited from interface org.netbeans.mdr.persistence.btreeimpl.btreeindex.MofidGenerator

getMofidPrefix, getNextMofid

Method Detail

getPageIdInfo

EntryTypeInfo getPageIdInfo()

Get an EntryTypeInfo for the datatype of this BtreePageSource's page IDs.

getPage

BtreePage getPage(byte[] pageId,
                Btree btree)
                  throws StorageException

Retrieve a page.

Parameters:

pageId - byte array buffer containing pageId

btree - btree to which the page belongs

Returns:

the BtreePage

Throws:

StorageException

newPage

BtreePage newPage(Btree btree)
                  throws StorageException

Creates a new page and returns it.

Parameters:

btree - btree to which the page belongs

Returns:

the BtreePage

Throws:

StorageException

newBigKeyPage

BigKeyPage newBigKeyPage(Btree btree)
                         throws StorageException

Creates a new oversize-key page and returns it.

Parameters:

btree - btree to which the page belongs

Returns:

the BigKeyPage

Throws:

StorageException

getRootPage

BtreePage getRootPage(Btree btree)
                      throws StorageException

Retrieve the root page for this btree.

Parameters:

btree - Btree

Returns:

the root BtreePage

Throws:

StorageException

unpinPage

void unpinPage(BtreePage page)

Notify the BtreePageSource that the caller is done using this page.

Parameters:

page - BtreePage

unpinPage

void unpinPage(BigKeyPage page)
               throws StorageException

Notify the BtreePageSource that the caller is done using this page.

Parameters:

page - BigKeyPage

Throws:

StorageException

dirtyPage

void dirtyPage(BtreePage page)
               throws StorageException

Notify the BtreePageSource that the caller is going to modify this page.

Parameters:

page - BtreePage

Throws:

StorageException

setNoPage

void setNoPage(byte[] pageId)

Fills in the provided buffer with a value that represents a null page ID.

Parameters:

pageId - byte array to be filled in

isNoPage

boolean isNoPage(byte[] pageId)

Test whether the passed-in pageId is equal to the null page ID.

Returns:

true if the pageId is the null page ID, otherwise false

getPageIdLength

int getPageIdLength()

Returns the length of a page ID.

Returns:

length of a page ID from this BtreePageSource

getPageSize

int getPageSize()

Returns the size of a page.

Returns:

size of a page from this BtreePageSource

getStorage

BtreeStorage getStorage()