org.h2.index

Class PageBtreeLeaf

java.lang.Object

org.h2.util.CacheObject

org.h2.store.Page

org.h2.index.PageBtree

org.h2.index.PageBtreeLeaf

All Implemented Interfaces:

java.lang.Comparable<CacheObject>

public class PageBtreeLeaf
extends PageBtree

A b-tree leaf page that contains index data. Format:

• page type: byte
• checksum: short
• parent page id (0 for root): int
• index id: varInt
• entry count: short
• list of offsets: short
• data (key: varLong, value,...)

Field Summary

Fields inherited from class org.h2.index.PageBtree

data, entryCount, index, offsets, onlyPosition, parentPageId, rows, start, written

Fields inherited from class org.h2.store.Page

changeCount, FLAG_LAST, TYPE_BTREE_LEAF, TYPE_BTREE_NODE, TYPE_DATA_LEAF, TYPE_DATA_NODE, TYPE_DATA_OVERFLOW, TYPE_EMPTY, TYPE_FREE_LIST, TYPE_STREAM_DATA, TYPE_STREAM_TRUNK

Fields inherited from class org.h2.util.CacheObject

cacheChained, cacheNext, cachePrevious

Method Summary

Modifier and Type	Method and Description
protected void	memoryChange() The memory usage of this page was changed.
void	moveTo(Session session, int newPos) Copy the data to a new location, change the parent to point to the new location, and free up the current page.
static Page	read(PageBtreeIndex index, Data data, int pageId) Read a b-tree leaf page.
java.lang.String	toString()
void	write() Write the page.

Methods inherited from class org.h2.index.PageBtree

canRemove, getMemory, readAllRows

Methods inherited from class org.h2.store.Page

add, canMove, insert, insert, insert, remove, remove, remove

Methods inherited from class org.h2.util.CacheObject

compareTo, getPos, isChanged, isStream, setChanged, setPos

Methods inherited from class java.lang.Object

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

Method Detail

read

public static Page read(PageBtreeIndex index,
                        Data data,
                        int pageId)

Read a b-tree leaf page.

Parameters:

index - the index

data - the data

pageId - the page id

Returns:

the page

write

public void write()

Description copied from class: Page

Write the page.

Specified by:

write in class Page

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

moveTo

public void moveTo(Session session,
                   int newPos)

Description copied from class: Page

Copy the data to a new location, change the parent to point to the new location, and free up the current page.

Specified by:

moveTo in class Page

Parameters:

session - the session

newPos - the new position

memoryChange

protected void memoryChange()

Description copied from class: PageBtree

The memory usage of this page was changed. Propagate the change if needed.

Overrides:

memoryChange in class PageBtree