org.h2.index
Class BtreePage

java.lang.Object
  org.h2.util.CacheObject
      org.h2.store.Record
          org.h2.index.BtreePage

Direct Known Subclasses:

BtreeLeaf, BtreeNode

public abstract class BtreePage
extends Record

An abstract b-tree page.

Field Summary

protected static int	BLOCKS_PER_PAGE The maximum number of blocks occupied by a b-tree page.
protected BtreeIndex	index The b-tree index object
protected ObjectArray<SearchRow>	pageData The list of data pages.
protected boolean	root If this is the root page of the index.

Fields inherited from class org.h2.util.CacheObject

blockCount, cacheQueue, chained, next, previous

Method Summary

int	getByteCount(DataPage dummy) Get the number of bytes required for the data if the given data page would be used.
boolean	isEmpty() Check if this record is empty.
boolean	isPinned() Check if this cache object can be removed from the cache.

Methods inherited from class org.h2.store.Record

canRemove, commit, getSessionId, getStorageId, isDeleted, isLogWritten, prepareWrite, setDeleted, setLastLog, setLogWritten, setSessionId, setStorageId, write

Methods inherited from class org.h2.util.CacheObject

getBlockCount, getMemorySize, getPos, isChanged, setBlockCount, setChanged, setPos, sort

Methods inherited from class java.lang.Object

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

Field Detail

BLOCKS_PER_PAGE

protected static final int BLOCKS_PER_PAGE

The maximum number of blocks occupied by a b-tree page.

See Also:

Constant Field Values

index

protected BtreeIndex index

The b-tree index object

pageData

protected ObjectArray<SearchRow> pageData

The list of data pages.

root

protected boolean root

If this is the root page of the index.

Method Detail

getByteCount

public int getByteCount(DataPage dummy)

Description copied from class: Record

Get the number of bytes required for the data if the given data page would be used.

Specified by:

getByteCount in class Record

Parameters:

dummy - the template data page

Returns:

the number of bytes

isEmpty

public boolean isEmpty()

Description copied from class: Record

Check if this record is empty.

Overrides:

isEmpty in class Record

Returns:

false

isPinned

public boolean isPinned()

Description copied from class: CacheObject

Check if this cache object can be removed from the cache.

Overrides:

isPinned in class CacheObject

Returns:

if it can be removed