PageData

A page that contains data rows.

Methods
int	addRowTry(Row row) Add a row if possible.
int	addRowTry(Row row) Add a row if possible. If it is possible this method returns -1, otherwise the split point. It is always possible to add one row. Parameters: row - the now to add Returns: the split point of this page, or -1 if no split is required
boolean	canRemove()
boolean	canRemove()
int	find(long key) Find an entry by key.
int	find(long key) Find an entry by key. Parameters: key - the key (may not exist) Returns: the matching or next index
Cursor	find(Session session, long minKey, long maxKey, boolean multiVersion) Get a cursor.
Cursor	find(Session session, long minKey, long maxKey, boolean multiVersion) Get a cursor. Parameters: session - the session minKey - the smallest key maxKey - the largest key multiVersion - if the delta should be used Returns: the cursor
void	freeRecursive() Free this page and all child pages.
void	freeRecursive() Free this page and all child pages.
long	getDiskSpaceUsed() Get the used disk space for this index.
long	getDiskSpaceUsed() Get the used disk space for this index. Returns: the estimated number of bytes
PageDataLeaf	getFirstLeaf() Get the first child leaf page of a page.
PageDataLeaf	getFirstLeaf() Get the first child leaf page of a page. Returns: the page
long	getKey(int at) Get the key at this position.
long	getKey(int at) Get the key at this position. Parameters: at - the index Returns: the key
long	getLastKey() Get the last key of a page.
long	getLastKey() Get the last key of a page. Returns: the last key
int	getMemory() Get the estimated heap memory size.
int	getMemory() Get the estimated heap memory size. Returns: number of double words (4 bytes each)
int	getParentPageId()
int	getParentPageId()
int	getRowCount() Get the real row count.
int	getRowCount() Get the real row count. If required, this will read all child pages. Returns: the row count
Row	getRowWithKey(long key) Get the row for the given key.
Row	getRowWithKey(long key) Get the row for the given key. Parameters: key - the key Returns: the row
void	remapChildren(int old) Update the parent id of all children.
void	remapChildren(int old) Update the parent id of all children. Parameters: old - the previous position
boolean	remove(long key) Remove a row.
boolean	remove(long key) Remove a row. Parameters: key - the key of the row to remove Returns: true if this page is now empty
void	setPageId(int id) Change the page id.
void	setPageId(int id) Change the page id. Parameters: id - the new page id
void	setParentPageId(int id) Change the parent page id.
void	setParentPageId(int id) Change the parent page id. Parameters: id - the new parent page id
void	setRowCountStored(int rowCount) Set the stored row count.
void	setRowCountStored(int rowCount) Set the stored row count. This will write the page. Parameters: rowCount - the stored row count
PageData	split(int splitPoint) Split the index page at the given point.
PageData	split(int splitPoint) Split the index page at the given point. Parameters: splitPoint - the index where to split Returns: the new page that contains about half the entries

Fields
static int	ROOT = 0
static int	START_PARENT = 3
static int	UNKNOWN_ROWCOUNT = -1
static Data	data
static int	entryCount
static PageDataIndex	index
static long[]	keys
static int	parentPageId
static boolean	written

UNKNOWN_ROWCOUNT = -1

Indicator that the row count is not known.

ROOT = 0

This is a root page.

START_PARENT = 3

The position of the parent page id.

data

The data page.

entryCount

The number of entries.

index

The index.

keys

The row keys.

parentPageId

The page number of the parent.

written

Whether the data page is up-to-date.