com.healthmarketscience.jackcess.impl

Class UsageMap

java.lang.Object

com.healthmarketscience.jackcess.impl.UsageMap

public class UsageMap
extends Object

Describes which database pages a particular table uses

Author:

Tim McCune

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	UsageMap.PageCursor Utility class to traverse over the pages in the UsageMap.

Field Summary

Fields

Modifier and Type	Field and Description
static byte	MAP_TYPE_INLINE Inline map type
static byte	MAP_TYPE_REFERENCE Reference map type, for maps that are too large to fit inline

Method Summary

Modifier and Type	Method and Description
void	addPageNumber(int pageNumber) Add a page number to this usage map
boolean	containsPageNumber(int pageNumber) Determines if the given page number is contained in this map.
UsageMap.PageCursor	cursor()
DatabaseImpl	getDatabase()
JetFormat	getFormat()
PageChannel	getPageChannel()
int	getPageCount()
static UsageMap	read(DatabaseImpl database, ByteBuffer buf)
void	removePageNumber(int pageNumber) Remove a page number from this usage map
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

MAP_TYPE_INLINE

public static final byte MAP_TYPE_INLINE

Inline map type

See Also:

Constant Field Values

MAP_TYPE_REFERENCE

public static final byte MAP_TYPE_REFERENCE

Reference map type, for maps that are too large to fit inline

See Also:

Constant Field Values

Method Detail

getDatabase

public DatabaseImpl getDatabase()

getFormat

public JetFormat getFormat()

getPageChannel

public PageChannel getPageChannel()

read

public static UsageMap read(DatabaseImpl database,
                            ByteBuffer buf)
                     throws IOException

Parameters:

database - database that contains this usage map

buf - buffer which contains the usage map row info

Returns:

Either an InlineUsageMap or a ReferenceUsageMap, depending on which type of map is found

Throws:

IOException

cursor

public UsageMap.PageCursor cursor()

getPageCount

public int getPageCount()

containsPageNumber

public boolean containsPageNumber(int pageNumber)

Determines if the given page number is contained in this map.

addPageNumber

public void addPageNumber(int pageNumber)
                   throws IOException

Add a page number to this usage map

Throws:

IOException

removePageNumber

public void removePageNumber(int pageNumber)
                      throws IOException

Remove a page number from this usage map

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object