Package db

Class Database.DBBufferFileManager

java.lang.Object

db.Database.DBBufferFileManager

All Implemented Interfaces:

BufferFileManager

Enclosing class:

Database

protected class Database.DBBufferFileManager
extends Object
implements BufferFileManager

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DBBufferFileManager()

Method Summary

Modifier and Type	Method	Description
File	getBufferFile(int version)	Get the buffer file corresponding to a specified version.
File	getChangeDataFile(int version)	Get the change data buffer file corresponding to the specified version.
File	getChangeMapFile()	Returns the change map file corresponding to this DB if one is defined.
int	getCurrentVersion()	Returns the current version.
File	getVersionFile(int version)	Get the buffer version file corresponding to a specified version.
void	updateEnded(long checkinId)	Callback indicating that a buffer file update has ended without creating a new version.
void	versionCreated(int version, String comment, long checkinId)	Callback for when a buffer file is created.

Methods inherited from class java.lang.Object

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

Constructor Details

DBBufferFileManager

protected DBBufferFileManager()

Method Details

getCurrentVersion

public int getCurrentVersion()

Description copied from interface: BufferFileManager

Returns the current version. A value of 0 indicates that the first buffer file has not yet been created.

Specified by:

getCurrentVersion in interface BufferFileManager

getBufferFile

public File getBufferFile(int version)

Description copied from interface: BufferFileManager

Get the buffer file corresponding to a specified version.

Specified by:

getBufferFile in interface BufferFileManager

Returns:

database buffer file.

getVersionFile

public File getVersionFile(int version)

Description copied from interface: BufferFileManager

Get the buffer version file corresponding to a specified version. This file contains data corresponding to a specified buffer file version and those buffers which have been modified in the next version (version+1). May return null if version files not used.

Specified by:

getVersionFile in interface BufferFileManager

Parameters:

version - version of the original buffer file to be reconstructed

Returns:

buffer version file.

getChangeMapFile

public File getChangeMapFile()

Description copied from interface: BufferFileManager

Returns the change map file corresponding to this DB if one is defined. This file tracks all buffers which have been modified during a save operation.

Specified by:

getChangeMapFile in interface BufferFileManager

getChangeDataFile

public File getChangeDataFile(int version)

Description copied from interface: BufferFileManager

Get the change data buffer file corresponding to the specified version. This file contains application specific changes which were made going from the specified version to the next version (version+1). May return null if change data files are not used.

Specified by:

getChangeDataFile in interface BufferFileManager

Parameters:

version - version of the original buffer file which was changed

Returns:

change data buffer file.

versionCreated

public void versionCreated(int version,
 String comment,
 long checkinId)
                    throws FileNotFoundException

Description copied from interface: BufferFileManager

Callback for when a buffer file is created.

Specified by:

versionCreated in interface BufferFileManager

checkinId - associated checkinId

Throws:

FileNotFoundException - database files not found

updateEnded

public void updateEnded(long checkinId)

Description copied from interface: BufferFileManager

Callback indicating that a buffer file update has ended without creating a new version. This method terminates the checkin session.

Specified by:

updateEnded in interface BufferFileManager

Parameters:

checkinId - associated checkinId