net.sf.joafip.kvstore.entity

Class NullFileStorable

java.lang.Object

net.sf.joafip.kvstore.entity.NullFileStorable

All Implemented Interfaces:

IFileStorable

public final class NullFileStorable
extends Object
implements IFileStorable

Author:

luc peuvrier

Method Summary

Methods

Modifier and Type	Method and Description
void	clear() initial state:no value to save since not read and not write
boolean	equals(Object obj)
static NullFileStorable	getInstance()
long	getPositionInFile()
long	getPreviousRecordPositionInFile()
int	getRecordSize() get the record size
int	hashCode()
boolean	isJustCreated()
boolean	isValueChangedToSave() to know if the value state change
void	readFromFile() read this file storable from file
void	setValueIsChangedValueToSave() set this record have value changed, so to save
void	setValueIsNotChanged()
void	writeToFile() write this file storable to file
byte[]	writeToFileGetWrited()

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static NullFileStorable getInstance()

getPositionInFile

public long getPositionInFile()

Specified by:

getPositionInFile in interface IFileStorable

Returns:

position in file of this file storable

getPreviousRecordPositionInFile

public long getPreviousRecordPositionInFile()
                                     throws HeapException

Specified by:

getPreviousRecordPositionInFile in interface IFileStorable

Returns:

previous record position in file, -1 if no previous record (this is the first)

Throws:

HeapException

writeToFile

public void writeToFile()
                 throws HeapException

Description copied from interface: IFileStorable

write this file storable to file

Specified by:

writeToFile in interface IFileStorable

Throws:

HeapException

writeToFileGetWrited

public byte[] writeToFileGetWrited()
                            throws HeapException

Specified by:

writeToFileGetWrited in interface IFileStorable

Throws:

HeapException

readFromFile

public void readFromFile()
                  throws HeapException

Description copied from interface: IFileStorable

read this file storable from file

Specified by:

readFromFile in interface IFileStorable

Throws:

HeapException

clear

public void clear()

Description copied from interface: IFileStorable

initial state:no value to save since not read and not write

Specified by:

clear in interface IFileStorable

setValueIsChangedValueToSave

public void setValueIsChangedValueToSave()
                                  throws HeapException

Description copied from interface: IFileStorable

set this record have value changed, so to save

Specified by:

setValueIsChangedValueToSave in interface IFileStorable

Throws:

HeapException

setValueIsNotChanged

public void setValueIsNotChanged()

Specified by:

setValueIsNotChanged in interface IFileStorable

isValueChangedToSave

public boolean isValueChangedToSave()

Description copied from interface: IFileStorable

to know if the value state change

Specified by:

isValueChangedToSave in interface IFileStorable

Returns:

true if value changed

isJustCreated

public boolean isJustCreated()

Specified by:

isJustCreated in interface IFileStorable

Returns:

true if just created ( not read from file and not setted )

getRecordSize

public int getRecordSize()
                  throws HeapException

Description copied from interface: IFileStorable

get the record size

Specified by:

getRecordSize in interface IFileStorable

Returns:

the record size

Throws:

HeapException

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object