org.dbxml.core.filer
Class HashFiler

java.lang.Object
  |
  +--org.dbxml.core.filer.Paged
        |
        +--org.dbxml.core.filer.HashFiler

All Implemented Interfaces:

org.dbxml.server.Configurable, DBObject, Filer, org.dbxml.server.Named

public final class HashFiler

extends Paged

implements org.dbxml.server.Configurable, Filer

HashFiler is a Filer implementation based on the Paged class. By extending Paged, HashFiler inherits the ability to maintain Record metadata such as creation and modification time. It also provides quite a bit more flexibility in its ability to retreive blocks of data and allocate Record space.

NOTE: This class has been temporarily (maybe indefinitely) deprecated by BTreeFiler.

Inner classes inherited from class org.dbxml.core.filer.Paged

Paged.FileHeader, Paged.Page, Paged.PageHeader

Constructor Summary

HashFiler()

Method Summary

boolean	create() create creates a new DBObject and any associated resources for the new DBObject, such as disk files, etc.
Paged.FileHeader	createFileHeader() createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.
Paged.FileHeader	createFileHeader(boolean read) createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.
Paged.FileHeader	createFileHeader(long pageCount) createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.
Paged.FileHeader	createFileHeader(long pageCount, int pageSize) createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.
Paged.PageHeader	createPageHeader() createPageHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a PageHeader.
boolean	deleteRecord(Key key) deleteRecord removes a Record from the Filer based on the specified Key.
org.dbxml.server.Configuration	getConfig()
java.lang.String	getName()
long	getRecordCount() getRecordCount returns the number of Records in the Filer.
RecordSet	getRecordSet() getRecordSet returns a RecordSet object for the current Filer.
boolean	open() open opens the DBObject
Record	readRecord(Key key) readRecord returns a Record from the Filer based on the specified Key.
void	setCollection(Collection collection) setCollection tells the Filer who its parent is.
void	setConfig(org.dbxml.server.Configuration config)
void	setLocation(java.lang.String location)
boolean	writeRecord(Key key, Value value) writeRecord writes a Value to the Filer based on the specified Key.

Methods inherited from class org.dbxml.core.filer.Paged

close, deleteArrayInt, deleteArrayLong, deleteArrayShort, deleteArrayValue, drop, exists, getFileHeader, insertArrayInt, insertArrayLong, insertArrayShort, insertArrayValue, isOpened

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.dbxml.core.DBObject

close, drop, exists, isOpened

Constructor Detail

HashFiler

public HashFiler()

Method Detail

setConfig

public void setConfig(org.dbxml.server.Configuration config)

Specified by:

setConfig in interface org.dbxml.server.Configurable

getConfig

public org.dbxml.server.Configuration getConfig()

Specified by:

getConfig in interface org.dbxml.server.Configurable

setLocation

public void setLocation(java.lang.String location)

getName

public java.lang.String getName()

Specified by:

getName in interface org.dbxml.server.Named

open

public boolean open()
             throws DBException

Description copied from interface: DBObject

open opens the DBObject

Specified by:

open in interface DBObject

Overrides:

open in class Paged

Following copied from interface: org.dbxml.core.DBObject

Returns:

Whether or not the DBObject was opened

create

public boolean create()
               throws DBException

Description copied from interface: DBObject

create creates a new DBObject and any associated resources for the new DBObject, such as disk files, etc.

Specified by:

create in interface DBObject

Overrides:

create in class Paged

Following copied from interface: org.dbxml.core.DBObject

Returns:

Whether or not the DBObject was created

setCollection

public void setCollection(Collection collection)

Description copied from interface: Filer

setCollection tells the Filer who its parent is.

Specified by:

setCollection in interface Filer

Following copied from interface: org.dbxml.core.filer.Filer

Parameters:

collection - The owner Collection

readRecord

public Record readRecord(Key key)
                  throws DBException

Description copied from interface: Filer

readRecord returns a Record from the Filer based on the specified Key.

Specified by:

readRecord in interface Filer

Following copied from interface: org.dbxml.core.filer.Filer

Parameters:

key - The Record's Key

Returns:

The returned Record

writeRecord

public boolean writeRecord(Key key,
                           Value value)
                    throws DBException

Description copied from interface: Filer

writeRecord writes a Value to the Filer based on the specified Key.

Specified by:

writeRecord in interface Filer

Following copied from interface: org.dbxml.core.filer.Filer

Parameters:

key - The Record's Key

value - The Record's Value

Returns:

Whether or not the Record could be written

deleteRecord

public boolean deleteRecord(Key key)
                     throws DBException

Description copied from interface: Filer

deleteRecord removes a Record from the Filer based on the specified Key.

Specified by:

deleteRecord in interface Filer

Following copied from interface: org.dbxml.core.filer.Filer

Parameters:

key - The Record's Key

Returns:

Whether or not the Record was deleted

getRecordCount

public long getRecordCount()
                    throws DBException

Description copied from interface: Filer

getRecordCount returns the number of Records in the Filer.

Specified by:

getRecordCount in interface Filer

Following copied from interface: org.dbxml.core.filer.Filer

Returns:

The Record count

getRecordSet

public RecordSet getRecordSet()
                       throws DBException

Description copied from interface: Filer

getRecordSet returns a RecordSet object for the current Filer.

Specified by:

getRecordSet in interface Filer

Following copied from interface: org.dbxml.core.filer.Filer

Returns:

The Filer Enumerator

createFileHeader

public Paged.FileHeader createFileHeader()

Description copied from class: Paged

createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.

Overrides:

createFileHeader in class Paged

Following copied from class: org.dbxml.core.filer.Paged

Returns:

a new FileHeader

createFileHeader

public Paged.FileHeader createFileHeader(boolean read)
                                  throws java.io.IOException

Description copied from class: Paged

createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.

Overrides:

createFileHeader in class Paged

Following copied from class: org.dbxml.core.filer.Paged

Parameters:

read - If true, reads the FileHeader from disk

Returns:

a new FileHeader

Throws:

java.io.IOException - if an exception occurs

createFileHeader

public Paged.FileHeader createFileHeader(long pageCount)

Description copied from class: Paged

createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.

Overrides:

createFileHeader in class Paged

Following copied from class: org.dbxml.core.filer.Paged

Parameters:

pageCount - The number of pages to allocate for primary storage

Returns:

a new FileHeader

createFileHeader

public Paged.FileHeader createFileHeader(long pageCount,
                                         int pageSize)

Description copied from class: Paged

createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.

Overrides:

createFileHeader in class Paged

Following copied from class: org.dbxml.core.filer.Paged

Parameters:

pageCount - The number of pages to allocate for primary storage

pageSize - The size of a Page (should be a multiple of a FS block)

Returns:

a new FileHeader

createPageHeader

public Paged.PageHeader createPageHeader()

Description copied from class: Paged

createPageHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a PageHeader.

Overrides:

createPageHeader in class Paged

Following copied from class: org.dbxml.core.filer.Paged

Returns:

a new PageHeader