org.dbxml.core.filer
Class MemFiler

java.lang.Object
  |
  +--org.dbxml.server.SimpleConfigurable
        |
        +--org.dbxml.core.filer.MemFiler

All Implemented Interfaces:

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

public final class MemFiler

extends org.dbxml.server.SimpleConfigurable

implements Filer

MemFiler is an In-Memory Filer implementation for dbXML. MemFiler can be used for temporary collections and caching. It's basically a layering on top of HashMap.

Constructor Summary

MemFiler()

MemFiler(java.util.Map hashTable)

MemFiler(java.util.Map hashTable, boolean readOnly)

Method Summary

boolean	close() close closes the DBObject
boolean	create() create creates a new DBObject and any associated resources for the new DBObject, such as disk files, etc.
boolean	deleteRecord(Key key) deleteRecord removes a Record from the Filer based on the specified Key.
boolean	drop() drop instructs the DBObjectimplementation to remove itself from existence.
boolean	exists() exists returns whether or not a physical representation of this DBObject actually exists.
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	isOpened() isOpened returns whether or not the DBObject is opened for business.
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.
boolean	writeRecord(Key key, Value value) writeRecord writes a Value to the Filer based on the specified Key.

Methods inherited from class org.dbxml.server.SimpleConfigurable

getConfig, setConfig

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.dbxml.server.Configurable

getConfig, setConfig

Constructor Detail

MemFiler

public MemFiler()

MemFiler

public MemFiler(java.util.Map hashTable,
                boolean readOnly)

MemFiler

public MemFiler(java.util.Map hashTable)

Method Detail

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

getName

public java.lang.String getName()

Specified by:

getName in interface org.dbxml.server.Named

create

public boolean create()

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

Specified by:

create in interface DBObject

Returns:

Whether or not the DBObject was created

open

public boolean open()

open opens the DBObject

Specified by:

open in interface DBObject

Returns:

Whether or not the DBObject was opened

isOpened

public boolean isOpened()

isOpened returns whether or not the DBObject is opened for business.

Specified by:

isOpened in interface DBObject

Returns:

The open status of the DBObject

exists

public boolean exists()

Description copied from interface: DBObject

exists returns whether or not a physical representation of this DBObject actually exists. In the case of a HashFiler, this would check for the file, and in the case of an FTPFiler, it might perform a connection check.

Specified by:

exists in interface DBObject

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

Returns:

Whether or not the physical resource exists

drop

public boolean drop()

drop instructs the DBObjectimplementation to remove itself from existence. The DBObject's parent is responsible for removing any references to the DBObject in its own context.

Specified by:

drop in interface DBObject

Returns:

Whether or not the DBObject was dropped

close

public boolean close()

close closes the DBObject

Specified by:

close in interface DBObject

Returns:

Whether or not the DBObject was closed

readRecord

public Record readRecord(Key key)
                  throws DBException

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

Specified by:

readRecord in interface Filer

Parameters:

key - The Record's Key

Returns:

The returned Record

writeRecord

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

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

Specified by:

writeRecord in interface 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

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

Specified by:

deleteRecord in interface Filer

Parameters:

key - The Record's Key

Returns:

Whether or not the Record was deleted

getRecordCount

public long getRecordCount()
                    throws DBException

getRecordCount returns the number of Records in the Filer.

Specified by:

getRecordCount in interface Filer

Returns:

The Record count

getRecordSet

public RecordSet getRecordSet()
                       throws DBException

getRecordSet returns a RecordSet object for the current Filer.

Specified by:

getRecordSet in interface Filer

Returns:

The Filer Enumerator