com.db4o.defragment

Class InMemoryIdMapping

java.lang.Object

com.db4o.defragment.AbstractIdMapping

com.db4o.defragment.InMemoryIdMapping

All Implemented Interfaces:

IdMapping

public class InMemoryIdMapping
extends AbstractIdMapping

In-memory mapping for IDs during a defragmentation run. This is faster than the DatabaseIdMapping but it uses more memory. If you have OutOfMemory conditions with this id mapping, use the DatabaseIdMapping instead.

See Also:

Defragment

Constructor Summary

Constructors

Constructor and Description
InMemoryIdMapping()

Method Summary

Methods

Modifier and Type	Method and Description
int	addressForId(int id) returns the slot address for an ID
void	close() Shuts down the mapping after use.
void	commit()
void	mapId(int id, Slot slot) Maps an ID to a slot
protected void	mapNonClassIDs(int origID, int mappedID)
int	mappedId(int oldID) Returns a previously registered mapping ID for the given ID if it exists.
void	open() Prepares the mapping for use.
Visitable<SlotChange>	slotChanges() provides a Visitable of all mappings of IDs to slots.

Methods inherited from class com.db4o.defragment.AbstractIdMapping

mapId, mappedClassID

Methods inherited from class java.lang.Object

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

Constructor Detail

InMemoryIdMapping

public InMemoryIdMapping()

Method Detail

mappedId

public int mappedId(int oldID)

Description copied from interface: IdMapping

Returns a previously registered mapping ID for the given ID if it exists.

Returns:

The mapping ID for the given original ID or 0, if none has been registered.

open

public void open()

Description copied from interface: IdMapping

Prepares the mapping for use.

close

public void close()

Description copied from interface: IdMapping

Shuts down the mapping after use.

mapNonClassIDs

protected void mapNonClassIDs(int origID,
                  int mappedID)

Specified by:

mapNonClassIDs in class AbstractIdMapping

addressForId

public int addressForId(int id)

Description copied from interface: IdMapping

returns the slot address for an ID

mapId

public void mapId(int id,
         Slot slot)

Description copied from interface: IdMapping

Maps an ID to a slot

slotChanges

public Visitable<SlotChange> slotChanges()

Description copied from interface: IdMapping

provides a Visitable of all mappings of IDs to slots.

commit

public void commit()