com.db4o.defragment

Interface IdMapping

All Known Implementing Classes:

AbstractIdMapping, DatabaseIdMapping, InMemoryIdMapping

public interface IdMapping

The ID mapping used internally during a defragmentation run.

See Also:

Defragment

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 origId, int mappedId, boolean isClassId) Registers a mapping for the given IDs.
void	mapId(int id, Slot slot) Maps an ID to a slot
int	mappedId(int origId) 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.

Method Detail

mappedId

int mappedId(int origId)

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

Parameters:

origID - The original ID

Returns:

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

mapId

void mapId(int origId,
         int mappedId,
         boolean isClassId)

Registers a mapping for the given IDs.

Parameters:

origID - The original ID

mappedID - The ID to be mapped to the original ID.

isClassID - true if the given original ID specifies a class slot, false otherwise.

mapId

void mapId(int id,
         Slot slot)

Maps an ID to a slot

Parameters:

id -

slot -

slotChanges

Visitable<SlotChange> slotChanges()

provides a Visitable of all mappings of IDs to slots.

open

void open()
          throws java.io.IOException

Prepares the mapping for use.

Throws:

java.io.IOException

close

void close()

Shuts down the mapping after use.

addressForId

int addressForId(int id)

returns the slot address for an ID

commit

void commit()