com.db4o.config

Interface ObjectTranslator

All Known Subinterfaces:

ObjectConstructor

All Known Implementing Classes:

TClass, TCollection, THashtable, TMap, TNull, TSerializable, TTransient, TTreeMap, TTreeSet, TVector

public interface ObjectTranslator

translator interface to translate objects on storage and activation.

By writing classes that implement this interface, it is possible to define how application classes are to be converted to be stored more efficiently.

Before starting a db4o session, translator classes need to be registered. An example:
ObjectClass oc = config.objectClass("package.className");
oc.translate(new FooTranslator());

Method Summary

Methods

Modifier and Type	Method and Description
void	onActivate(ObjectContainer container, java.lang.Object applicationObject, java.lang.Object storedObject) db4o calls this method during activation.
java.lang.Object	onStore(ObjectContainer container, java.lang.Object applicationObject) db4o calls this method during storage and query evaluation.
java.lang.Class	storedClass() return the Class you are converting to.

Method Detail

onStore

java.lang.Object onStore(ObjectContainer container,
                       java.lang.Object applicationObject)

db4o calls this method during storage and query evaluation.

Parameters:

container - the ObjectContainer used

applicationObject - the Object to be translated

Returns:

return the object to store.
It needs to be of the class storedClass().

onActivate

void onActivate(ObjectContainer container,
              java.lang.Object applicationObject,
              java.lang.Object storedObject)

db4o calls this method during activation.

Parameters:

container - the ObjectContainer used

applicationObject - the object to set the members on

storedObject - the object that was stored

storedClass

java.lang.Class storedClass()

return the Class you are converting to.

Returns:

the Class of the object you are returning with the method onStore(ObjectContainer, Object)