This interface permits to the user to convert a value store a support into
the value used in its persistent object. For example you can store a Date
value as a long in your data support and view this value as a java.util.Date
in youur application. It is the role of the persistent object provider to
implement this interface for each field which the type does not match to the
type into the data support. This converter can be only used for primitive
type, ie the memory type cannot be a reference to a persistent object.
author: S.Chassande-Barrioz
toMemory(Object storagevalue) Converts a value from the data support into a value in memory
Parameters: storagevalue - is the value store in the support (can be null).
toStorage(Object memoryvalue) Converts a value from the data support into a value in memory
Parameters: memoryvalue - the value in memory (can be null).
Converts a value from the data support into a value in memory
Parameters: storagevalue - is the value store in the support (can be null). the value in memory (can be null).
Converts a value from the data support into a value in memory
Parameters: memoryvalue - the value in memory (can be null). is the value store in the support (can be null).