javax.jdo

Interface AttributeConverter<A,D>

Type Parameters:

A - The type of persistent attribute (field or property).

D - The type to be used in the datastore.

All Known Implementing Classes:

AttributeConverter.UseDefault

public interface AttributeConverter<A,D>

Converts persistent attribute values (fields or properties) to different values stored in the underlying datastore and vice versa. [TBD:

• should we require that converters need access to any other information, e.g metadata? passed into the constructor
• otherwise we assume there is a default constructor, and is instantiable using the current JDO class loader(s)

]

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	AttributeConverter.UseDefault Dummy converter to represent "use the implementation default for this type" when using annotations.

Method Summary

Modifier and Type	Method and Description
A	convertToAttribute(D datastoreValue) Converts the given datastore value to its representation as a persistent attribute.
D	convertToDatastore(A attributeValue) Converts the given persistent attribute value to its representation in the datastore.

Method Detail

convertToDatastore

D convertToDatastore(A attributeValue)

Converts the given persistent attribute value to its representation in the datastore.

Parameters:

attributeValue - Value of attribute

Returns:

Value in datastore

convertToAttribute

A convertToAttribute(D datastoreValue)

Converts the given datastore value to its representation as a persistent attribute.

Parameters:

datastoreValue - Value in datastore

Returns:

Value in attribute