|
db4o 7.4 | ||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
public interface Alias
Implement this interface when implementing special custom Aliases
for classes, packages or namespaces.
Aliases can be used to persist classes in the running
application to different persistent classes in a database file
or on a db4o server.
Two simple Alias implementations are supplied along with
db4o:
- TypeAlias
provides an #equals() resolver to match
names directly.
- WildcardAlias
allows simple pattern matching
with one single '*' wildcard character.
It is possible to create
own complex Alias
constructs by creating own resolvers
that implement the Alias
interface.
Four examples of concrete usecases:
// Creating an Alias for a single class
Db4o.configure().addAlias(
new TypeAlias("com.f1.Pilot", "com.f1.Driver"));
// Accessing a .NET assembly from a Java package
Db4o.configure().addAlias(
new WildcardAlias(
"Tutorial.F1.*, Tutorial",
"com.f1.*"));
// Mapping a Java package onto another
Db4o.configure().addAlias(
new WildcardAlias(
"com.f1.*",
"com.f1.client*"));
Aliases that translate the persistent name of a class to
a name that already exists as a persistent name in the database
(or on the server) are not permitted and will throw an exception
when the database file is opened.
Aliases should be configured before opening a database file
or connecting to a server.
Method Summary | |
---|---|
java.lang.String |
resolveRuntimeName(java.lang.String runtimeTypeName)
return the stored name for a runtime name or null if not handled. |
java.lang.String |
resolveStoredName(java.lang.String storedTypeName)
return the runtime name for a stored name or null if not handled. |
Method Detail |
---|
java.lang.String resolveRuntimeName(java.lang.String runtimeTypeName)
java.lang.String resolveStoredName(java.lang.String storedTypeName)
|
db4o 7.4 | ||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |