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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
A Data Access Object (DAO) interface describing
the available operations for retrieving and storing User
s
(and their associated Subscription
s) in some persistence layer
whose characteristics are not specified here. One or more implementations
will be created to perform the actual I/O that is required.
Method Summary | |
void |
close()
Finalize access to the underlying persistence layer. |
User |
createUser(java.lang.String username)
Create and return a new User defined in this user database. |
User |
findUser(java.lang.String username)
Return the existing User with the specified username,
if any; otherwise return null . |
User[] |
findUsers()
Return the set of User s defined in this user database. |
void |
open()
Initiate access to the underlying persistence layer. |
void |
removeUser(User user)
Remove the specified User from this database. |
void |
save()
Save any pending changes to the underlying persistence layer. |
Method Detail |
public User createUser(java.lang.String username)
Create and return a new User
defined in this user database.
username
- Username of the new userjava.lang.IllegalArgumentException
- if the specified username
is not uniquepublic void close() throws java.lang.Exception
Finalize access to the underlying persistence layer.
java.lang.Exception
- if a database access error occurspublic User findUser(java.lang.String username) throws ExpiredPasswordException
Return the existing User
with the specified username,
if any; otherwise return null
.
username
- Username of the user to retrieveExpiredPasswordException
- if user password has expired
and must be changedpublic User[] findUsers()
Return the set of User
s defined in this user database.
public void open() throws java.lang.Exception
Initiate access to the underlying persistence layer.
java.lang.Exception
- if a database access error occurspublic void removeUser(User user)
User
from this database.user
- User to be removedjava.lang.IllegalArgumentException
- if the specified user is not
associated with this databasepublic void save() throws java.lang.Exception
Save any pending changes to the underlying persistence layer.
java.lang.Exception
- if a database access error occurs
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