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java.lang.Objectorg.apache.struts.webapp.example2.memory.MemoryUserDatabase
public final class MemoryUserDatabase
Concrete implementation of UserDatabase for an in-memory
database backed by an XML data file.
| Constructor Summary | |
|---|---|
MemoryUserDatabase()
|
|
| 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 Users defined in this user database. |
java.lang.String |
getPathname()
|
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. |
void |
setPathname(java.lang.String pathname)
|
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public MemoryUserDatabase()
| Method Detail |
|---|
public java.lang.String getPathname()
public void setPathname(java.lang.String pathname)
public void close()
throws java.lang.Exception
Finalize access to the underlying persistence layer.
close in interface UserDatabasejava.lang.Exception - if a database access error occurspublic User createUser(java.lang.String username)
Create and return a new User defined in this user database.
createUser in interface UserDatabaseusername - Username of the new user
IllegalArgumentExceptionif - the specified username
is not uniquepublic User findUser(java.lang.String username)
Return the existing User with the specified username,
if any; otherwise return null.
findUser in interface UserDatabaseusername - Username of the user to retrievepublic User[] findUsers()
Return the set of Users defined in this user database.
findUsers in interface UserDatabase
public void open()
throws java.lang.Exception
Initiate access to the underlying persistence layer.
open in interface UserDatabasejava.lang.Exception - if a database access error occurspublic void removeUser(User user)
User from this database.
removeUser in interface UserDatabaseuser - User to be removed
java.lang.IllegalArgumentException - if the specified user is not
associated with this database
public void save()
throws java.lang.Exception
Save any pending changes to the underlying persistence layer.
save in interface UserDatabasejava.lang.Exception - if a database access error occurs
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