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public
abstract
class
UserPrincipalLookupService
extends Object
java.lang.Object | |
↳ | java.nio.file.attribute.UserPrincipalLookupService |
An object to lookup user and group principals by name. A UserPrincipal
represents an identity that may be used to determine access rights to objects
in a file system. A GroupPrincipal
represents a group identity.
A UserPrincipalLookupService
defines methods to lookup identities by
name or group name (which are typically user or account names). Whether names
and group names are case sensitive or not depends on the implementation.
The exact definition of a group is implementation specific but typically a
group represents an identity created for administrative purposes so as to
determine the access rights for the members of the group. In particular it is
implementation specific if the namespace for names and groups is the
same or is distinct. To ensure consistent and correct behavior across
platforms it is recommended that this API be used as if the namespaces are
distinct. In other words, the lookupPrincipalByName
should be used to lookup users, and lookupPrincipalByGroupName
should be used to
lookup groups.
Protected constructors | |
---|---|
UserPrincipalLookupService()
Initializes a new instance of this class. |
Public methods | |
---|---|
abstract
GroupPrincipal
|
lookupPrincipalByGroupName(String group)
Lookup a group principal by group name. |
abstract
UserPrincipal
|
lookupPrincipalByName(String name)
Lookup a user principal by name. |
Inherited methods | |
---|---|
protected UserPrincipalLookupService ()
Initializes a new instance of this class.
public abstract GroupPrincipal lookupPrincipalByGroupName (String group)
Lookup a group principal by group name.
Where an implementation does not support any notion of group then
this method always throws UserPrincipalNotFoundException
. Where
the namespace for user accounts and groups is the same, then this method
is identical to invoking lookupPrincipalByName
.
Parameters | |
---|---|
group |
String : the string representation of the group to lookup |
Returns | |
---|---|
GroupPrincipal |
a group principal |
Throws | |
---|---|
UserPrincipalNotFoundException |
the principal does not exist or is not a group |
IOException |
if an I/O error occurs |
SecurityException |
In the case of the default provider, and a security manager is
installed, it checks RuntimePermission ("lookupUserInformation") |
public abstract UserPrincipal lookupPrincipalByName (String name)
Lookup a user principal by name.
Parameters | |
---|---|
name |
String : the string representation of the user principal to lookup |
Returns | |
---|---|
UserPrincipal |
a user principal |
Throws | |
---|---|
UserPrincipalNotFoundException |
the principal does not exist |
IOException |
if an I/O error occurs |
SecurityException |
In the case of the default provider, and a security manager is
installed, it checks RuntimePermission ("lookupUserInformation") |