Class UserPrincipalLookupService
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.- Since:
- 1.7
- See Also:
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Constructor SummaryConstructorsModifierConstructorDescriptionprotectedInitializes a new instance of this class.
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Method SummaryModifier and TypeMethodDescriptionabstract GroupPrincipallookupPrincipalByGroupName(String group) Lookup a group principal by group name.abstract UserPrincipallookupPrincipalByName(String name) Lookup a user principal by name.
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Constructor Details- 
UserPrincipalLookupServiceprotected UserPrincipalLookupService()Initializes a new instance of this class.
 
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Method Details- 
lookupPrincipalByNameLookup a user principal by name.- Parameters:
- name- the string representation of the user principal to lookup
- Returns:
- a user principal
- Throws:
- UserPrincipalNotFoundException- the principal does not exist
- IOException- if an I/O error occurs
 
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lookupPrincipalByGroupNameLookup 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 invokinglookupPrincipalByName.- Parameters:
- group- the string representation of the group to lookup
- Returns:
- a group principal
- Throws:
- UserPrincipalNotFoundException- the principal does not exist or is not a group
- IOException- if an I/O error occurs
 
 
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