Package org.apache.hadoop.security

Class NullGroupsMapping

java.lang.Object

org.apache.hadoop.security.NullGroupsMapping

All Implemented Interfaces:

GroupMappingServiceProvider

public class NullGroupsMapping
extends Object
implements GroupMappingServiceProvider

This class provides groups mapping for UserGroupInformation when the user group information will not be used.

Field Summary

Fields inherited from interface org.apache.hadoop.security.GroupMappingServiceProvider

GROUP_MAPPING_CONFIG_PREFIX

Constructor Summary

Constructors

Constructor	Description
NullGroupsMapping()

Method Summary

Modifier and Type	Method	Description
void	cacheGroupsAdd(List<String> groups)	Nothing is returned, so nothing is cached.
void	cacheGroupsRefresh()	Nothing is returned, so nothing is cached.
List<String>	getGroups(String user)	Returns an empty list.
Set<String>	getGroupsSet(String user)	Get all various group memberships of a given user.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NullGroupsMapping

public NullGroupsMapping()

Method Details

cacheGroupsAdd

public void cacheGroupsAdd(List<String> groups)

Nothing is returned, so nothing is cached.

Specified by:

cacheGroupsAdd in interface GroupMappingServiceProvider

Parameters:

groups - ignored

getGroupsSet

public Set<String> getGroupsSet(String user)
                         throws IOException

Get all various group memberships of a given user. Returns EMPTY set in case of non-existing user

Specified by:

getGroupsSet in interface GroupMappingServiceProvider

Parameters:

user - User's name

Returns:

set of group memberships of user

Throws:

IOException - raised on errors performing I/O.

getGroups

public List<String> getGroups(String user)

Returns an empty list.

Specified by:

getGroups in interface GroupMappingServiceProvider

Parameters:

user - ignored

Returns:

an empty list

cacheGroupsRefresh

public void cacheGroupsRefresh()

Nothing is returned, so nothing is cached.

Specified by:

cacheGroupsRefresh in interface GroupMappingServiceProvider