ShellBasedUnixGroupsNetgroupMapping (Hadoop 1.2.2-SNAPSHOT API)

```
public class ShellBasedUnixGroupsNetgroupMapping
extends ShellBasedUnixGroupsMapping
```
A simple shell-based implementation of GroupMappingServiceProvider that exec's the groups shell command to fetch the group memberships of a given user.

字段
限定符和类型	字段和说明
`protected static Map<String,Set<String>>`	`netgroupToUsersMap`
`protected static boolean`	`netgroupToUsersMapUpdated`
`protected static Map<String,Set<String>>`	`userToNetgroupsMap`

构造器
构造器和说明
`ShellBasedUnixGroupsNetgroupMapping()`

方法
限定符和类型	方法和说明
`void`	`cacheGroupsAdd(List<String> groups)` Caches the group user information
`void`	`cacheGroupsRefresh()` Refresh the cache of groups and user mapping
`protected void`	`cacheNetgroup(String group)`
`protected String`	`execShellGetUnixGroups(String user)`
`protected String`	`execShellGetUserForNetgroup(String netgroup)`
`List<String>`	`getGroups(String user)` Get all various group memberships of a given user.
`protected void`	`getNetgroups(String user, List<String> groups)`

protected static boolean netgroupToUsersMapUpdated

protected static Map<String,Set<String>> netgroupToUsersMap

protected static Map<String,Set<String>> userToNetgroupsMap

构造器详细资料
- ShellBasedUnixGroupsNetgroupMapping
```
public ShellBasedUnixGroupsNetgroupMapping()
```

protected void cacheNetgroup(String group)
                      throws IOException

protected void getNetgroups(String user,
                List<String> groups)
                     throws IOException

protected String execShellGetUnixGroups(String user)
                                 throws IOException

protected String execShellGetUserForNetgroup(String netgroup)
                                      throws IOException

类 ShellBasedUnixGroupsNetgroupMapping