/// <summary>Translates the given permission bits to the equivalent minimal ACL.</summary>
/// <param name="perm">FsPermission to translate</param>
/// <returns>
/// List<AclEntry> containing exactly 3 entries representing the owner,
/// group and other permissions
/// </returns>
public static IList <AclEntry> GetMinimalAcl(FsPermission perm)
{
return(Lists.NewArrayList(new AclEntry.Builder().SetScope(AclEntryScope.Access).SetType
(AclEntryType.User).SetPermission(perm.GetUserAction()).Build(), new AclEntry.Builder
().SetScope(AclEntryScope.Access).SetType(AclEntryType.Group).SetPermission(perm
.GetGroupAction()).Build(), new AclEntry.Builder().SetScope(AclEntryScope.Access
).SetType(AclEntryType.Other).SetPermission(perm.GetOtherAction()).Build()));
}
/// <summary>Given permissions and extended ACL entries, returns the full logical ACL.
/// </summary>
/// <param name="perm">FsPermission containing permissions</param>
/// <param name="entries">List<AclEntry> containing extended ACL entries</param>
/// <returns>List<AclEntry> containing full logical ACL</returns>
public static IList <AclEntry> GetAclFromPermAndEntries(FsPermission perm, IList <AclEntry
> entries)
{
IList <AclEntry> acl = Lists.NewArrayListWithCapacity(entries.Count + 3);
// Owner entry implied by owner permission bits.
acl.AddItem(new AclEntry.Builder().SetScope(AclEntryScope.Access).SetType(AclEntryType
.User).SetPermission(perm.GetUserAction()).Build());
// All extended access ACL entries.
bool hasAccessAcl = false;
IEnumerator <AclEntry> entryIter = entries.GetEnumerator();
AclEntry curEntry = null;
while (entryIter.HasNext())
{
curEntry = entryIter.Next();
if (curEntry.GetScope() == AclEntryScope.Default)
{
break;
}
hasAccessAcl = true;
acl.AddItem(curEntry);
}
// Mask entry implied by group permission bits, or group entry if there is
// no access ACL (only default ACL).
acl.AddItem(new AclEntry.Builder().SetScope(AclEntryScope.Access).SetType(hasAccessAcl
? AclEntryType.Mask : AclEntryType.Group).SetPermission(perm.GetGroupAction()).
Build());
// Other entry implied by other bits.
acl.AddItem(new AclEntry.Builder().SetScope(AclEntryScope.Access).SetType(AclEntryType
.Other).SetPermission(perm.GetOtherAction()).Build());
// Default ACL entries.
if (curEntry != null && curEntry.GetScope() == AclEntryScope.Default)
{
acl.AddItem(curEntry);
while (entryIter.HasNext())
{
acl.AddItem(entryIter.Next());
}
}
return(acl);
}