001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.fs.permission; 019 020import org.apache.hadoop.classification.InterfaceAudience; 021import org.apache.hadoop.classification.InterfaceStability; 022 023/** 024 * Specifies the type of an ACL entry. 025 */ 026@InterfaceAudience.Public 027@InterfaceStability.Stable 028public enum AclEntryType { 029 /** 030 * An ACL entry applied to a specific user. These ACL entries can be unnamed, 031 * which applies to the file owner, or named, which applies to the specific 032 * named user. 033 */ 034 USER, 035 036 /** 037 * An ACL entry applied to a specific group. These ACL entries can be 038 * unnamed, which applies to the file's group, or named, which applies to the 039 * specific named group. 040 */ 041 GROUP, 042 043 /** 044 * An ACL mask entry. Mask entries are unnamed. During permission checks, 045 * the mask entry interacts with all ACL entries that are members of the group 046 * class. This consists of all named user entries, the unnamed group entry, 047 * and all named group entries. For each such entry, any permissions that are 048 * absent from the mask entry are removed from the effective permissions used 049 * during the permission check. 050 */ 051 MASK, 052 053 /** 054 * An ACL entry that applies to all other users that were not covered by one 055 * of the more specific ACL entry types. 056 */ 057 OTHER; 058 059 @Override 060 @InterfaceStability.Unstable 061 public String toString() { 062 // This currently just delegates to the stable string representation, but it 063 // is permissible for the output of this method to change across versions. 064 return toStringStable(); 065 } 066 067 /** 068 * Returns a string representation guaranteed to be stable across versions to 069 * satisfy backward compatibility requirements, such as for shell command 070 * output or serialization. 071 * 072 * @return stable, backward compatible string representation 073 */ 074 public String toStringStable() { 075 // The base implementation uses the enum value names, which are public API 076 // and therefore stable. 077 return super.toString(); 078 } 079}