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     */
018    package org.apache.hadoop.fs.permission;
019    
020    import org.apache.hadoop.classification.InterfaceAudience;
021    import org.apache.hadoop.classification.InterfaceStability;
022    
023    /**
024     * Specifies the type of an ACL entry.
025     */
026    @InterfaceAudience.Public
027    @InterfaceStability.Evolving
028    public 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    }