| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.fs.permission; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** |
| * File system actions, e.g. read, write, etc. |
| */ |
| @InterfaceAudience.LimitedPrivate({"HDFS"}) |
| @InterfaceStability.Unstable |
| public enum FsAction { |
| // POSIX style |
| NONE("---"), |
| EXECUTE("--x"), |
| WRITE("-w-"), |
| WRITE_EXECUTE("-wx"), |
| READ("r--"), |
| READ_EXECUTE("r-x"), |
| READ_WRITE("rw-"), |
| ALL("rwx"); |
| |
| /** Retain reference to value array. */ |
| private final static FsAction[] vals = values(); |
| |
| /** Symbolic representation */ |
| public final String SYMBOL; |
| |
| private FsAction(String s) { |
| SYMBOL = s; |
| } |
| |
| /** |
| * Return true if this action implies that action. |
| * @param that |
| */ |
| public boolean implies(FsAction that) { |
| if (that != null) { |
| return (ordinal() & that.ordinal()) == that.ordinal(); |
| } |
| return false; |
| } |
| |
| /** AND operation. */ |
| public FsAction and(FsAction that) { |
| return vals[ordinal() & that.ordinal()]; |
| } |
| /** OR operation. */ |
| public FsAction or(FsAction that) { |
| return vals[ordinal() | that.ordinal()]; |
| } |
| /** NOT operation. */ |
| public FsAction not() { |
| return vals[7 - ordinal()]; |
| } |
| } |