[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.fs.permission; |
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| 19 | |
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| 20 | /** |
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| 21 | * File system actions, e.g. read, write, etc. |
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| 22 | */ |
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| 23 | public enum FsAction { |
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| 24 | // POSIX style |
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| 25 | NONE("---"), |
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| 26 | EXECUTE("--x"), |
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| 27 | WRITE("-w-"), |
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| 28 | WRITE_EXECUTE("-wx"), |
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| 29 | READ("r--"), |
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| 30 | READ_EXECUTE("r-x"), |
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| 31 | READ_WRITE("rw-"), |
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| 32 | ALL("rwx"); |
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| 33 | |
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| 34 | /** Retain reference to value array. */ |
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| 35 | private final static FsAction[] vals = values(); |
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| 36 | |
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| 37 | /** Symbolic representation */ |
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| 38 | public final String SYMBOL; |
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| 39 | |
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| 40 | private FsAction(String s) { |
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| 41 | SYMBOL = s; |
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| 42 | } |
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| 43 | |
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| 44 | /** |
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| 45 | * Return true if this action implies that action. |
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| 46 | * @param that |
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| 47 | */ |
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| 48 | public boolean implies(FsAction that) { |
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| 49 | if (that != null) { |
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| 50 | return (ordinal() & that.ordinal()) == that.ordinal(); |
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| 51 | } |
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| 52 | return false; |
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| 53 | } |
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| 54 | |
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| 55 | /** AND operation. */ |
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| 56 | public FsAction and(FsAction that) { |
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| 57 | return vals[ordinal() & that.ordinal()]; |
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| 58 | } |
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| 59 | /** OR operation. */ |
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| 60 | public FsAction or(FsAction that) { |
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| 61 | return vals[ordinal() | that.ordinal()]; |
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| 62 | } |
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| 63 | /** NOT operation. */ |
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| 64 | public FsAction not() { |
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| 65 | return vals[7 - ordinal()]; |
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| 66 | } |
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| 67 | } |
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