FsAction.java
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上传日期:2018-01-08
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- /**
- * 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;
- /**
- * File system actions, e.g. read, write, etc.
- */
- 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()];
- }
- }