hadoop FsAction 源码
haddop FsAction 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/permission/FsAction.java
/**
* 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.Public
@InterfaceStability.Stable
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 FsAction that.
* @return if implies true,not false.
*/
public boolean implies(FsAction that) {
if (that != null) {
return (ordinal() & that.ordinal()) == that.ordinal();
}
return false;
}
/**
* AND operation.
* @param that FsAction that.
* @return FsAction.
*/
public FsAction and(FsAction that) {
return vals[ordinal() & that.ordinal()];
}
/**
* OR operation.
* @param that FsAction that.
* @return FsAction.
*/
public FsAction or(FsAction that) {
return vals[ordinal() | that.ordinal()];
}
/**
* NOT operation.
* @return FsAction.
*/
public FsAction not() {
return vals[7 - ordinal()];
}
/**
* Get the FsAction enum for String representation of permissions
*
* @param permission
* 3-character string representation of permission. ex: rwx
* @return Returns FsAction enum if the corresponding FsAction exists for permission.
* Otherwise returns null
*/
public static FsAction getFsAction(String permission) {
for (FsAction fsAction : vals) {
if (fsAction.SYMBOL.equals(permission)) {
return fsAction;
}
}
return null;
}
}
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