PermissionStatus.java
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上传日期:2018-01-08
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文件大小:4k
- /**
- * 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.io.*;
- import java.io.DataInput;
- import java.io.DataOutput;
- import java.io.IOException;
- /**
- * Store permission related information.
- */
- public class PermissionStatus implements Writable {
- static final WritableFactory FACTORY = new WritableFactory() {
- public Writable newInstance() { return new PermissionStatus(); }
- };
- static { // register a ctor
- WritableFactories.setFactory(PermissionStatus.class, FACTORY);
- }
- /** Create an immutable {@link PermissionStatus} object. */
- public static PermissionStatus createImmutable(
- String user, String group, FsPermission permission) {
- return new PermissionStatus(user, group, permission) {
- public PermissionStatus applyUMask(FsPermission umask) {
- throw new UnsupportedOperationException();
- }
- public void readFields(DataInput in) throws IOException {
- throw new UnsupportedOperationException();
- }
- };
- }
- private String username;
- private String groupname;
- private FsPermission permission;
- private PermissionStatus() {}
- /** Constructor */
- public PermissionStatus(String user, String group, FsPermission permission) {
- username = user;
- groupname = group;
- this.permission = permission;
- }
- /** Return user name */
- public String getUserName() {return username;}
- /** Return group name */
- public String getGroupName() {return groupname;}
- /** Return permission */
- public FsPermission getPermission() {return permission;}
- /**
- * Apply umask.
- * @see FsPermission#applyUMask(FsPermission)
- */
- public PermissionStatus applyUMask(FsPermission umask) {
- permission = permission.applyUMask(umask);
- return this;
- }
- /** {@inheritDoc} */
- public void readFields(DataInput in) throws IOException {
- username = Text.readString(in);
- groupname = Text.readString(in);
- permission = FsPermission.read(in);
- }
- /** {@inheritDoc} */
- public void write(DataOutput out) throws IOException {
- write(out, username, groupname, permission);
- }
- /**
- * Create and initialize a {@link PermissionStatus} from {@link DataInput}.
- */
- public static PermissionStatus read(DataInput in) throws IOException {
- PermissionStatus p = new PermissionStatus();
- p.readFields(in);
- return p;
- }
- /**
- * Serialize a {@link PermissionStatus} from its base components.
- */
- public static void write(DataOutput out,
- String username,
- String groupname,
- FsPermission permission) throws IOException {
- Text.writeString(out, username);
- Text.writeString(out, groupname);
- permission.write(out);
- }
- /** {@inheritDoc} */
- public String toString() {
- return username + ":" + groupname + ":" + permission;
- }
- }