hadoop FsPermissionExtension 源码

haddop FsPermissionExtension 代码

文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/FsPermissionExtension.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.hdfs.protocol;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.permission.FsPermission;

/**
 * HDFS permission subclass used to indicate an ACL is present and/or that the
 * underlying file/dir is encrypted. The ACL/encrypted bits are not visible
 * directly to users of {@link FsPermission} serialization.  This is
 * done for backwards compatibility in case any existing clients assume the
 * value of FsPermission is in a particular range.
 */

/**
 * @deprecated ACLs, encryption, and erasure coding are managed on FileStatus.
 */
@Deprecated
@InterfaceAudience.Private
public class FsPermissionExtension extends FsPermission {
  private static final long serialVersionUID = 0x13c298a4;

  private final static short ACL_BIT = 1 << 12;
  private final static short ENCRYPTED_BIT = 1 << 13;
  private final static short ERASURE_CODED_BIT = 1 << 14;
  private final boolean aclBit;
  private final boolean encryptedBit;
  private final boolean erasureCodedBit;

  /**
   * Constructs a new FsPermissionExtension based on the given FsPermission.
   *
   * @param perm FsPermission containing permission bits
   */
  public FsPermissionExtension(FsPermission perm, boolean hasAcl,
      boolean isEncrypted, boolean isErasureCoded) {
    super(perm.toShort());
    aclBit = hasAcl;
    encryptedBit = isEncrypted;
    erasureCodedBit = isErasureCoded;
  }

  /**
   * Creates a new FsPermissionExtension by calling the base class constructor.
   *
   * @param perm short containing permission bits
   */
  public FsPermissionExtension(short perm) {
    super(perm);
    aclBit = (perm & ACL_BIT) != 0;
    encryptedBit = (perm & ENCRYPTED_BIT) != 0;
    erasureCodedBit = (perm & ERASURE_CODED_BIT) != 0;
  }

  @Override
  public short toExtendedShort() {
    return (short)(toShort()
        | (aclBit ? ACL_BIT : 0)
        | (encryptedBit ? ENCRYPTED_BIT : 0)
        | (erasureCodedBit ? ERASURE_CODED_BIT : 0));
  }

  @Override
  public boolean getAclBit() {
    return aclBit;
  }

  @Override
  public boolean getEncryptedBit() {
    return encryptedBit;
  }

  @Override
  public boolean getErasureCodedBit() {
    return erasureCodedBit;
  }

  @Override
  public boolean equals(Object o) {
    // This intentionally delegates to the base class.  This is only overridden
    // to suppress a FindBugs warning.
    return super.equals(o);
  }

  @Override
  public int hashCode() {
    // This intentionally delegates to the base class.  This is only overridden
    // to suppress a FindBugs warning.
    return super.hashCode();
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AclException 源码

hadoop AddErasureCodingPolicyResponse 源码

hadoop AlreadyBeingCreatedException 源码

hadoop BatchedDirectoryListing 源码

hadoop Block 源码

hadoop BlockChecksumOptions 源码

hadoop BlockChecksumType 源码

hadoop BlockLocalPathInfo 源码

hadoop BlockStoragePolicy 源码

hadoop BlockType 源码