| /** |
| * 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.server.namenode; |
| |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.fs.permission.AclEntry; |
| import org.apache.hadoop.hdfs.util.ReferenceCountMap.ReferenceCounter; |
| |
| import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions; |
| import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList; |
| |
| /** |
| * Feature that represents the ACLs of the inode. |
| */ |
| @InterfaceAudience.Private |
| public class AclFeature implements INode.Feature, ReferenceCounter { |
| public static final ImmutableList<AclEntry> EMPTY_ENTRY_LIST = |
| ImmutableList.of(); |
| private int refCount = 0; |
| |
| private final int [] entries; |
| |
| public AclFeature(int[] entries) { |
| this.entries = entries; |
| } |
| |
| /** |
| * Get the number of entries present |
| */ |
| int getEntriesSize() { |
| return entries.length; |
| } |
| |
| /** |
| * Get the entry at the specified position |
| * @param pos Position of the entry to be obtained |
| * @return integer representation of AclEntry |
| * @throws IndexOutOfBoundsException if pos out of bound |
| */ |
| int getEntryAt(int pos) { |
| Preconditions.checkPositionIndex(pos, entries.length, |
| "Invalid position for AclEntry"); |
| return entries[pos]; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (o == null) { |
| return false; |
| } |
| if (getClass() != o.getClass()) { |
| return false; |
| } |
| return Arrays.equals(entries, ((AclFeature) o).entries); |
| } |
| |
| @Override |
| public String toString() { |
| return "AclFeature : " + Integer.toHexString(hashCode()) + " Size of entries : " + entries.length; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Arrays.hashCode(entries); |
| } |
| |
| @Override |
| public synchronized int getRefCount() { |
| return refCount; |
| } |
| |
| @Override |
| public synchronized int incrementAndGetRefCount() { |
| return ++refCount; |
| } |
| |
| @Override |
| public synchronized int decrementAndGetRefCount() { |
| return (refCount > 0) ? --refCount : 0; |
| } |
| } |