hadoop AclFeature 源码
haddop AclFeature 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/AclFeature.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.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.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) {
if (pos < 0 || pos > entries.length) {
throw new IndexOutOfBoundsException("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;
}
}
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