org.apache.hadoop.hdfs.server.namenode.AclFeature.java Source code

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Here is the source code for org.apache.hadoop.hdfs.server.namenode.AclFeature.java

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/**
 * 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 com.google.common.base.Preconditions;
import 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 int getRefCount() {
        return refCount;
    }

    @Override
    public int incrementAndGetRefCount() {
        return ++refCount;
    }

    @Override
    public int decrementAndGetRefCount() {
        return (refCount > 0) ? --refCount : 0;
    }
}