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

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Here is the source code for org.apache.hadoop.hdfs.server.namenode.INodeAttributes.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 org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.permission.PermissionStatus;
import org.apache.hadoop.hdfs.server.namenode.INodeWithAdditionalFields.PermissionStatusFormat;
import org.apache.hadoop.hdfs.server.namenode.XAttrFeature;

/**
 * The attributes of an inode.
 */
@InterfaceAudience.Private
public interface INodeAttributes {

    public boolean isDirectory();

    /**
     * @return null if the local name is null;
     *         otherwise, return the local name byte array.
     */
    public byte[] getLocalNameBytes();

    /** @return the user name. */
    public String getUserName();

    /** @return the group name. */
    public String getGroupName();

    /** @return the permission. */
    public FsPermission getFsPermission();

    /** @return the permission as a short. */
    public short getFsPermissionShort();

    /** @return the permission information as a long. */
    public long getPermissionLong();

    /** @return the ACL feature. */
    public AclFeature getAclFeature();

    /** @return the XAttrs feature. */
    public XAttrFeature getXAttrFeature();

    /** @return the modification time. */
    public long getModificationTime();

    /** @return the access time. */
    public long getAccessTime();

    /** A read-only copy of the inode attributes. */
    public static abstract class SnapshotCopy implements INodeAttributes {
        private final byte[] name;
        private final long permission;
        private final AclFeature aclFeature;
        private final long modificationTime;
        private final long accessTime;
        private XAttrFeature xAttrFeature;

        SnapshotCopy(byte[] name, PermissionStatus permissions, AclFeature aclFeature, long modificationTime,
                long accessTime, XAttrFeature xAttrFeature) {
            this.name = name;
            this.permission = PermissionStatusFormat.toLong(permissions);
            if (aclFeature != null) {
                aclFeature = AclStorage.addAclFeature(aclFeature);
            }
            this.aclFeature = aclFeature;
            this.modificationTime = modificationTime;
            this.accessTime = accessTime;
            this.xAttrFeature = xAttrFeature;
        }

        SnapshotCopy(INode inode) {
            this.name = inode.getLocalNameBytes();
            this.permission = inode.getPermissionLong();
            if (inode.getAclFeature() != null) {
                aclFeature = AclStorage.addAclFeature(inode.getAclFeature());
            } else {
                aclFeature = null;
            }
            this.modificationTime = inode.getModificationTime();
            this.accessTime = inode.getAccessTime();
            this.xAttrFeature = inode.getXAttrFeature();
        }

        @Override
        public final byte[] getLocalNameBytes() {
            return name;
        }

        @Override
        public final String getUserName() {
            return PermissionStatusFormat.getUser(permission);
        }

        @Override
        public final String getGroupName() {
            return PermissionStatusFormat.getGroup(permission);
        }

        @Override
        public final FsPermission getFsPermission() {
            return new FsPermission(getFsPermissionShort());
        }

        @Override
        public final short getFsPermissionShort() {
            return PermissionStatusFormat.getMode(permission);
        }

        @Override
        public long getPermissionLong() {
            return permission;
        }

        @Override
        public AclFeature getAclFeature() {
            return aclFeature;
        }

        @Override
        public final long getModificationTime() {
            return modificationTime;
        }

        @Override
        public final long getAccessTime() {
            return accessTime;
        }

        @Override
        public final XAttrFeature getXAttrFeature() {
            return xAttrFeature;
        }
    }
}