org.apache.hadoop.hdfs.protocol.HdfsLocatedFileStatus Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of hadoop-hdfs-instrumented
The newest version!
/**
 * 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 java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

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

/** 
 * Interface that represents the over the wire information
 * including block locations for a file.
 */
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class HdfsLocatedFileStatus extends HdfsFileStatus {
  private LocatedBlocks locations;
  
  /**
   * Default constructor
   */
  public HdfsLocatedFileStatus() {
  }
  
  /**
   * Constructor
   * 
   * @param length size
   * @param isdir if this is directory
   * @param block_replication the file's replication factor
   * @param blocksize the file's block size
   * @param modification_time most recent modification time
   * @param access_time most recent access time
   * @param permission permission
   * @param owner owner
   * @param group group
   * @param symlink symbolic link
   * @param path local path name in java UTF8 format 
   * @param locations block locations
   */
  public HdfsLocatedFileStatus(long length, boolean isdir,
      int block_replication,
	    long blocksize, long modification_time, long access_time,
	    FsPermission permission, String owner, String group, 
	    byte[] symlink, byte[] path, LocatedBlocks locations) {
	  super(length, isdir, block_replication, blocksize, modification_time,
		  access_time, permission, owner, group, symlink, path);
    this.locations = locations;
	}
	
	public LocatedBlocks getBlockLocations() {
		return locations;
	}
	
  //////////////////////////////////////////////////
  // Writable
  //////////////////////////////////////////////////
  public void write(DataOutput out) throws IOException {
    super.write(out);
    if (!isDir() && !isSymlink()) {
      locations.write(out);
    }
  }

  public void readFields(DataInput in) throws IOException {
    super.readFields(in);
    if (!isDir() && !isSymlink()) {
      locations = new LocatedBlocks();
      locations.readFields(in);
    }
  }
}