content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master.file.state;
  
  /**
   * Class representing a directory ID. A directory ID has two parts; a container ID and a sequence
   * number.
   */
  public class DirectoryId {
    private long mContainerId;
    private long mSequenceNumber;
  
    private final UnmodifiableDirectoryId mImmutableView;
  
    /**
     * Creates a new DirectoryId starting at (0, 0).
     */
    public DirectoryId() {
      mContainerId = 0;
      mSequenceNumber = 0;
      mImmutableView = new UnmodifiableDirectoryId() {
        @Override
        public long getContainerId() {
          return mContainerId;
        }
  
        @Override
        public long getSequenceNumber() {
          return mSequenceNumber;
        }
      };
    }
  
    /**
     * @return the container ID
     */
    public long getContainerId() {
      return mContainerId;
    }
  
    /**
     * @param containerId the container ID to set
     */
    public void setContainerId(long containerId) {
      mContainerId = containerId;
    }
  
    /**
     * @return the sequence number
     */
    public long getSequenceNumber() {
      return mSequenceNumber;
    }
  
    /**
     * @param sequenceNumber the sequence number to set
     */
    public void setSequenceNumber(long sequenceNumber) {
      mSequenceNumber = sequenceNumber;
    }
  
    /** Immutable view of a DirectoryId. */
    public interface UnmodifiableDirectoryId {
      /**
       * @return the container ID
       */
      long getContainerId();
  
      /**
       * @return the sequence number
       */
      long getSequenceNumber();
    }
  
    /**
     * @return an unmodifiable view of the DirectoryId
     */
    public UnmodifiableDirectoryId getUnmodifiableView() {
      return mImmutableView;
    }
  }
  