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.fuse.file;
  
  import com.google.common.base.Preconditions;
  
  import java.io.Closeable;
  import java.io.IOException;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Convenience class to encapsulate file stream
   * and its information (path, id) for reading or writing alluxio file.
   * @param <T> the concrete fuse file stream subclass
   */
  @ThreadSafe
  public final class FuseFileEntry<T extends FuseFileStream>
      implements Closeable {
    private final long mId;
    private final String mPath;
    private final T mFileStream;
  
    /**
     * Constructs a new {@link FuseFileEntry} for an Alluxio file.
     *
     * @param id the id of the file
     * @param path the path of the file
     * @param fileStream the in/out stream of the file
     */
    public FuseFileEntry(long id, String path, T fileStream) {
      Preconditions.checkArgument(id >= 0, "id should not be negative");
      Preconditions.checkArgument(path != null && !path.isEmpty(),
          "path should not be null or empty");
      mFileStream = Preconditions.checkNotNull(fileStream, "file stream cannot be null");
      mId = id;
      mPath = path;
    }
  
    /**
     * @return the id of the file
     */
    public long getId() {
      return mId;
    }
  
    /**
     * @return the path of the file
     */
    public String getPath() {
      return mPath;
    }
  
    /**
     * Gets the fuse file stream for this entry.
     *
     * @return a fuse file stream
     */
    public T getFileStream() {
      return mFileStream;
    }
  
    /**
     * Closes the underlying open streams.
     */
    @Override
    public void close() throws IOException {
      mFileStream.close();
    }
  }
  