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.worker.block;
  
  import alluxio.underfs.SeekableUnderFileInputStream;
  
  import com.google.common.base.Preconditions;
  
  import java.io.IOException;
  
  /**
   * A seekable input stream that can be cached.
   */
  class CachedSeekableInputStream extends SeekableUnderFileInputStream {
    /** A unique resource id annotated for resource tracking. */
    private final Long mResourceId;
    /** The file path of the input stream. */
    private final String mFilePath;
    /** The file Id. */
    private final long mFileId;
  
    /**
     * Creates a new {@link CachedSeekableInputStream}.
     *
     * @param inputStream the input stream from the under storage
     * @param resourceId the resource id
     * @param fileId the file id
     * @param filePath the file path
     */
    CachedSeekableInputStream(SeekableUnderFileInputStream inputStream, long resourceId, long fileId,
        String filePath) {
      super(inputStream);
      Preconditions.checkArgument(resourceId >= 0, "resource id should be positive");
      mResourceId = resourceId;
      mFilePath = filePath;
      mFileId = fileId;
    }
  
    /**
     * @return the resource id
     */
    long getResourceId() {
      return mResourceId;
    }
  
    /**
     * @return the under file path
     */
    String getFilePath() {
      return mFilePath;
    }
  
    /**
     * @return the file id
     */
    Long getFileId() {
      return mFileId;
    }
  
    @Override
    public void seek(long pos) throws IOException {
      ((SeekableUnderFileInputStream) in).seek(pos);
    }
  
    @Override
    public long getPos() throws IOException {
      return ((SeekableUnderFileInputStream) in).getPos();
    }
  }
  