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A Java NIO file system provider for HDFS
There is a newer version: 1.0.3
/*
 * Copyright 2016 Damien Carol 
 *
 * Licensed 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 hdfs.jsr203;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.channels.WritableByteChannel;

/**
 * Implement {@link FileChannel}.
 */
public class HadoopFileChannel extends FileChannel {

  private SeekableByteChannel internalChannel;

  public HadoopFileChannel(SeekableByteChannel newByteChannel) {
    this.internalChannel = newByteChannel;
  }

  @Override
  public int read(ByteBuffer dst) throws IOException {
    return this.internalChannel.read(dst);
  }

  @Override
  public long read(ByteBuffer[] dsts, int offset, int length)
      throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public int write(ByteBuffer src) throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public long write(ByteBuffer[] srcs, int offset, int length)
      throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public long position() throws IOException {
    return this.internalChannel.position();
  }

  @Override
  public FileChannel position(long newPosition) throws IOException {
    this.internalChannel.position(newPosition);
    return this;
  }

  @Override
  public long size() throws IOException {
    return this.internalChannel.size();
  }

  @Override
  public FileChannel truncate(long size) throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public void force(boolean metaData) throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public long transferTo(long position, long count, WritableByteChannel target)
      throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public long transferFrom(ReadableByteChannel src, long position, long count)
      throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public int read(ByteBuffer dst, long position) throws IOException {
    this.internalChannel = this.internalChannel.position(position);
    return this.internalChannel.read(dst);
  }

  @Override
  public int write(ByteBuffer src, long position) throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public MappedByteBuffer map(MapMode mode, long position, long size)
      throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public FileLock lock(long position, long size, boolean shared)
      throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  public FileLock tryLock(long position, long size, boolean shared)
      throws IOException {
    throw new IOException("Imcomplete implementation");
  }

  @Override
  protected void implCloseChannel() throws IOException {
    this.internalChannel.close();
  }

}