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/*
 * RandomAccessFileSeekableSource.java
 *
 * Created on May 17, 2006, 1:45 PM
 * Copyright (c) 2006 Heiko Klein
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in 
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 *
 */
package com.nothome.delta;

import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;

/**
 * Wraps a random access file.
 */
public class RandomAccessFileSeekableSource implements SeekableSource {
  /** The raf. */
  private RandomAccessFile raf;

  /**
   * Constructs a new RandomAccessFileSeekableSource.
   *
   * @param raf the raf
   */
  public RandomAccessFileSeekableSource(RandomAccessFile raf) {
    if (raf == null)
      throw new NullPointerException("raf");
    this.raf = raf;
  }

  /* (non-Javadoc)
   * @see com.nothome.delta.SeekableSource#seek(long)
   */
  @Override
  public void seek(long pos) throws IOException {
    raf.seek(pos);
  }

  /**
   * Read.
   *
   * @param b the b
   * @param off the off
   * @param len the len
   * @return the int
   * @throws IOException Signals that an I/O exception has occurred.
   */
  public int read(byte[] b, int off, int len) throws IOException {
    return raf.read(b, off, len);
  }

  /**
   * Length.
   *
   * @return the long
   * @throws IOException Signals that an I/O exception has occurred.
   */
  public long length() throws IOException {
    return raf.length();
  }

  /* (non-Javadoc)
   * @see java.io.Closeable#close()
   */
  @Override
  public void close() throws IOException {
    raf.close();
  }

  /* (non-Javadoc)
   * @see com.nothome.delta.SeekableSource#read(java.nio.ByteBuffer)
   */
  @Override
  public int read(ByteBuffer bb) throws IOException {
    int c = raf.read(bb.array(), bb.position(), bb.remaining());
    if (c == -1)
      return -1;
    bb.position(bb.position() + c);
    return c;
  }
}