class Chunk<T> {

  private final int position;
  private List<T> lines;

  /**
   * Creates a chunk and saves a copy of affected lines
   * 
   * @param position
   *            the start position
   * @param lines
   *            the affected lines
   */
  public Chunk(int position, List<T> lines) {
    this.position = position;
    this.lines = lines;
  }

  /**
   * Verifies that this chunk's saved text matches the corresponding text in
   * the given sequence.
   * 
   * @param target
   *            the sequence to verify against.
   */
  public void verify(List<T> target) throws IllegalStateException {
    checkState(last() <= target.size(), "Incorrect Chunk: the position of chunk > target size");
    for (int i = 0; i < size(); i++) {
      checkState(target.get(position + i).equals(lines.get(i)),
                 "Incorrect Chunk: the chunk content doesn't match the target");
    }
  }

  /**
   * @return the start position of chunk in the text
   */
  public int getPosition() {
    return position;
  }

  /**
   * @return the affected lines
   */
  public List<T> getLines() {
    return lines;
  }

  /**
   * Return the chunk size
   * @return the chunk size
   */
  public int size() {
    return lines.size();
  }

  /**
   * Returns the index of the last line of the chunk.
   * @return the index of the last line of the chunk.
   */
  public int last() {
    return getPosition() + size() - 1;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((lines == null) ? 0 : lines.hashCode());
    result = prime * result + position;
    result = prime * result + size();
    return result;
  }

  @Override
  public boolean equals(Object obj) {<FILL_FUNCTION_BODY>}

  @Override
  public String toString() {
    return "[position: " + position + ", size: " + size() + ", lines: " + lines + "]";
  }

}

    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    @SuppressWarnings("rawtypes")
    Chunk other = (Chunk) obj;
    if (lines == null) {
      if (other.lines != null)
        return false;
    } else if (!lines.equals(other.lines))
      return false;
    return position == other.position;
  
<no_super_class>