<?php

/**
 * PHPExcel_Writer_Excel2007_WriterPart
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */
abstract class PHPExcel_Writer_Excel2007_WriterPart
{
  /**
   * Parent IWriter object
   *
   * @var PHPExcel_Writer_IWriter
   */
  private $parentWriter;
  
  /**
   * Set parent IWriter object
   *
   * @param PHPExcel_Writer_IWriter $pWriter          
   * @throws PHPExcel_Writer_Exception
   */
  public function setParentWriter(PHPExcel_Writer_IWriter $pWriter = null)
  {
    $this->parentWriter = $pWriter;
  }
  
  /**
   * Get parent IWriter object
   *
   * @return PHPExcel_Writer_IWriter
   * @throws PHPExcel_Writer_Exception
   */
  public function getParentWriter()
  {
    if (! is_null ( $this->parentWriter ))
    {
      return $this->parentWriter;
    }
    else
    {
      throw new PHPExcel_Writer_Exception ( "No parent PHPExcel_Writer_IWriter assigned." );
    }
  }
  
  /**
   * Set parent IWriter object
   *
   * @param PHPExcel_Writer_IWriter $pWriter          
   * @throws PHPExcel_Writer_Exception
   */
  public function __construct(PHPExcel_Writer_IWriter $pWriter = null)
  {
    if (! is_null ( $pWriter ))
    {
      $this->parentWriter = $pWriter;
    }
  }
}
