File Source for WriterPart.php

<?php
/**
* PHPExcel
*
* Copyright (c) 2006 - 2011 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 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version 1.7.6, 2011-02-27
*/
/**
* PHPExcel_Writer_Excel2007_WriterPart
*
* @category PHPExcel
* @package PHPExcel_Writer_Excel2007
* @copyright Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
*/
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 Exception
*/
public function setParentWriter(PHPExcel_Writer_IWriter $pWriter = null) {
$this->_parentWriter = $pWriter;
}
/**
* Get parent IWriter object
*
* @return PHPExcel_Writer_IWriter
* @throws Exception
*/
public function getParentWriter() {
if (!is_null($this->_parentWriter)) {
return $this->_parentWriter;
} else {
throw new Exception("No parent PHPExcel_Writer_IWriter assigned.");
}
}
/**
* Set parent IWriter object
*
* @param PHPExcel_Writer_IWriter $pWriter
* @throws Exception
*/
public function __construct(PHPExcel_Writer_IWriter $pWriter = null) {
if (!is_null($pWriter)) {
$this->_parentWriter = $pWriter;
}
}
}

Source for file WriterPart.php