<?php

namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;

/**
 * Copyright (c) 2006 - 2015 PhpSpreadsheet.
 *
 * 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   PhpSpreadsheet
 *
 * @copyright  Copyright (c) 2006 - 2015 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 */
abstract class WriterPart
{
    /**
     * Parent IWriter object.
     *
     * @var \PhpOffice\PhpSpreadsheet\Writer\IWriter
     */
    private $parentWriter;

    /**
     * Set parent IWriter object.
     *
     * @param \PhpOffice\PhpSpreadsheet\Writer\IWriter $pWriter
     *
     * @throws \PhpOffice\PhpSpreadsheet\Writer\Exception
     */
    public function setParentWriter(\PhpOffice\PhpSpreadsheet\Writer\IWriter $pWriter = null)
    {
        $this->parentWriter = $pWriter;
    }

    /**
     * Get parent IWriter object.
     *
     * @throws \PhpOffice\PhpSpreadsheet\Writer\Exception
     *
     * @return \PhpOffice\PhpSpreadsheet\Writer\IWriter
     */
    public function getParentWriter()
    {
        if (!is_null($this->parentWriter)) {
            return $this->parentWriter;
        }
        throw new \PhpOffice\PhpSpreadsheet\Writer\Exception('No parent \\PhpOffice\\PhpSpreadsheet\\Writer\\IWriter assigned.');
    }

    /**
     * Set parent IWriter object.
     *
     * @param \PhpOffice\PhpSpreadsheet\Writer\IWriter $pWriter
     *
     * @throws \PhpOffice\PhpSpreadsheet\Writer\Exception
     */
    public function __construct(\PhpOffice\PhpSpreadsheet\Writer\IWriter $pWriter = null)
    {
        if (!is_null($pWriter)) {
            $this->parentWriter = $pWriter;
        }
    }
}