WriterPart.php

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<?php
abstract class PHPExcel_Writer_Excel2007_WriterPart
{
        private $_parentWriter;

        public function setParentWriter(PHPExcel_Writer_IWriter $pWriter = null) {
                $this->_parentWriter = $pWriter;
        }

        public function getParentWriter() {
                if (!is_null($this->_parentWriter)) {
                        return $this->_parentWriter;
                } else {
                        throw new PHPExcel_Writer_Exception("No parent PHPExcel_Writer_IWriter assigned.");
                }
        }

        public function __construct(PHPExcel_Writer_IWriter $pWriter = null) {
                if (!is_null($pWriter)) {
                        $this->_parentWriter = $pWriter;
                }
        }

}