CellIterator.php

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<?php
abstract class PHPExcel_Worksheet_CellIterator
{
        protected $_subject;

        protected $_position = null;

        protected $_onlyExistingCells = false;

        public function __destruct() {
                unset($this->_subject);
        }

    public function getIterateOnlyExistingCells() {
        return $this->_onlyExistingCells;
    }

    abstract protected function adjustForExistingOnlyRange();

    public function setIterateOnlyExistingCells($value = true) {
        $this->_onlyExistingCells = (boolean) $value;

        $this->adjustForExistingOnlyRange();
    }
}