WorksheetIterator.php

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<?php
class PHPExcel_WorksheetIterator extends CachingIterator
{
        private $_subject;

        private $_position = 0;

        public function __construct(PHPExcel $subject = null) {
                // Set subject
                $this->_subject = $subject;
        }

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

    public function rewind() {
        $this->_position = 0;
    }

    public function current() {
        return $this->_subject->getSheet($this->_position);
    }

    public function key() {
        return $this->_position;
    }

    public function next() {
        ++$this->_position;
    }

    public function valid() {
        return $this->_position < $this->_subject->getSheetCount();
    }
}