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<?php
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/**
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 * PHPExcel
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 *
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 * Copyright (c) 2006 - 2013 PHPExcel
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 * @category   PHPExcel
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 * @package    PHPExcel_Worksheet
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 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
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 * @version    ##VERSION##, ##DATE##
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 */
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/**
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 * PHPExcel_Worksheet_CellIterator
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 *
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 * Used to iterate rows in a PHPExcel_Worksheet
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 *
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 * @category   PHPExcel
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 * @package    PHPExcel_Worksheet
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 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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 */
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class PHPExcel_Worksheet_CellIterator implements Iterator
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{
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	/**
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	 * PHPExcel_Worksheet to iterate
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	 *
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	 * @var PHPExcel_Worksheet
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	 */
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	private $_subject;
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	/**
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	 * Row index
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	 *
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	 * @var int
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	 */
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	private $_rowIndex;
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	/**
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	 * Current iterator position
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	 *
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	 * @var int
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	 */
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	private $_position = 0;
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	/**
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	 * Loop only existing cells
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	 *
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	 * @var boolean
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	 */
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	private $_onlyExistingCells = true;
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	/**
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	 * Create a new cell iterator
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	 *
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	 * @param PHPExcel_Worksheet 		$subject
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	 * @param int						$rowIndex
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	 */
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	public function __construct(PHPExcel_Worksheet $subject = null, $rowIndex = 1) {
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		// Set subject and row index
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		$this->_subject 	= $subject;
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		$this->_rowIndex 	= $rowIndex;
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	}
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	/**
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	 * Destructor
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	 */
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	public function __destruct() {
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		unset($this->_subject);
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	}
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	/**
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	 * Rewind iterator
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	 */
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    public function rewind() {
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        $this->_position = 0;
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    }
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    /**
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     * Current PHPExcel_Cell
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     *
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     * @return PHPExcel_Cell
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     */
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    public function current() {
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		return $this->_subject->getCellByColumnAndRow($this->_position, $this->_rowIndex);
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    }
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    /**
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     * Current key
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     *
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     * @return int
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     */
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    public function key() {
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        return $this->_position;
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    }
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    /**
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     * Next value
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     */
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    public function next() {
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        ++$this->_position;
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    }
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    /**
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     * Are there any more PHPExcel_Cell instances available?
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     *
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     * @return boolean
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     */
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    public function valid() {
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        // columnIndexFromString() returns an index based at one,
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        // treat it as a count when comparing it to the base zero
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        // position.
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        $columnCount = PHPExcel_Cell::columnIndexFromString($this->_subject->getHighestColumn());
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        if ($this->_onlyExistingCells) {
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            // If we aren't looking at an existing cell, either
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            // because the first column doesn't exist or next() has
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            // been called onto a nonexistent cell, then loop until we
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            // find one, or pass the last column.
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            while ($this->_position < $columnCount &&
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                   !$this->_subject->cellExistsByColumnAndRow($this->_position, $this->_rowIndex)) {
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                ++$this->_position;
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            }
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        }
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        return $this->_position < $columnCount;
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    }
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	/**
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	 * Get loop only existing cells
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	 *
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	 * @return boolean
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	 */
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    public function getIterateOnlyExistingCells() {
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    	return $this->_onlyExistingCells;
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    }
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	/**
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	 * Set the iterator to loop only existing cells
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	 *
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	 * @param	boolean		$value
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	 */
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    public function setIterateOnlyExistingCells($value = true) {
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    	$this->_onlyExistingCells = $value;
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    }
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}