<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2011 PHPExcel
 *
 * 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   PHPExcel
 * @package	PHPExcel_Worksheet
 * @copyright  Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license	http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version	1.7.6, 2011-02-27
 */


/**
 * PHPExcel_Worksheet
 *
 * @category   PHPExcel
 * @package	PHPExcel_Worksheet
 * @copyright  Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Worksheet implements PHPExcel_IComparable
{
	/* Break types */
	const BREAK_NONE	= 0;
	const BREAK_ROW		= 1;
	const BREAK_COLUMN	= 2;

	/* Sheet state */
	const SHEETSTATE_VISIBLE	= 'visible';
	const SHEETSTATE_HIDDEN	= 'hidden';
	const SHEETSTATE_VERYHIDDEN = 'veryHidden';

	/**
	 * Invalid characters in sheet title
	 *
	 * @var array
	 */
	private static $_invalidCharacters = array('*', ':', '/', '\\', '?', '[', ']');

	/**
	 * Parent spreadsheet
	 *
	 * @var PHPExcel
	 */
	private $_parent;

	/**
	 * Cacheable collection of cells
	 *
	 * @var PHPExcel_CachedObjectStorage_xxx
	 */
	private $_cellCollection = null;

	/**
	 * Collection of row dimensions
	 *
	 * @var PHPExcel_Worksheet_RowDimension[]
	 */
	private $_rowDimensions = array();

	/**
	 * Default row dimension
	 *
	 * @var PHPExcel_Worksheet_RowDimension
	 */
	private $_defaultRowDimension = null;

	/**
	 * Collection of column dimensions
	 *
	 * @var PHPExcel_Worksheet_ColumnDimension[]
	 */
	private $_columnDimensions = array();

	/**
	 * Default column dimension
	 *
	 * @var PHPExcel_Worksheet_ColumnDimension
	 */
	private $_defaultColumnDimension = null;

	/**
	 * Collection of drawings
	 *
	 * @var PHPExcel_Worksheet_BaseDrawing[]
	 */
	private $_drawingCollection = null;

	/**
	 * Worksheet title
	 *
	 * @var string
	 */
	private $_title;

	/**
	 * Sheet state
	 *
	 * @var string
	 */
	private $_sheetState;

	/**
	 * Page setup
	 *
	 * @var PHPExcel_Worksheet_PageSetup
	 */
	private $_pageSetup;

	/**
	 * Page margins
	 *
	 * @var PHPExcel_Worksheet_PageMargins
	 */
	private $_pageMargins;

	/**
	 * Page header/footer
	 *
	 * @var PHPExcel_Worksheet_HeaderFooter
	 */
	private $_headerFooter;

	/**
	 * Sheet view
	 *
	 * @var PHPExcel_Worksheet_SheetView
	 */
	private $_sheetView;

	/**
	 * Protection
	 *
	 * @var PHPExcel_Worksheet_Protection
	 */
	private $_protection;

	/**
	 * Collection of styles
	 *
	 * @var PHPExcel_Style[]
	 */
	private $_styles = array();

	/**
	 * Conditional styles. Indexed by cell coordinate, e.g. 'A1'
	 *
	 * @var array
	 */
	private $_conditionalStylesCollection = array();

	/**
	 * Is the current cell collection sorted already?
	 *
	 * @var boolean
	 */
	private $_cellCollectionIsSorted = false;

	/**
	 * Collection of breaks
	 *
	 * @var array
	 */
	private $_breaks = array();

	/**
	 * Collection of merged cell ranges
	 *
	 * @var array
	 */
	private $_mergeCells = array();

	/**
	 * Collection of protected cell ranges
	 *
	 * @var array
	 */
	private $_protectedCells = array();

	/**
	 * Autofilter Range
	 *
	 * @var string
	 */
	private $_autoFilter = '';

	/**
	 * Freeze pane
	 *
	 * @var string
	 */
	private $_freezePane = '';

	/**
	 * Show gridlines?
	 *
	 * @var boolean
	 */
	private $_showGridlines = true;

	/**
	* Print gridlines?
	*
	* @var boolean
	*/
	private $_printGridlines = false;

	/**
	* Show row and column headers?
	*
	* @var boolean
	*/
	private $_showRowColHeaders = true;

	/**
	 * Show summary below? (Row/Column outline)
	 *
	 * @var boolean
	 */
	private $_showSummaryBelow = true;

	/**
	 * Show summary right? (Row/Column outline)
	 *
	 * @var boolean
	 */
	private $_showSummaryRight = true;

	/**
	 * Collection of comments
	 *
	 * @var PHPExcel_Comment[]
	 */
	private $_comments = array();

	/**
	 * Active cell. (Only one!)
	 *
	 * @var string
	 */
	private $_activeCell = 'A1';

	/**
	 * Selected cells
	 *
	 * @var string
	 */
	private $_selectedCells = 'A1';

	/**
	 * Cached highest column
	 *
	 * @var string
	 */
	private $_cachedHighestColumn = 'A';

	/**
	 * Cached highest row
	 *
	 * @var int
	 */
	private $_cachedHighestRow = 1;

	/**
	 * Right-to-left?
	 *
	 * @var boolean
	 */
	private $_rightToLeft = false;

	/**
	 * Hyperlinks. Indexed by cell coordinate, e.g. 'A1'
	 *
	 * @var array
	 */
	private $_hyperlinkCollection = array();

	/**
	 * Data validation objects. Indexed by cell coordinate, e.g. 'A1'
	 *
	 * @var array
	 */
	private $_dataValidationCollection = array();

	/**
	 * Tab color
	 *
	 * @var PHPExcel_Style_Color
	 */
	private $_tabColor;

	/**
	 * Dirty flag
	 *
	 * @var boolean
	 */
	private $_dirty	= true;

	/**
	 * Hash
	 *
	 * @var string
	 */
	private $_hash	= null;

	/**
	 * Create a new worksheet
	 *
	 * @param PHPExcel		$pParent
	 * @param string		$pTitle
	 */
	public function __construct(PHPExcel $pParent = null, $pTitle = 'Worksheet')
	{
		// Set parent and title
		$this->_parent = $pParent;
		$this->setTitle($pTitle);
		$this->setSheetState(PHPExcel_Worksheet::SHEETSTATE_VISIBLE);

		$this->_cellCollection		= PHPExcel_CachedObjectStorageFactory::getInstance($this);

		// Set page setup
		$this->_pageSetup			= new PHPExcel_Worksheet_PageSetup();

		// Set page margins
		$this->_pageMargins			= new PHPExcel_Worksheet_PageMargins();

		// Set page header/footer
		$this->_headerFooter		= new PHPExcel_Worksheet_HeaderFooter();

		// Set sheet view
		$this->_sheetView			= new PHPExcel_Worksheet_SheetView();

		// Drawing collection
		$this->_drawingCollection	= new ArrayObject();

		// Protection
		$this->_protection			= new PHPExcel_Worksheet_Protection();

		// Default row dimension
		$this->_defaultRowDimension = new PHPExcel_Worksheet_RowDimension(null);

		// Default column dimension
		$this->_defaultColumnDimension = new PHPExcel_Worksheet_ColumnDimension(null);
	}


	public function disconnectCells() {
		$this->_cellCollection->unsetWorksheetCells();
		$this->_cellCollection = null;

		//	detach ourself from the workbook, so that it can then delete this worksheet successfully
		$this->_parent = null;
	}

	/**
	 * Return the cache controller for the cell collection
	 *
	 * @return PHPExcel_CachedObjectStorage_xxx
	 */
	public function getCellCacheController() {
		return $this->_cellCollection;
	}	//	function getCellCacheController()


	/**
	 * Get array of invalid characters for sheet title
	 *
	 * @return array
	 */
	public static function getInvalidCharacters()
	{
		return self::$_invalidCharacters;
	}

	/**
	 * Check sheet title for valid Excel syntax
	 *
	 * @param string $pValue The string to check
	 * @return string The valid string
	 * @throws Exception
	 */
	private static function _checkSheetTitle($pValue)
	{
		// Some of the printable ASCII characters are invalid:  * : / \ ? [ ]
		if (str_replace(self::$_invalidCharacters, '', $pValue) !== $pValue) {
			throw new Exception('Invalid character found in sheet title');
		}

		// Maximum 31 characters allowed for sheet title
		if (PHPExcel_Shared_String::CountCharacters($pValue) > 31) {
			throw new Exception('Maximum 31 characters allowed in sheet title.');
		}

		return $pValue;
	}

	/**
	 * Get collection of cells
	 *
	 * @param boolean $pSorted Also sort the cell collection?
	 * @return PHPExcel_Cell[]
	 */
	public function getCellCollection($pSorted = true)
	{
		if ($pSorted) {
			// Re-order cell collection
			return $this->sortCellCollection();
		}
		if (!is_null($this->_cellCollection)) {
			return $this->_cellCollection->getCellList();
		}
		return array();
	}

	/**
	 * Sort collection of cells
	 *
	 * @return PHPExcel_Worksheet
	 */
	public function sortCellCollection()
	{
		if (!is_null($this->_cellCollection)) {
			return $this->_cellCollection->getSortedCellList();
		}
		return array();
	}

	/**
	 * Get collection of row dimensions
	 *
	 * @return PHPExcel_Worksheet_RowDimension[]
	 */
	public function getRowDimensions()
	{
		return $this->_rowDimensions;
	}

	/**
	 * Get default row dimension
	 *
	 * @return PHPExcel_Worksheet_RowDimension
	 */
	public function getDefaultRowDimension()
	{
		return $this->_defaultRowDimension;
	}

	/**
	 * Get collection of column dimensions
	 *
	 * @return PHPExcel_Worksheet_ColumnDimension[]
	 */
	public function getColumnDimensions()
	{
		return $this->_columnDimensions;
	}

	/**
	 * Get default column dimension
	 *
	 * @return PHPExcel_Worksheet_ColumnDimension
	 */
	public function getDefaultColumnDimension()
	{
		return $this->_defaultColumnDimension;
	}

	/**
	 * Get collection of drawings
	 *
	 * @return PHPExcel_Worksheet_BaseDrawing[]
	 */
	public function getDrawingCollection()
	{
		return $this->_drawingCollection;
	}

	/**
	 * Refresh column dimensions
	 *
	 * @return PHPExcel_Worksheet
	 */
	public function refreshColumnDimensions()
	{
		$currentColumnDimensions = $this->getColumnDimensions();
		$newColumnDimensions = array();

		foreach ($currentColumnDimensions as $objColumnDimension) {
			$newColumnDimensions[$objColumnDimension->getColumnIndex()] = $objColumnDimension;
		}

		$this->_columnDimensions = $newColumnDimensions;

		return $this;
	}

	/**
	 * Refresh row dimensions
	 *
	 * @return PHPExcel_Worksheet
	 */
	public function refreshRowDimensions()
	{
		$currentRowDimensions = $this->getRowDimensions();
		$newRowDimensions = array();

		foreach ($currentRowDimensions as $objRowDimension) {
			$newRowDimensions[$objRowDimension->getRowIndex()] = $objRowDimension;
		}

		$this->_rowDimensions = $newRowDimensions;

		return $this;
	}

	/**
	 * Calculate worksheet dimension
	 *
	 * @return string  String containing the dimension of this worksheet
	 */
	public function calculateWorksheetDimension()
	{
		// Return
		return 'A1' . ':' .  $this->getHighestColumn() . $this->getHighestRow();
	}

	/**
	 * Calculate widths for auto-size columns
	 *
	 * @param  boolean  $calculateMergeCells  Calculate merge cell width
	 * @return PHPExcel_Worksheet;
	 */
	public function calculateColumnWidths($calculateMergeCells = false)
	{
		// initialize $autoSizes array
		$autoSizes = array();
		foreach ($this->getColumnDimensions() as $colDimension) {
			if ($colDimension->getAutoSize()) {
				$autoSizes[$colDimension->getColumnIndex()] = -1;
			}
		}

		// There is only something to do if there are some auto-size columns
		if (!empty($autoSizes)) {

			// build list of cells references that participate in a merge
			$isMergeCell = array();
			foreach ($this->getMergeCells() as $cells) {
				foreach (PHPExcel_Cell::extractAllCellReferencesInRange($cells) as $cellReference) {
					$isMergeCell[$cellReference] = true;
				}
			}

			// loop through all cells in the worksheet
			foreach ($this->getCellCollection(false) as $cellID) {
				$cell = $this->getCell($cellID);
				if (isset($autoSizes[$cell->getColumn()])) {
					// Determine width if cell does not participate in a merge
					if (!isset($isMergeCell[$cell->getCoordinate()])) {
						// Calculated value
						$cellValue = $cell->getCalculatedValue();

						// To formatted string
						$cellValue = PHPExcel_Style_NumberFormat::toFormattedString($cellValue, $this->getParent()->getCellXfByIndex($cell->getXfIndex())->getNumberFormat()->getFormatCode());

						$autoSizes[$cell->getColumn()] = max(
							(float)$autoSizes[$cell->getColumn()],
							(float)PHPExcel_Shared_Font::calculateColumnWidth(
								$this->getParent()->getCellXfByIndex($cell->getXfIndex())->getFont(),
								$cellValue,
								$this->getParent()->getCellXfByIndex($cell->getXfIndex())->getAlignment()->getTextRotation(),
								$this->getDefaultStyle()->getFont()
							)
						);
					}
				}
			}

			// adjust column widths
			foreach ($autoSizes as $columnIndex => $width) {
				if ($width == -1) $width = $this->getDefaultColumnDimension()->getWidth();
				$this->getColumnDimension($columnIndex)->setWidth($width);
			}
		}

		return $this;
	}

	/**
	 * Get parent
	 *
	 * @return PHPExcel
	 */
	public function getParent() {
		return $this->_parent;
	}

	/**
	 * Re-bind parent
	 *
	 * @param PHPExcel $parent
	 * @return PHPExcel_Worksheet
	 */
	public function rebindParent(PHPExcel $parent) {
		$namedRanges = $this->_parent->getNamedRanges();
		foreach ($namedRanges as $namedRange) {
			$parent->addNamedRange($namedRange);
		}

		$this->_parent->removeSheetByIndex(
			$this->_parent->getIndex($this)
		);
		$this->_parent = $parent;

		return $this;
	}

	/**
	 * Get title
	 *
	 * @return string
	 */
	public function getTitle()
	{
		return $this->_title;
	}

	/**
	 * Set title
	 *
	 * @param string $pValue String containing the dimension of this worksheet
	 * @return PHPExcel_Worksheet
	 */
	public function setTitle($pValue = 'Worksheet')
	{
		// Is this a 'rename' or not?
		if ($this->getTitle() == $pValue) {
			return $this;
		}

		// Syntax check
		self::_checkSheetTitle($pValue);

		// Old title
		$oldTitle = $this->getTitle();

		// Is there already such sheet name?
		if ($this->getParent()->getSheetByName($pValue)) {
			// Use name, but append with lowest possible integer

			if (PHPExcel_Shared_String::CountCharacters($pValue) > 29) {
				$pValue = PHPExcel_Shared_String::Substring($pValue,0,29);
			}
			$i = 1;
			while ($this->getParent()->getSheetByName($pValue . ' ' . $i)) {
				++$i;
				if ($i == 10) {
					if (PHPExcel_Shared_String::CountCharacters($pValue) > 28) {
						$pValue = PHPExcel_Shared_String::Substring($pValue,0,28);
					}
				} elseif ($i == 100) {
					if (PHPExcel_Shared_String::CountCharacters($pValue) > 27) {
						$pValue = PHPExcel_Shared_String::Substring($pValue,0,27);
					}
				}
			}

			$altTitle = $pValue . ' ' . $i;
			return $this->setTitle($altTitle);
		}

		// Set title
		$this->_title = $pValue;
		$this->_dirty = true;

		// New title
		$newTitle = $this->getTitle();
		PHPExcel_ReferenceHelper::getInstance()->updateNamedFormulas($this->getParent(), $oldTitle, $newTitle);

		return $this;
	}

	/**
	 * Get sheet state
	 *
	 * @return string Sheet state (visible, hidden, veryHidden)
	 */
	public function getSheetState() {
		return $this->_sheetState;
	}

	/**
	 * Set sheet state
	 *
	 * @param string $value Sheet state (visible, hidden, veryHidden)
	 * @return PHPExcel_Worksheet
	 */
	public function setSheetState($value = PHPExcel_Worksheet::SHEETSTATE_VISIBLE) {
		$this->_sheetState = $value;
		return $this;
	}

	/**
	 * Get page setup
	 *
	 * @return PHPExcel_Worksheet_PageSetup
	 */
	public function getPageSetup()
	{
		return $this->_pageSetup;
	}

	/**
	 * Set page setup
	 *
	 * @param PHPExcel_Worksheet_PageSetup	$pValue
	 * @return PHPExcel_Worksheet
	 */
	public function setPageSetup(PHPExcel_Worksheet_PageSetup $pValue)
	{
		$this->_pageSetup = $pValue;
		return $this;
	}

	/**
	 * Get page margins
	 *
	 * @return PHPExcel_Worksheet_PageMargins
	 */
	public function getPageMargins()
	{
		return $this->_pageMargins;
	}

	/**
	 * Set page margins
	 *
	 * @param PHPExcel_Worksheet_PageMargins	$pValue
	 * @return PHPExcel_Worksheet
	 */
	public function setPageMargins(PHPExcel_Worksheet_PageMargins $pValue)
	{
		$this->_pageMargins = $pValue;
		return $this;
	}

	/**
	 * Get page header/footer
	 *
	 * @return PHPExcel_Worksheet_HeaderFooter
	 */
	public function getHeaderFooter()
	{
		return $this->_headerFooter;
	}

	/**
	 * Set page header/footer
	 *
	 * @param PHPExcel_Worksheet_HeaderFooter	$pValue
	 * @return PHPExcel_Worksheet
	 */
	public function setHeaderFooter(PHPExcel_Worksheet_HeaderFooter $pValue)
	{
		$this->_headerFooter = $pValue;
		return $this;
	}

	/**
	 * Get sheet view
	 *
	 * @return PHPExcel_Worksheet_HeaderFooter
	 */
	public function getSheetView()
	{
		return $this->_sheetView;
	}

	/**
	 * Set sheet view
	 *
	 * @param PHPExcel_Worksheet_SheetView	$pValue
	 * @return PHPExcel_Worksheet
	 */
	public function setSheetView(PHPExcel_Worksheet_SheetView $pValue)
	{
		$this->_sheetView = $pValue;
		return $this;
	}

	/**
	 * Get Protection
	 *
	 * @return PHPExcel_Worksheet_Protection
	 */
	public function getProtection()
	{
		return $this->_protection;
	}

	/**
	 * Set Protection
	 *
	 * @param PHPExcel_Worksheet_Protection	$pValue
	 * @return PHPExcel_Worksheet
	 */
	public function setProtection(PHPExcel_Worksheet_Protection $pValue)
	{
		$this->_protection = $pValue;
		$this->_dirty = true;

		return $this;
	}

	/**
	 * Get highest worksheet column
	 *
	 * @return string Highest column name
	 */
	public function getHighestColumn()
	{
		return $this->_cachedHighestColumn;
	}

	/**
	 * Get highest worksheet row
	 *
	 * @return int Highest row number
	 */
	public function getHighestRow()
	{
		return $this->_cachedHighestRow;
	}

	/**
	 * Set a cell value
	 *
	 * @param string	$pCoordinate	Coordinate of the cell
	 * @param mixed	$pValue			Value of the cell
	 * @param bool		$returnCell		Return the worksheet (false, default) or the cell (true)
	 * @return PHPExcel_Worksheet|PHPExcel_Cell	Depending on the last parameter being specified
	 */
	public function setCellValue($pCoordinate = 'A1', $pValue = null, $returnCell = false)
	{
		$cell = $this->getCell($pCoordinate);
		$cell->setValue($pValue);

		if ($returnCell) {
			return $cell;
		}
		return $this;
	}

	/**
	 * Set a cell value by using numeric cell coordinates
	 *
	 * @param string	$pColumn		Numeric column coordinate of the cell
	 * @param string	$pRow			Numeric row coordinate of the cell
	 * @param mixed		$pValue			Value of the cell
	 * @param bool		$returnCell		Return the worksheet (false, default) or the cell (true)
	 * @return PHPExcel_Worksheet|PHPExcel_Cell	Depending on the last parameter being specified
	 */
	public function setCellValueByColumnAndRow($pColumn = 0, $pRow = 1, $pValue = null, $returnCell = false)
	{
		$cell = $this->getCell(PHPExcel_Cell::stringFromColumnIndex($pColumn) . $pRow);
		$cell->setValue($pValue);

		if ($returnCell) {
			return $cell;
		}
		return $this;
	}

	/**
	 * Set a cell value
	 *
	 * @param string	$pCoordinate	Coordinate of the cell
	 * @param mixed	$pValue			Value of the cell
	 * @param string	$pDataType		Explicit data type
	 * @return PHPExcel_Worksheet
	 */
	public function setCellValueExplicit($pCoordinate = 'A1', $pValue = null, $pDataType = PHPExcel_Cell_DataType::TYPE_STRING)
	{
		// Set value
		$this->getCell($pCoordinate)->setValueExplicit($pValue, $pDataType);
		return $this;
	}

	/**
	 * Set a cell value by using numeric cell coordinates
	 *
	 * @param string	$pColumn		Numeric column coordinate of the cell
	 * @param string	$pRow			Numeric row coordinate of the cell
	 * @param mixed		$pValue			Value of the cell
	 * @param string	$pDataType		Explicit data type
	 * @return PHPExcel_Worksheet
	 */
	public function setCellValueExplicitByColumnAndRow($pColumn = 0, $pRow = 1, $pValue = null, $pDataType = PHPExcel_Cell_DataType::TYPE_STRING)
	{
		return $this->getCell(PHPExcel_Cell::stringFromColumnIndex($pColumn) . $pRow)->setValueExplicit($pValue, $pDataType);
	}

	/**
	 * Get cell at a specific coordinate
	 *
	 * @param	string			$pCoordinate	Coordinate of the cell
	 * @throws	Exception
	 * @return	PHPExcel_Cell	Cell that was found
	 */
	public function getCell($pCoordinate = 'A1')
	{
		// Check cell collection
		if ($this->_cellCollection->isDataSet($pCoordinate)) {
			return $this->_cellCollection->getCacheData($pCoordinate);
		}

		// Worksheet reference?
		if (strpos($pCoordinate, '!') !== false) {
			$worksheetReference = PHPExcel_Worksheet::extractSheetTitle($pCoordinate, true);
			return $this->getParent()->getSheetByName($worksheetReference[0])->getCell($worksheetReference[1]);
		}

		// Named range?
		if ((!preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_CELLREF.'$/i', $pCoordinate, $matches)) &&
			(preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_NAMEDRANGE.'$/i', $pCoordinate, $matches))) {
			$namedRange = PHPExcel_NamedRange::resolveRange($pCoordinate, $this);
			if (!is_null($namedRange)) {
				$pCoordinate = $namedRange->getRange();
				return $namedRange->getWorksheet()->getCell($pCoordinate);
			}
		}

		// Uppercase coordinate
		$pCoordinate = strtoupper($pCoordinate);

		if (strpos($pCoordinate,':') !== false || strpos($pCoordinate,',') !== false) {
			throw new Exception('Cell coordinate can not be a range of cells.');
		} elseif (strpos($pCoordinate,'$') !== false) {
			throw new Exception('Cell coordinate must not be absolute.');
		} else {
			// Create new cell object

			// Coordinates
			$aCoordinates = PHPExcel_Cell::coordinateFromString($pCoordinate);

			$cell = $this->_cellCollection->addCacheData($pCoordinate,new PHPExcel_Cell($aCoordinates[0], $aCoordinates[1], null, PHPExcel_Cell_DataType::TYPE_NULL, $this));
			$this->_cellCollectionIsSorted = false;

			if (PHPExcel_Cell::columnIndexFromString($this->_cachedHighestColumn) < PHPExcel_Cell::columnIndexFromString($aCoordinates[0]))
				$this->_cachedHighestColumn = $aCoordinates[0];

			$this->_cachedHighestRow = max($this->_cachedHighestRow,$aCoordinates[1]);

			// Cell needs appropriate xfIndex
			$rowDimensions	= $this->getRowDimensions();
			$columnDimensions = $this->getColumnDimensions();

			if ( isset($rowDimensions[$aCoordinates[1]]) && $rowDimensions[$aCoordinates[1]]->getXfIndex() !== null ) {
				// then there is a row dimension with explicit style, assign it to the cell
				$cell->setXfIndex($rowDimensions[$aCoordinates[1]]->getXfIndex());
			} else if ( isset($columnDimensions[$aCoordinates[0]]) ) {
				// then there is a column dimension, assign it to the cell
				$cell->setXfIndex($columnDimensions[$aCoordinates[0]]->getXfIndex());
			} else {
				// set to default index
				$cell->setXfIndex(0);
			}

			return $cell;
		}
	}

	/**
	 * Get cell at a specific coordinate by using numeric cell coordinates
	 *
	 * @param	string $pColumn		Numeric column coordinate of the cell
	 * @param	string $pRow		Numeric row coordinate of the cell
	 * @return	PHPExcel_Cell		Cell that was found
	 */
	public function getCellByColumnAndRow($pColumn = 0, $pRow = 1)
	{
		$columnLetter = PHPExcel_Cell::stringFromColumnIndex($pColumn);
		$coordinate = $columnLetter . $pRow;

		if (!$this->_cellCollection->isDataSet($coordinate)) {
			$cell = $this->_cellCollection->addCacheData($coordinate, new PHPExcel_Cell($columnLetter, $pRow, null, PHPExcel_Cell_DataType::TYPE_NULL, $this));
			$this->_cellCollectionIsSorted = false;

			if (PHPExcel_Cell::columnIndexFromString($this->_cachedHighestColumn) < $pColumn)
				$this->_cachedHighestColumn = $columnLetter;

			$this->_cachedHighestRow = max($this->_cachedHighestRow,$pRow);

			return $cell;
		}

		return $this->_cellCollection->getCacheData($coordinate);
	}

	/**
	 * Cell at a specific coordinate exists?
	 *
	 * @param	string			$pCoordinate	Coordinate of the cell
	 * @throws	Exception
	 * @return	boolean
	 */
	public function cellExists($pCoordinate = 'A1')
	{
		// Worksheet reference?
		if (strpos($pCoordinate, '!') !== false) {
			$worksheetReference = PHPExcel_Worksheet::extractSheetTitle($pCoordinate, true);
			return $this->getParent()->getSheetByName($worksheetReference[0])->cellExists($worksheetReference[1]);
		}

		// Named range?
		if ((!preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_CELLREF.'$/i', $pCoordinate, $matches)) &&
			(preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_NAMEDRANGE.'$/i', $pCoordinate, $matches))) {
			$namedRange = PHPExcel_NamedRange::resolveRange($pCoordinate, $this);
			if (!is_null($namedRange)) {
				$pCoordinate = $namedRange->getRange();
				if ($this->getHashCode() != $namedRange->getWorksheet()->getHashCode()) {
					if (!$namedRange->getLocalOnly()) {
						return $namedRange->getWorksheet()->cellExists($pCoordinate);
					} else {
						throw new Exception('Named range ' . $namedRange->getName() . ' is not accessible from within sheet ' . $this->getTitle());
					}
				}
			}
		}

		// Uppercase coordinate
		$pCoordinate = strtoupper($pCoordinate);

		if (strpos($pCoordinate,':') !== false || strpos($pCoordinate,',') !== false) {
			throw new Exception('Cell coordinate can not be a range of cells.');
		} elseif (strpos($pCoordinate,'$') !== false) {
			throw new Exception('Cell coordinate must not be absolute.');
		} else {
			// Coordinates
			$aCoordinates = PHPExcel_Cell::coordinateFromString($pCoordinate);

			// Cell exists?
			return $this->_cellCollection->isDataSet($pCoordinate);
		}
	}

	/**
	 * Cell at a specific coordinate by using numeric cell coordinates exists?
	 *
	 * @param	string $pColumn		Numeric column coordinate of the cell
	 * @param	string $pRow		Numeric row coordinate of the cell
	 * @return	boolean
	 */
	public function cellExistsByColumnAndRow($pColumn = 0, $pRow = 1)
	{
		return $this->cellExists(PHPExcel_Cell::stringFromColumnIndex($pColumn) . $pRow);
	}

	/**
	 * Get row dimension at a specific row
	 *
	 * @param int $pRow	Numeric index of the row
	 * @return PHPExcel_Worksheet_RowDimension
	 */
	public function getRowDimension($pRow = 1)
	{
		// Found
		$found = null;

		// Get row dimension
		if (!isset($this->_rowDimensions[$pRow])) {
			$this->_rowDimensions[$pRow] = new PHPExcel_Worksheet_RowDimension($pRow);

			$this->_cachedHighestRow = max($this->_cachedHighestRow,$pRow);
		}
		return $this->_rowDimensions[$pRow];
	}

	/**
	 * Get column dimension at a specific column
	 *
	 * @param string $pColumn	String index of the column
	 * @return PHPExcel_Worksheet_ColumnDimension
	 */
	public function getColumnDimension($pColumn = 'A')
	{
		// Uppercase coordinate
		$pColumn = strtoupper($pColumn);

		// Fetch dimensions
		if (!isset($this->_columnDimensions[$pColumn])) {
			$this->_columnDimensions[$pColumn] = new PHPExcel_Worksheet_ColumnDimension($pColumn);

			if (PHPExcel_Cell::columnIndexFromString($this->_cachedHighestColumn) < PHPExcel_Cell::columnIndexFromString($pColumn))
				$this->_cachedHighestColumn = $pColumn;
		}
		return $this->_columnDimensions[$pColumn];
	}

	/**
	 * Get column dimension at a specific column by using numeric cell coordinates
	 *
	 * @param	string $pColumn		Numeric column coordinate of the cell
	 * @param	string $pRow		Numeric row coordinate of the cell
	 * @return	PHPExcel_Worksheet_ColumnDimension
	 */
	public function getColumnDimensionByColumn($pColumn = 0)
	{
		return $this->getColumnDimension(PHPExcel_Cell::stringFromColumnIndex($pColumn));
	}

	/**
	 * Get styles
	 *
	 * @return PHPExcel_Style[]
	 */
	public function getStyles()
	{
		return $this->_styles;
	}

	/**
	 * Get default style of workbork.
	 *
	 * @deprecated
	 * @return	PHPExcel_Style
	 * @throws	Exception
	 */
	public function getDefaultStyle()
	{
		return $this->_parent->getDefaultStyle();
	}

	/**
	 * Set default style - should only be used by PHPExcel_IReader implementations!
	 *
	 * @deprecated
	 * @param	PHPExcel_Style $value
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function setDefaultStyle(PHPExcel_Style $pValue)
	{
		$this->_parent->getDefaultStyle()->applyFromArray(array(
			'font' => array(
				'name' => $pValue->getFont()->getName(),
				'size' => $pValue->getFont()->getSize(),
			),
		));
		return $this;
	}

	/**
	 * Get style for cell
	 *
	 * @param	string	$pCellCoordinate	Cell coordinate to get style for
	 * @return	PHPExcel_Style
	 * @throws	Exception
	 */
	public function getStyle($pCellCoordinate = 'A1')
	{
		// set this sheet as active
		$this->_parent->setActiveSheetIndex($this->_parent->getIndex($this));

		// set cell coordinate as active
		$this->setSelectedCells($pCellCoordinate);

		return $this->_parent->getCellXfSupervisor();
	}

	/**
	 * Get conditional styles for a cell
	 *
	 * @param string $pCoordinate
	 * @return PHPExcel_Style_Conditional[]
	 */
	public function getConditionalStyles($pCoordinate = 'A1')
	{
		if (!isset($this->_conditionalStylesCollection[$pCoordinate])) {
			$this->_conditionalStylesCollection[$pCoordinate] = array();
		}
		return $this->_conditionalStylesCollection[$pCoordinate];
	}

	/**
	 * Do conditional styles exist for this cell?
	 *
	 * @param string $pCoordinate
	 * @return boolean
	 */
	public function conditionalStylesExists($pCoordinate = 'A1')
	{
		if (isset($this->_conditionalStylesCollection[$pCoordinate])) {
			return true;
		}
		return false;
	}

	/**
	 * Removes conditional styles for a cell
	 *
	 * @param string $pCoordinate
	 * @return PHPExcel_Worksheet
	 */
	public function removeConditionalStyles($pCoordinate = 'A1')
	{
		unset($this->_conditionalStylesCollection[$pCoordinate]);
		return $this;
	}

	/**
	 * Get collection of conditional styles
	 *
	 * @return array
	 */
	public function getConditionalStylesCollection()
	{
		return $this->_conditionalStylesCollection;
	}

	/**
	 * Set conditional styles
	 *
	 * @param $pCoordinate string E.g. 'A1'
	 * @param $pValue PHPExcel_Style_Conditional[]
	 * @return PHPExcel_Worksheet
	 */
	public function setConditionalStyles($pCoordinate = 'A1', $pValue)
	{
		$this->_conditionalStylesCollection[$pCoordinate] = $pValue;
		return $this;
	}

	/**
	 * Get style for cell by using numeric cell coordinates
	 *
	 * @param	int $pColumn	Numeric column coordinate of the cell
	 * @param	int $pRow		Numeric row coordinate of the cell
	 * @return	PHPExcel_Style
	 */
	public function getStyleByColumnAndRow($pColumn = 0, $pRow = 1)
	{
		return $this->getStyle(PHPExcel_Cell::stringFromColumnIndex($pColumn) . $pRow);
	}

	/**
	 * Set shared cell style to a range of cells
	 *
	 * Please note that this will overwrite existing cell styles for cells in range!
	 *
	 * @deprecated
	 * @param	PHPExcel_Style	$pSharedCellStyle	Cell style to share
	 * @param	string			$pRange				Range of cells (i.e. "A1:B10"), or just one cell (i.e. "A1")
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	 public function setSharedStyle(PHPExcel_Style $pSharedCellStyle = null, $pRange = '')
	{
		$this->duplicateStyle($pSharedCellStyle, $pRange);
		return $this;
	}

	/**
	 * Duplicate cell style to a range of cells
	 *
	 * Please note that this will overwrite existing cell styles for cells in range!
	 *
	 * @param	PHPExcel_Style	$pCellStyle	Cell style to duplicate
	 * @param	string			$pRange		Range of cells (i.e. "A1:B10"), or just one cell (i.e. "A1")
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function duplicateStyle(PHPExcel_Style $pCellStyle = null, $pRange = '')
	{
		// make sure we have a real style and not supervisor
		$style = $pCellStyle->getIsSupervisor() ? $pCellStyle->getSharedComponent() : $pCellStyle;

		// Add the style to the workbook if necessary
		$workbook = $this->_parent;
		if ($existingStyle = $this->_parent->getCellXfByHashCode($pCellStyle->getHashCode())) {
			// there is already such cell Xf in our collection
			$xfIndex = $existingStyle->getIndex();
		} else {
			// we don't have such a cell Xf, need to add
			$workbook->addCellXf($pCellStyle);
			$xfIndex = $pCellStyle->getIndex();
		}

		// Uppercase coordinate
		$pRange = strtoupper($pRange);

		// Is it a cell range or a single cell?
		$rangeA	= '';
		$rangeB	= '';
		if (strpos($pRange, ':') === false) {
			$rangeA = $pRange;
			$rangeB = $pRange;
		} else {
			list($rangeA, $rangeB) = explode(':', $pRange);
		}

		// Calculate range outer borders
		$rangeStart = PHPExcel_Cell::coordinateFromString($rangeA);
		$rangeEnd	= PHPExcel_Cell::coordinateFromString($rangeB);

		// Translate column into index
		$rangeStart[0]	= PHPExcel_Cell::columnIndexFromString($rangeStart[0]) - 1;
		$rangeEnd[0]	= PHPExcel_Cell::columnIndexFromString($rangeEnd[0]) - 1;

		// Make sure we can loop upwards on rows and columns
		if ($rangeStart[0] > $rangeEnd[0] && $rangeStart[1] > $rangeEnd[1]) {
			$tmp = $rangeStart;
			$rangeStart = $rangeEnd;
			$rangeEnd = $tmp;
		}

		// Loop through cells and apply styles
		for ($col = $rangeStart[0]; $col <= $rangeEnd[0]; ++$col) {
			for ($row = $rangeStart[1]; $row <= $rangeEnd[1]; ++$row) {
				$this->getCell(PHPExcel_Cell::stringFromColumnIndex($col) . $row)->setXfIndex($xfIndex);
			}
		}

		return $this;
	}

	/**
	 * Duplicate cell style array to a range of cells
	 *
	 * Please note that this will overwrite existing cell styles for cells in range,
	 * if they are in the styles array. For example, if you decide to set a range of
	 * cells to font bold, only include font bold in the styles array.
	 *
	 * @deprecated
	 * @param	array			$pStyles	Array containing style information
	 * @param	string			$pRange		Range of cells (i.e. "A1:B10"), or just one cell (i.e. "A1")
	 * @param	boolean			$pAdvanced	Advanced mode for setting borders.
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function duplicateStyleArray($pStyles = null, $pRange = '', $pAdvanced = true)
	{
		$this->getStyle($pRange)->applyFromArray($pStyles, $pAdvanced);
		return $this;
	}

	/**
	 * Set break on a cell
	 *
	 * @param	string			$pCell		Cell coordinate (e.g. A1)
	 * @param	int				$pBreak		Break type (type of PHPExcel_Worksheet::BREAK_*)
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function setBreak($pCell = 'A1', $pBreak = PHPExcel_Worksheet::BREAK_NONE)
	{
		// Uppercase coordinate
		$pCell = strtoupper($pCell);

		if ($pCell != '') {
			$this->_breaks[$pCell] = $pBreak;
		} else {
			throw new Exception('No cell coordinate specified.');
		}

		return $this;
	}

	/**
	 * Set break on a cell by using numeric cell coordinates
	 *
	 * @param	integer	$pColumn	Numeric column coordinate of the cell
	 * @param	integer	$pRow		Numeric row coordinate of the cell
	 * @param	integer	$pBreak		Break type (type of PHPExcel_Worksheet::BREAK_*)
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function setBreakByColumnAndRow($pColumn = 0, $pRow = 1, $pBreak = PHPExcel_Worksheet::BREAK_NONE)
	{
		return $this->setBreak(PHPExcel_Cell::stringFromColumnIndex($pColumn) . $pRow, $pBreak);
	}

	/**
	 * Get breaks
	 *
	 * @return array[]
	 */
	public function getBreaks()
	{
		return $this->_breaks;
	}

	/**
	 * Set merge on a cell range
	 *
	 * @param	string			$pRange		Cell range (e.g. A1:E1)
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function mergeCells($pRange = 'A1:A1')
	{
		// Uppercase coordinate
		$pRange = strtoupper($pRange);

		if (strpos($pRange,':') !== false) {
			$this->_mergeCells[$pRange] = $pRange;

			// make sure cells are created

			// get the cells in the range
			$aReferences = PHPExcel_Cell::extractAllCellReferencesInRange($pRange);

			// create upper left cell if it does not already exist
			$upperLeft = $aReferences[0];
			if (!$this->cellExists($upperLeft)) {
				$this->getCell($upperLeft)->setValueExplicit(null, PHPExcel_Cell_DataType::TYPE_NULL);
			}

			// create or blank out the rest of the cells in the range
			$count = count($aReferences);
			for ($i = 1; $i < $count; $i++) {
				$this->getCell($aReferences[$i])->setValueExplicit(null, PHPExcel_Cell_DataType::TYPE_NULL);
			}

		} else {
			throw new Exception('Merge must be set on a range of cells.');
		}

		return $this;
	}

	/**
	 * Set merge on a cell range by using numeric cell coordinates
	 *
	 * @param	int $pColumn1	Numeric column coordinate of the first cell
	 * @param	int $pRow1		Numeric row coordinate of the first cell
	 * @param	int $pColumn2	Numeric column coordinate of the last cell
	 * @param	int $pRow2		Numeric row coordinate of the last cell
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function mergeCellsByColumnAndRow($pColumn1 = 0, $pRow1 = 1, $pColumn2 = 0, $pRow2 = 1)
	{
		$cellRange = PHPExcel_Cell::stringFromColumnIndex($pColumn1) . $pRow1 . ':' . PHPExcel_Cell::stringFromColumnIndex($pColumn2) . $pRow2;
		return $this->mergeCells($cellRange);
	}

	/**
	 * Remove merge on a cell range
	 *
	 * @param	string			$pRange		Cell range (e.g. A1:E1)
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function unmergeCells($pRange = 'A1:A1')
	{
		// Uppercase coordinate
		$pRange = strtoupper($pRange);

		if (strpos($pRange,':') !== false) {
			if (isset($this->_mergeCells[$pRange])) {
				unset($this->_mergeCells[$pRange]);
			} else {
				throw new Exception('Cell range ' . $pRange . ' not known as merged.');
			}
		} else {
			throw new Exception('Merge can only be removed from a range of cells.');
		}

		return $this;
	}

	/**
	 * Remove merge on a cell range by using numeric cell coordinates
	 *
	 * @param	int $pColumn1	Numeric column coordinate of the first cell
	 * @param	int $pRow1		Numeric row coordinate of the first cell
	 * @param	int $pColumn2	Numeric column coordinate of the last cell
	 * @param	int $pRow2		Numeric row coordinate of the last cell
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function unmergeCellsByColumnAndRow($pColumn1 = 0, $pRow1 = 1, $pColumn2 = 0, $pRow2 = 1)
	{
		$cellRange = PHPExcel_Cell::stringFromColumnIndex($pColumn1) . $pRow1 . ':' . PHPExcel_Cell::stringFromColumnIndex($pColumn2) . $pRow2;
		return $this->unmergeCells($cellRange);
	}

	/**
	 * Get merge cells array.
	 *
	 * @return array[]
	 */
	public function getMergeCells()
	{
		return $this->_mergeCells;
	}

	/**
	 * Set merge cells array for the entire sheet. Use instead mergeCells() to merge
	 * a single cell range.
	 *
	 * @param array
	 */
	public function setMergeCells($pValue = array())
	{
		$this->_mergeCells = $pValue;

		return $this;
	}

	/**
	 * Set protection on a cell range
	 *
	 * @param	string			$pRange				Cell (e.g. A1) or cell range (e.g. A1:E1)
	 * @param	string			$pPassword			Password to unlock the protection
	 * @param	boolean		$pAlreadyHashed	If the password has already been hashed, set this to true
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function protectCells($pRange = 'A1', $pPassword = '', $pAlreadyHashed = false)
	{
		// Uppercase coordinate
		$pRange = strtoupper($pRange);

		if (!$pAlreadyHashed) {
			$pPassword = PHPExcel_Shared_PasswordHasher::hashPassword($pPassword);
		}
		$this->_protectedCells[$pRange] = $pPassword;

		return $this;
	}

	/**
	 * Set protection on a cell range by using numeric cell coordinates
	 *
	 * @param	int	$pColumn1			Numeric column coordinate of the first cell
	 * @param	int	$pRow1				Numeric row coordinate of the first cell
	 * @param	int	$pColumn2			Numeric column coordinate of the last cell
	 * @param	int	$pRow2				Numeric row coordinate of the last cell
	 * @param	string	$pPassword			Password to unlock the protection
	 * @param	boolean $pAlreadyHashed	If the password has already been hashed, set this to true
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function protectCellsByColumnAndRow($pColumn1 = 0, $pRow1 = 1, $pColumn2 = 0, $pRow2 = 1, $pPassword = '', $pAlreadyHashed = false)
	{
		$cellRange = PHPExcel_Cell::stringFromColumnIndex($pColumn1) . $pRow1 . ':' . PHPExcel_Cell::stringFromColumnIndex($pColumn2) . $pRow2;
		return $this->protectCells($cellRange, $pPassword, $pAlreadyHashed);
	}

	/**
	 * Remove protection on a cell range
	 *
	 * @param	string			$pRange		Cell (e.g. A1) or cell range (e.g. A1:E1)
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function unprotectCells($pRange = 'A1')
	{
		// Uppercase coordinate
		$pRange = strtoupper($pRange);

		if (isset($this->_protectedCells[$pRange])) {
			unset($this->_protectedCells[$pRange]);
		} else {
			throw new Exception('Cell range ' . $pRange . ' not known as protected.');
		}
		return $this;
	}

	/**
	 * Remove protection on a cell range by using numeric cell coordinates
	 *
	 * @param	int	$pColumn1			Numeric column coordinate of the first cell
	 * @param	int	$pRow1				Numeric row coordinate of the first cell
	 * @param	int	$pColumn2			Numeric column coordinate of the last cell
	 * @param	int	$pRow2				Numeric row coordinate of the last cell
	 * @param	string	$pPassword			Password to unlock the protection
	 * @param	boolean $pAlreadyHashed	If the password has already been hashed, set this to true
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function unprotectCellsByColumnAndRow($pColumn1 = 0, $pRow1 = 1, $pColumn2 = 0, $pRow2 = 1, $pPassword = '', $pAlreadyHashed = false)
	{
		$cellRange = PHPExcel_Cell::stringFromColumnIndex($pColumn1) . $pRow1 . ':' . PHPExcel_Cell::stringFromColumnIndex($pColumn2) . $pRow2;
		return $this->unprotectCells($cellRange, $pPassword, $pAlreadyHashed);
	}

	/**
	 * Get protected cells
	 *
	 * @return array[]
	 */
	public function getProtectedCells()
	{
		return $this->_protectedCells;
	}

	/**
	 * Get Autofilter Range
	 *
	 * @return string
	 */
	public function getAutoFilter()
	{
		return $this->_autoFilter;
	}

	/**
	 * Set Autofilter Range
	 *
	 * @param	string		$pRange		Cell range (i.e. A1:E10)
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function setAutoFilter($pRange = '')
	{
		// Uppercase coordinate
		$pRange = strtoupper($pRange);

		if (strpos($pRange,':') !== false) {
			$this->_autoFilter = $pRange;
			$this->_dirty = true;
		} else {
			throw new Exception('Autofilter must be set on a range of cells.');
		}
		return $this;
	}

	/**
	 * Set Autofilter Range by using numeric cell coordinates
	 *
	 * @param	int	$pColumn1	Numeric column coordinate of the first cell
	 * @param	int	$pRow1		Numeric row coordinate of the first cell
	 * @param	int	$pColumn2	Numeric column coordinate of the second cell
	 * @param	int	$pRow2		Numeric row coordinate of the second cell
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function setAutoFilterByColumnAndRow($pColumn1 = 0, $pRow1 = 1, $pColumn2 = 0, $pRow2 = 1)
	{
		return $this->setAutoFilter(
			PHPExcel_Cell::stringFromColumnIndex($pColumn1) . $pRow1
			. ':' .
			PHPExcel_Cell::stringFromColumnIndex($pColumn2) . $pRow2
		);
	}

    /**
     * Remove autofilter
     *
     * @return PHPExcel_Worksheet
     */
    public function removeAutoFilter()
    {
    	$this->_autoFilter = '';
    	return $this;
    }

	/**
	 * Get Freeze Pane
	 *
	 * @return string
	 */
	public function getFreezePane()
	{
		return $this->_freezePane;
	}

	/**
	 * Freeze Pane
	 *
	 * @param	string		$pCell		Cell (i.e. A1)
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function freezePane($pCell = '')
	{
		// Uppercase coordinate
		$pCell = strtoupper($pCell);

		if (strpos($pCell,':') === false && strpos($pCell,',') === false) {
			$this->_freezePane = $pCell;
		} else {
			throw new Exception('Freeze pane can not be set on a range of cells.');
		}
		return $this;
	}

	/**
	 * Freeze Pane by using numeric cell coordinates
	 *
	 * @param	int	$pColumn	Numeric column coordinate of the cell
	 * @param	int	$pRow		Numeric row coordinate of the cell
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function freezePaneByColumnAndRow($pColumn = 0, $pRow = 1)
	{
		return $this->freezePane(PHPExcel_Cell::stringFromColumnIndex($pColumn) . $pRow);
	}

	/**
	 * Unfreeze Pane
	 *
	 * @return PHPExcel_Worksheet
	 */
	public function unfreezePane()
	{
		return $this->freezePane('');
	}

	/**
	 * Insert a new row, updating all possible related data
	 *
	 * @param	int	$pBefore	Insert before this one
	 * @param	int	$pNumRows	Number of rows to insert
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function insertNewRowBefore($pBefore = 1, $pNumRows = 1) {
		if ($pBefore >= 1) {
			$objReferenceHelper = PHPExcel_ReferenceHelper::getInstance();
			$objReferenceHelper->insertNewBefore('A' . $pBefore, 0, $pNumRows, $this);
		} else {
			throw new Exception("Rows can only be inserted before at least row 1.");
		}
		return $this;
	}

	/**
	 * Insert a new column, updating all possible related data
	 *
	 * @param	int	$pBefore	Insert before this one
	 * @param	int	$pNumCols	Number of columns to insert
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function insertNewColumnBefore($pBefore = 'A', $pNumCols = 1) {
		if (!is_numeric($pBefore)) {
			$objReferenceHelper = PHPExcel_ReferenceHelper::getInstance();
			$objReferenceHelper->insertNewBefore($pBefore . '1', $pNumCols, 0, $this);
		} else {
			throw new Exception("Column references should not be numeric.");
		}
		return $this;
	}

	/**
	 * Insert a new column, updating all possible related data
	 *
	 * @param	int	$pBefore	Insert before this one (numeric column coordinate of the cell)
	 * @param	int	$pNumCols	Number of columns to insert
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function insertNewColumnBeforeByIndex($pBefore = 0, $pNumCols = 1) {
		if ($pBefore >= 0) {
			return $this->insertNewColumnBefore(PHPExcel_Cell::stringFromColumnIndex($pBefore), $pNumCols);
		} else {
			throw new Exception("Columns can only be inserted before at least column A (0).");
		}
	}

	/**
	 * Delete a row, updating all possible related data
	 *
	 * @param	int	$pRow		Remove starting with this one
	 * @param	int	$pNumRows	Number of rows to remove
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function removeRow($pRow = 1, $pNumRows = 1) {
		if ($pRow >= 1) {
			$objReferenceHelper = PHPExcel_ReferenceHelper::getInstance();
			$objReferenceHelper->insertNewBefore('A' . ($pRow + $pNumRows), 0, -$pNumRows, $this);
		} else {
			throw new Exception("Rows to be deleted should at least start from row 1.");
		}
		return $this;
	}

	/**
	 * Remove a column, updating all possible related data
	 *
	 * @param	int	$pColumn	Remove starting with this one
	 * @param	int	$pNumCols	Number of columns to remove
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function removeColumn($pColumn = 'A', $pNumCols = 1) {
		if (!is_numeric($pColumn)) {
			$pColumn = PHPExcel_Cell::stringFromColumnIndex(PHPExcel_Cell::columnIndexFromString($pColumn) - 1 + $pNumCols);
			$objReferenceHelper = PHPExcel_ReferenceHelper::getInstance();
			$objReferenceHelper->insertNewBefore($pColumn . '1', -$pNumCols, 0, $this);
		} else {
			throw new Exception("Column references should not be numeric.");
		}
		return $this;
	}

	/**
	 * Remove a column, updating all possible related data
	 *
	 * @param	int	$pColumn	Remove starting with this one (numeric column coordinate of the cell)
	 * @param	int	$pNumCols	Number of columns to remove
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function removeColumnByIndex($pColumn = 0, $pNumCols = 1) {
		if ($pColumn >= 0) {
			return $this->removeColumn(PHPExcel_Cell::stringFromColumnIndex($pColumn), $pNumCols);
		} else {
			throw new Exception("Columns to be deleted should at least start from column 0");
		}
	}

	/**
	 * Show gridlines?
	 *
	 * @return boolean
	 */
	public function getShowGridlines() {
		return $this->_showGridlines;
	}

	/**
	 * Set show gridlines
	 *
	 * @param boolean $pValue	Show gridlines (true/false)
	 * @return PHPExcel_Worksheet
	 */
	public function setShowGridlines($pValue = false) {
		$this->_showGridlines = $pValue;
		return $this;
	}

	/**
	* Print gridlines?
	*
	* @return boolean
	*/
	public function getPrintGridlines() {
		return $this->_printGridlines;
	}

	/**
	* Set print gridlines
	*
	* @param boolean $pValue Print gridlines (true/false)
	* @return PHPExcel_Worksheet
	*/
	public function setPrintGridlines($pValue = false) {
		$this->_printGridlines = $pValue;
		return $this;
	}

	/**
	* Show row and column headers?
	*
	* @return boolean
	*/
	public function getShowRowColHeaders() {
		return $this->_showRowColHeaders;
	}

	/**
	* Set show row and column headers
	*
	* @param boolean $pValue Show row and column headers (true/false)
	* @return PHPExcel_Worksheet
	*/
	public function setShowRowColHeaders($pValue = false) {
		$this->_showRowColHeaders = $pValue;
		return $this;
	}

	/**
	 * Show summary below? (Row/Column outlining)
	 *
	 * @return boolean
	 */
	public function getShowSummaryBelow() {
		return $this->_showSummaryBelow;
	}

	/**
	 * Set show summary below
	 *
	 * @param boolean $pValue	Show summary below (true/false)
	 * @return PHPExcel_Worksheet
	 */
	public function setShowSummaryBelow($pValue = true) {
		$this->_showSummaryBelow = $pValue;
		return $this;
	}

	/**
	 * Show summary right? (Row/Column outlining)
	 *
	 * @return boolean
	 */
	public function getShowSummaryRight() {
		return $this->_showSummaryRight;
	}

	/**
	 * Set show summary right
	 *
	 * @param boolean $pValue	Show summary right (true/false)
	 * @return PHPExcel_Worksheet
	 */
	public function setShowSummaryRight($pValue = true) {
		$this->_showSummaryRight = $pValue;
		return $this;
	}

	/**
	 * Get comments
	 *
	 * @return PHPExcel_Comment[]
	 */
	public function getComments()
	{
		return $this->_comments;
	}

	/**
	 * Set comments array for the entire sheet.
	 *
	 * @param array of PHPExcel_Comment
	 * @return PHPExcel_Worksheet
	 */
	public function setComments($pValue = array())
	{
		$this->_comments = $pValue;

		return $this;
	}

	/**
	 * Get comment for cell
	 *
	 * @param	string	$pCellCoordinate	Cell coordinate to get comment for
	 * @return	PHPExcel_Comment
	 * @throws	Exception
	 */
	public function getComment($pCellCoordinate = 'A1')
	{
		// Uppercase coordinate
		$pCellCoordinate = strtoupper($pCellCoordinate);

		if (strpos($pCellCoordinate,':') !== false || strpos($pCellCoordinate,',') !== false) {
			throw new Exception('Cell coordinate string can not be a range of cells.');
		} else if (strpos($pCellCoordinate,'$') !== false) {
			throw new Exception('Cell coordinate string must not be absolute.');
		} else if ($pCellCoordinate == '') {
			throw new Exception('Cell coordinate can not be zero-length string.');
		} else {
			// Check if we already have a comment for this cell.
			// If not, create a new comment.
			if (isset($this->_comments[$pCellCoordinate])) {
				return $this->_comments[$pCellCoordinate];
			} else {
				$newComment = new PHPExcel_Comment();
				$this->_comments[$pCellCoordinate] = $newComment;
				return $newComment;
			}
		}
	}

	/**
	 * Get comment for cell by using numeric cell coordinates
	 *
	 * @param	int $pColumn	Numeric column coordinate of the cell
	 * @param	int $pRow		Numeric row coordinate of the cell
	 * @return	PHPExcel_Comment
	 */
	public function getCommentByColumnAndRow($pColumn = 0, $pRow = 1)
	{
		return $this->getComment(PHPExcel_Cell::stringFromColumnIndex($pColumn) . $pRow);
	}

	/**
	 * Get selected cell
	 *
	 * @deprecated
	 * @return string
	 */
	public function getSelectedCell()
	{
		return $this->getSelectedCells();
	}

	/**
	 * Get active cell
	 *
	 * @return string Example: 'A1'
	 */
	public function getActiveCell()
	{
		return $this->_activeCell;
	}

	/**
	 * Get selected cells
	 *
	 * @return string
	 */
	public function getSelectedCells()
	{
		return $this->_selectedCells;
	}

	/**
	 * Selected cell
	 *
	 * @param	string		$pCell		Cell (i.e. A1)
	 * @return PHPExcel_Worksheet
	 */
	public function setSelectedCell($pCoordinate = 'A1')
	{
		return $this->setSelectedCells($pCoordinate);
	}

	/**
	 * Select a range of cells.
	 *
	 * @param	string		$pCoordinate	Cell range, examples: 'A1', 'B2:G5', 'A:C', '3:6'
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function setSelectedCells($pCoordinate = 'A1')
	{
		// Uppercase coordinate
		$pCoordinate = strtoupper($pCoordinate);

		// Convert 'A' to 'A:A'
		$pCoordinate = preg_replace('/^([A-Z]+)$/', '${1}:${1}', $pCoordinate);

		// Convert '1' to '1:1'
		$pCoordinate = preg_replace('/^([0-9]+)$/', '${1}:${1}', $pCoordinate);

		// Convert 'A:C' to 'A1:C1048576'
		$pCoordinate = preg_replace('/^([A-Z]+):([A-Z]+)$/', '${1}1:${2}1048576', $pCoordinate);

		// Convert '1:3' to 'A1:XFD3'
		$pCoordinate = preg_replace('/^([0-9]+):([0-9]+)$/', 'A${1}:XFD${2}', $pCoordinate);

		if (strpos($pCoordinate,':') !== false || strpos($pCoordinate,',') !== false) {
			list($first, ) = PHPExcel_Cell::splitRange($pCoordinate);
			$this->_activeCell = $first[0];
		} else {
			$this->_activeCell = $pCoordinate;
		}
		$this->_selectedCells = $pCoordinate;
		return $this;
	}

	/**
	 * Selected cell by using numeric cell coordinates
	 *
	 * @param	int	$pColumn	Numeric column coordinate of the cell
	 * @param	int	$pRow		Numeric row coordinate of the cell
	 * @throws	Exception
	 * @return PHPExcel_Worksheet
	 */
	public function setSelectedCellByColumnAndRow($pColumn = 0, $pRow = 1)
	{
		return $this->setSelectedCells(PHPExcel_Cell::stringFromColumnIndex($pColumn) . $pRow);
	}

	/**
	 * Get right-to-left
	 *
	 * @return boolean
	 */
	public function getRightToLeft() {
		return $this->_rightToLeft;
	}

	/**
	 * Set right-to-left
	 *
	 * @param	boolean	$value	Right-to-left true/false
	 * @return PHPExcel_Worksheet
	 */
	public function setRightToLeft($value = false) {
		$this->_rightToLeft = $value;
		return $this;
	}

	/**
	 * Fill worksheet from values in array
	 *
	 * @param	array	$source					Source array
	 * @param	mixed	$nullValue				Value in source array that stands for blank cell
	 * @param	string	$startCell				Insert array starting from this cell address as the top left coordinate
	 * @param	boolean	$strictNullComparison	Apply strict comparison when testing for null values in the array
	 * @throws Exception
	 * @return PHPExcel_Worksheet
	 */
	public function fromArray($source = null, $nullValue = null, $startCell = 'A1', $strictNullComparison = false) {
		if (is_array($source)) {
			//	Convert a 1-D array to 2-D (for ease of looping)
			if (!is_array(end($source))) {
				$source = array($source);
			}

			// start coordinate
			list ($startColumn, $startRow) = PHPExcel_Cell::coordinateFromString($startCell);

			// Loop through $source
			foreach ($source as $rowData) {
				$currentColumn = $startColumn;
				foreach($rowData as $cellValue) {
					if ($strictNullComparison) {
						if ($cellValue !== $nullValue) {
							// Set cell value
							$this->getCell($currentColumn . $startRow)->setValue($cellValue);
						}
					} else {
						if ($cellValue != $nullValue) {
							// Set cell value
							$this->getCell($currentColumn . $startRow)->setValue($cellValue);
						}
					}
					++$currentColumn;
				}
				++$startRow;
			}
		} else {
			throw new Exception("Parameter \$source should be an array.");
		}
		return $this;
	}

	/**
	 * Create array from a range of cells
	 *
	 * @param	string	$pRange					Range of cells (i.e. "A1:B10"), or just one cell (i.e. "A1")
	 * @param	mixed	$nullValue				Value returned in the array entry if a cell doesn't exist
	 * @param	boolean	$calculateFormulas		Should formulas be calculated?
	 * @param	boolean	$formatData				Should formatting be applied to cell values?
	 * @param	boolean	$returnCellRef			False - Return a simple array of rows and columns indexed by number counting from zero
	 *											True - Return rows and columns indexed by their actual row and column IDs
	 * @return array
	 */
	public function rangeToArray($pRange = 'A1', $nullValue = null, $calculateFormulas = true, $formatData = true, $returnCellRef = false) {
		// Returnvalue
		$returnValue = array();

		//	Identify the range that we need to extract from the worksheet
		list($rangeStart, $rangeEnd) = PHPExcel_Cell::rangeBoundaries($pRange);
		$minCol = PHPExcel_Cell::stringFromColumnIndex($rangeStart[0] -1);
		$minRow = $rangeStart[1];
		$maxCol = PHPExcel_Cell::stringFromColumnIndex($rangeEnd[0] -1);
		$maxRow = $rangeEnd[1];

		$maxCol++;

		// Loop through rows
		for ($row = $minRow; $row <= $maxRow; ++$row) {
			$c = -1;
			// Loop through columns in the current row
			for ($col = $minCol; $col != $maxCol; ++$col) {
				$rRef = ($returnCellRef) ? $row : $row-1;
				$cRef = ($returnCellRef) ? $col : ++$c;
				//	Using getCell() will create a new cell if it doesn't already exist. We don't want that to happen
				//		so we test and retrieve directly against _cellCollection
				if ($this->_cellCollection->isDataSet($col.$row)) {
					// Cell exists
					$cell = $this->_cellCollection->getCacheData($col.$row);
					if ($cell->getValue() !== null) {
						if ($cell->getValue() instanceof PHPExcel_RichText) {
							$returnValue[$rRef][$cRef] = $cell->getValue()->getPlainText();
						} else {
							if ($calculateFormulas) {
								$returnValue[$rRef][$cRef] = $cell->getCalculatedValue();
							} else {
								$returnValue[$rRef][$cRef] = $cell->getValue();
							}
						}

						if ($formatData) {
							$style = $this->_parent->getCellXfByIndex($cell->getXfIndex());
							$returnValue[$rRef][$cRef] = PHPExcel_Style_NumberFormat::toFormattedString($returnValue[$rRef][$cRef], $style->getNumberFormat()->getFormatCode());
						}
					} else {
						// Cell holds a NULL
						$returnValue[$rRef][$cRef] = $nullValue;
					}
				} else {
					// Cell doesn't exist
					$returnValue[$rRef][$cRef] = $nullValue;
				}
			}
		}

		// Return
		return $returnValue;
	}


	/**
	 * Create array from a range of cells
	 *
	 * @param	string	$pNamedRange			Name of the Named Range
	 * @param	mixed	$nullValue				Value returned in the array entry if a cell doesn't exist
	 * @param	boolean	$calculateFormulas		Should formulas be calculated?
	 * @param	boolean	$formatData				Should formatting be applied to cell values?
	 * @param	boolean	$returnCellRef			False - Return a simple array of rows and columns indexed by number counting from zero
	 *											True - Return rows and columns indexed by their actual row and column IDs
	 * @return array
	 * @throws Exception
	 */
	public function namedRangeToArray($pNamedRange = '', $nullValue = null, $calculateFormulas = true, $formatData = true, $returnCellRef = false) {
		$namedRange = PHPExcel_NamedRange::resolveRange($pNamedRange, $this);
		if (!is_null($namedRange)) {
			$pWorkSheet = $namedRange->getWorksheet();
			$pCellRange = $namedRange->getRange();

			return $pWorkSheet->rangeToArray(	$pCellRange,
												$nullValue, $calculateFormulas, $formatData, $returnCellRef);
		}

		throw new Exception('Named Range '.$pNamedRange.' does not exist.');
	}


	/**
	 * Create array from worksheet
	 *
	 * @param	mixed	$nullValue				Value returned in the array entry if a cell doesn't exist
	 * @param	boolean	$calculateFormulas		Should formulas be calculated?
	 * @param	boolean	$formatData				Should formatting be applied to cell values?
	 * @param	boolean	$returnCellRef			False - Return a simple array of rows and columns indexed by number counting from zero
	 *											True - Return rows and columns indexed by their actual row and column IDs
	 * @return array
	 */
	public function toArray($nullValue = null, $calculateFormulas = true, $formatData = true, $returnCellRef = false) {
		// Garbage collect...
		$this->garbageCollect();

		//	Identify the range that we need to extract from the worksheet
		$maxCol = $this->getHighestColumn();
		$maxRow = $this->getHighestRow();

		// Return
		return $this->rangeToArray(	'A1:'.$maxCol.$maxRow,
									$nullValue, $calculateFormulas, $formatData, $returnCellRef);
	}

	/**
	 * Get row iterator
	 *
	 * @return PHPExcel_Worksheet_RowIterator
	 */
	public function getRowIterator() {
		return new PHPExcel_Worksheet_RowIterator($this);
	}

	/**
	 * Run PHPExcel garabage collector.
	 *
	 * @return PHPExcel_Worksheet
	 */
	public function garbageCollect() {
		// Build a reference table from images
//		$imageCoordinates = array();
//		$iterator = $this->getDrawingCollection()->getIterator();
//		while ($iterator->valid()) {
//			$imageCoordinates[$iterator->current()->getCoordinates()] = true;
//
//			$iterator->next();
//		}
//
		// Lookup highest column and highest row if cells are cleaned
		$highestColumn = -1;
		$highestRow	= 1;

		// Find cells that can be cleaned
		$col = $row = array();
		foreach ($this->_cellCollection->getCellList() as $coord) {
			list($c,$r) = sscanf($coord,'%[A-Z]%d');
			$row[$r] = $r;
			$col[$c] = strlen($c).$c;
		}
		if (count($row) > 0) {
			// Determine highest column and row
			$highestRow = max($row);
			$highestColumn = PHPExcel_Cell::columnIndexFromString(substr(max($col),1));
		}

		// Loop through column dimensions
		foreach ($this->_columnDimensions as $dimension) {
			$highestColumn = max($highestColumn,PHPExcel_Cell::columnIndexFromString($dimension->getColumnIndex()));
		}

		// Loop through row dimensions
		foreach ($this->_rowDimensions as $dimension) {
			$highestRow = max($highestRow,$dimension->getRowIndex());
		}

		// Cache values
		if ($highestColumn < 0) {
			$this->_cachedHighestColumn = 'A';
		} else {
			$this->_cachedHighestColumn = PHPExcel_Cell::stringFromColumnIndex(--$highestColumn);
		}
		$this->_cachedHighestRow = $highestRow;

		// Return
		return $this;
	}

	/**
	 * Get hash code
	 *
	 * @return string	Hash code
	 */
	public function getHashCode() {
		if ($this->_dirty) {
			$this->_hash = md5( $this->_title .
								$this->_autoFilter .
								($this->_protection->isProtectionEnabled() ? 't' : 'f') .
								__CLASS__
							  );
			$this->_dirty = false;
		}
		return $this->_hash;
	}

	/**
	 * Extract worksheet title from range.
	 *
	 * Example: extractSheetTitle("testSheet!A1") ==> 'A1'
	 * Example: extractSheetTitle("'testSheet 1'!A1", true) ==> array('testSheet 1', 'A1');
	 *
	 * @param string $pRange	Range to extract title from
	 * @param bool $returnRange	Return range? (see example)
	 * @return mixed
	 */
	public static function extractSheetTitle($pRange, $returnRange = false) {
		// Sheet title included?
		if (($sep = strpos($pRange, '!')) === false) {
			return '';
		}

		if ($returnRange) {
			return array( trim(substr($pRange, 0, $sep),"'"),
						  substr($pRange, $sep + 1)
						);
		}

		return substr($pRange, $sep + 1);
	}

	/**
	 * Get hyperlink
	 *
	 * @param string $pCellCoordinate	Cell coordinate to get hyperlink for
	 */
	public function getHyperlink($pCellCoordinate = 'A1')
	{
		// return hyperlink if we already have one
		if (isset($this->_hyperlinkCollection[$pCellCoordinate])) {
			return $this->_hyperlinkCollection[$pCellCoordinate];
		}

		// else create hyperlink
		$this->_hyperlinkCollection[$pCellCoordinate] = new PHPExcel_Cell_Hyperlink();
		return $this->_hyperlinkCollection[$pCellCoordinate];
	}

	/**
	 * Set hyperlnk
	 *
	 * @param string $pCellCoordinate	Cell coordinate to insert hyperlink
	 * @param	PHPExcel_Cell_Hyperlink	$pHyperlink
	 * @return PHPExcel_Worksheet
	 */
	public function setHyperlink($pCellCoordinate = 'A1', PHPExcel_Cell_Hyperlink $pHyperlink = null)
	{
		if ($pHyperlink === null) {
			unset($this->_hyperlinkCollection[$pCellCoordinate]);
		} else {
			$this->_hyperlinkCollection[$pCellCoordinate] = $pHyperlink;
		}
		return $this;
	}

	/**
	 * Hyperlink at a specific coordinate exists?
	 *
	 * @param string $pCellCoordinate
	 * @return boolean
	 */
	public function hyperlinkExists($pCoordinate = 'A1')
	{
		return isset($this->_hyperlinkCollection[$pCoordinate]);
	}

	/**
	 * Get collection of hyperlinks
	 *
	 * @return PHPExcel_Cell_Hyperlink[]
	 */
	public function getHyperlinkCollection()
	{
		return $this->_hyperlinkCollection;
	}

	/**
	 * Get data validation
	 *
	 * @param string $pCellCoordinate	Cell coordinate to get data validation for
	 */
	public function getDataValidation($pCellCoordinate = 'A1')
	{
		// return data validation if we already have one
		if (isset($this->_dataValidationCollection[$pCellCoordinate])) {
			return $this->_dataValidationCollection[$pCellCoordinate];
		}

		// else create data validation
		$this->_dataValidationCollection[$pCellCoordinate] = new PHPExcel_Cell_DataValidation();
		return $this->_dataValidationCollection[$pCellCoordinate];
	}

	/**
	 * Set data validation
	 *
	 * @param string $pCellCoordinate	Cell coordinate to insert data validation
	 * @param	PHPExcel_Cell_DataValidation	$pDataValidation
	 * @return PHPExcel_Worksheet
	 */
	public function setDataValidation($pCellCoordinate = 'A1', PHPExcel_Cell_DataValidation $pDataValidation = null)
	{
		if ($pDataValidation === null) {
			unset($this->_dataValidationCollection[$pCellCoordinate]);
		} else {
			$this->_dataValidationCollection[$pCellCoordinate] = $pDataValidation;
		}
		return $this;
	}

	/**
	 * Data validation at a specific coordinate exists?
	 *
	 * @param string $pCellCoordinate
	 * @return boolean
	 */
	public function dataValidationExists($pCoordinate = 'A1')
	{
		return isset($this->_dataValidationCollection[$pCoordinate]);
	}

	/**
	 * Get collection of data validations
	 *
	 * @return PHPExcel_Cell_DataValidation[]
	 */
	public function getDataValidationCollection()
	{
		return $this->_dataValidationCollection;
	}

	/**
	 * Accepts a range, returning it as a range that falls within the current highest row and column of the worksheet
	 *
	 * @param	string	$range
	 * @return	string	Adjusted range value
	 */
	public function shrinkRangeToFit($range) {
		$maxCol = $this->getHighestColumn();
		$maxRow = $this->getHighestRow();
		$maxCol = PHPExcel_Cell::columnIndexFromString($maxCol);

		$rangeBlocks = explode(' ',$range);
		foreach ($rangeBlocks as &$rangeSet) {
			$rangeBoundaries = PHPExcel_Cell::getRangeBoundaries($rangeSet);

			if (PHPExcel_Cell::columnIndexFromString($rangeBoundaries[0][0]) > $maxCol) { $rangeBoundaries[0][0] = PHPExcel_Cell::stringFromColumnIndex($maxCol); }
			if ($rangeBoundaries[0][1] > $maxRow) { $rangeBoundaries[0][1] = $maxRow; }
			if (PHPExcel_Cell::columnIndexFromString($rangeBoundaries[1][0]) > $maxCol) { $rangeBoundaries[1][0] = PHPExcel_Cell::stringFromColumnIndex($maxCol); }
			if ($rangeBoundaries[1][1] > $maxRow) { $rangeBoundaries[1][1] = $maxRow; }
			$rangeSet = $rangeBoundaries[0][0].$rangeBoundaries[0][1].':'.$rangeBoundaries[1][0].$rangeBoundaries[1][1];
		}
		unset($rangeSet);
		$stRange = implode(' ',$rangeBlocks);

		return $stRange;
	}


	/**
	 * Get tab color
	 *
	 * @return PHPExcel_Style_Color
	 */
	public function getTabColor()
	{
		if (is_null($this->_tabColor))
			$this->_tabColor = new PHPExcel_Style_Color();

		return $this->_tabColor;
	}

	/**
	 * Reset tab color
	 *
	 * @return PHPExcel_Worksheet
	 */
	public function resetTabColor()
	{
		$this->_tabColor = null;
		unset($this->_tabColor);

		return $this;
	}

	/**
	 * Tab color set?
	 *
	 * @return boolean
	 */
	public function isTabColorSet()
	{
		return !is_null($this->_tabColor);
	}

	/**
	 * Copy worksheet (!= clone!)
	 *
	 * @return PHPExcel_Worksheet
	 */
	public function copy() {
		$copied = clone $this;

		return $copied;
	}

	/**
	 * Implement PHP __clone to create a deep clone, not just a shallow copy.
	 */
	public function __clone() {
		foreach ($this as $key => $val) {
			if ($key == '_parent') {
				continue;
			}

			if (is_object($val) || (is_array($val))) {
				if ($key == '_cellCollection') {
					$newCollection = clone $this->_cellCollection;
					$newCollection->copyCellCollection($this);
					$this->_cellCollection = $newCollection;
				} elseif ($key == '_drawingCollection') {
					$newCollection = clone $this->_drawingCollection;
					$this->_drawingCollection = $newCollection;
				} else {
					$this->{$key} = unserialize(serialize($val));
				}
			}
		}
	}
}