<?php

/**
 * PHPExcel_Worksheet
 *
 * Copyright (c) 2006 - 2015 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 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */
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;
  
  /**
   * Collection of row dimensions
   *
   * @var PHPExcel_Worksheet_RowDimension[]
   */
  private $rowDimensions = array ();
  
  /**
   * Default row dimension
   *
   * @var PHPExcel_Worksheet_RowDimension
   */
  private $defaultRowDimension;
  
  /**
   * 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;
  
  /**
   * Collection of Chart objects
   *
   * @var PHPExcel_Chart[]
   */
  private $chartCollection = array ();
  
  /**
   * 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 and selection
   *
   * @var PHPExcel_Worksheet_AutoFilter
   */
  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;
  
  /**
   * CodeName
   *
   * @var string
   */
  private $codeName = 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, false );
    // setTitle can change $pTitle
    $this->setCodeName ( $this->getTitle () );
    $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 ();
    // Chart collection
    $this->chartCollection = 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 );
    $this->autoFilter = new PHPExcel_Worksheet_AutoFilter ( null, $this );
  }
  
  /**
   * Disconnect all cells from this PHPExcel_Worksheet object,
   * typically so that the worksheet object can be unset
   */
  public function disconnectCells()
  {
    if ($this->cellCollection !== null)
    {
      $this->cellCollection->unsetWorksheetCells ();
      $this->cellCollection = null;
    }
    // detach ourself from the workbook, so that it can then delete this worksheet successfully
    $this->parent = null;
  }
  
  /**
   * Code to execute when this worksheet is unset()
   */
  public function __destruct()
  {
    PHPExcel_Calculation::getInstance ( $this->parent )->clearCalculationCacheForWorksheet ( $this->title );
    
    $this->disconnectCells ();
  }
  
  /**
   * 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 code name for valid Excel syntax
   *
   * @param string $pValue
   *          The string to check
   * @return string The valid string
   * @throws Exception
   */
  private static function checkSheetCodeName($pValue)
  {
    $CharCount = PHPExcel_Shared_String::CountCharacters ( $pValue );
    if ($CharCount == 0)
    {
      throw new PHPExcel_Exception ( 'Sheet code name cannot be empty.' );
    }
    // Some of the printable ASCII characters are invalid: * : / \ ? [ ] and first and last characters cannot be a "'"
    if ((str_replace ( self::$invalidCharacters, '', $pValue ) !== $pValue) || (PHPExcel_Shared_String::Substring ( $pValue, - 1, 1 ) == '\'') || (PHPExcel_Shared_String::Substring ( $pValue, 0, 1 ) == '\''))
    {
      throw new PHPExcel_Exception ( 'Invalid character found in sheet code name' );
    }
    
    // Maximum 31 characters allowed for sheet title
    if ($CharCount > 31)
    {
      throw new PHPExcel_Exception ( 'Maximum 31 characters allowed in sheet code name.' );
    }
    
    return $pValue;
  }
  
  /**
   * Check sheet title for valid Excel syntax
   *
   * @param string $pValue
   *          The string to check
   * @return string The valid string
   * @throws PHPExcel_Exception
   */
  private static function checkSheetTitle($pValue)
  {
    // Some of the printable ASCII characters are invalid: * : / \ ? [ ]
    if (str_replace ( self::$invalidCharacters, '', $pValue ) !== $pValue)
    {
      throw new PHPExcel_Exception ( 'Invalid character found in sheet title' );
    }
    
    // Maximum 31 characters allowed for sheet title
    if (PHPExcel_Shared_String::CountCharacters ( $pValue ) > 31)
    {
      throw new PHPExcel_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 $this->sortCellCollection ();
    }
    if ($this->cellCollection !== null)
    {
      return $this->cellCollection->getCellList ();
    }
    return array ();
  }
  
  /**
   * Sort collection of cells
   *
   * @return PHPExcel_Worksheet
   */
  public function sortCellCollection()
  {
    if ($this->cellCollection !== null)
    {
      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;
  }
  
  /**
   * Get collection of charts
   *
   * @return PHPExcel_Chart[]
   */
  public function getChartCollection()
  {
    return $this->chartCollection;
  }
  
  /**
   * Add chart
   *
   * @param PHPExcel_Chart $pChart          
   * @param int|null $iChartIndex
   *          Index where chart should go (0,1,..., or null for last)
   * @return PHPExcel_Chart
   */
  public function addChart(PHPExcel_Chart $pChart = null, $iChartIndex = null)
  {
    $pChart->setWorksheet ( $this );
    if (is_null ( $iChartIndex ))
    {
      $this->chartCollection [] = $pChart;
    }
    else
    {
      // Insert the chart at the requested index
      array_splice ( $this->chartCollection, $iChartIndex, 0, array (
          $pChart 
      ) );
    }
    
    return $pChart;
  }
  
  /**
   * Return the count of charts on this worksheet
   *
   * @return int The number of charts
   */
  public function getChartCount()
  {
    return count ( $this->chartCollection );
  }
  
  /**
   * Get a chart by its index position
   *
   * @param string $index
   *          Chart index position
   * @return false|PHPExcel_Chart
   * @throws PHPExcel_Exception
   */
  public function getChartByIndex($index = null)
  {
    $chartCount = count ( $this->chartCollection );
    if ($chartCount == 0)
    {
      return false;
    }
    if (is_null ( $index ))
    {
      $index = -- $chartCount;
    }
    if (! isset ( $this->chartCollection [$index] ))
    {
      return false;
    }
    
    return $this->chartCollection [$index];
  }
  
  /**
   * Return an array of the names of charts on this worksheet
   *
   * @return string[] The names of charts
   * @throws PHPExcel_Exception
   */
  public function getChartNames()
  {
    $chartNames = array ();
    foreach ( $this->chartCollection as $chart )
    {
      $chartNames [] = $chart->getName ();
    }
    return $chartNames;
  }
  
  /**
   * Get a chart by name
   *
   * @param string $chartName
   *          Chart name
   * @return false|PHPExcel_Chart
   * @throws PHPExcel_Exception
   */
  public function getChartByName($chartName = '')
  {
    $chartCount = count ( $this->chartCollection );
    if ($chartCount == 0)
    {
      return false;
    }
    foreach ( $this->chartCollection as $index => $chart )
    {
      if ($chart->getName () == $chartName)
      {
        return $this->chartCollection [$index];
      }
    }
    return false;
  }
  
  /**
   * 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 worksheet data dimension
   *
   * @return string String containing the dimension of this worksheet that actually contain data
   */
  public function calculateWorksheetDataDimension()
  {
    // Return
    return 'A1' . ':' . $this->getHighestDataColumn () . $this->getHighestDataRow ();
  }
  
  /**
   * 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 ( $autoSizes [$this->cellCollection->getCurrentColumn ()] ))
        {
          // Determine width if cell does not participate in a merge
          if (! isset ( $isMergeCell [$this->cellCollection->getCurrentAddress ()] ))
          {
            // Calculated value
            // To formatted string
            $cellValue = PHPExcel_Style_NumberFormat::toFormattedString ( $cell->getCalculatedValue (), $this->getParent ()
              ->getCellXfByIndex ( $cell->getXfIndex () )
              ->getNumberFormat ()
              ->getFormatCode () );
            
            $autoSizes [$this->cellCollection->getCurrentColumn ()] = max ( ( float ) $autoSizes [$this->cellCollection->getCurrentColumn ()], ( 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 $parent)
  {
    if ($this->parent !== null)
    {
      $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
   * @param string $updateFormulaCellReferences
   *          boolean Flag indicating whether cell references in formulae should
   *          be updated to reflect the new sheet name.
   *          This should be left as the default true, unless you are
   *          certain that no formula cells on any worksheet contain
   *          references to this worksheet
   * @return PHPExcel_Worksheet
   */
  public function setTitle($pValue = 'Worksheet', $updateFormulaCellReferences = true)
  {
    // Is this a 'rename' or not?
    if ($this->getTitle () == $pValue)
    {
      return $this;
    }
    
    // Syntax check
    self::checkSheetTitle ( $pValue );
    
    // Old title
    $oldTitle = $this->getTitle ();
    
    if ($this->parent)
    {
      // Is there already such sheet name?
      if ($this->parent->sheetNameExists ( $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->parent->sheetNameExists ( $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, $updateFormulaCellReferences );
      }
    }
    
    // Set title
    $this->title = $pValue;
    $this->dirty = true;
    
    if ($this->parent)
    {
      // New title
      $newTitle = $this->getTitle ();
      PHPExcel_Calculation::getInstance ( $this->parent )->renameCalculationCacheForWorksheet ( $oldTitle, $newTitle );
      if ($updateFormulaCellReferences)
      {
        PHPExcel_ReferenceHelper::getInstance ()->updateNamedFormulas ( $this->parent, $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_SheetView
   */
  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
   *
   * @param string $row
   *          Return the data highest column for the specified row,
   *          or the highest column of any row if no row number is passed
   * @return string Highest column name
   */
  public function getHighestColumn($row = null)
  {
    if ($row == null)
    {
      return $this->cachedHighestColumn;
    }
    return $this->getHighestDataColumn ( $row );
  }
  
  /**
   * Get highest worksheet column that contains data
   *
   * @param string $row
   *          Return the highest data column for the specified row,
   *          or the highest data column of any row if no row number is passed
   * @return string Highest column name that contains data
   */
  public function getHighestDataColumn($row = null)
  {
    return $this->cellCollection->getHighestColumn ( $row );
  }
  
  /**
   * Get highest worksheet row
   *
   * @param string $column
   *          Return the highest data row for the specified column,
   *          or the highest row of any column if no column letter is passed
   * @return int Highest row number
   */
  public function getHighestRow($column = null)
  {
    if ($column == null)
    {
      return $this->cachedHighestRow;
    }
    return $this->getHighestDataRow ( $column );
  }
  
  /**
   * Get highest worksheet row that contains data
   *
   * @param string $column
   *          Return the highest data row for the specified column,
   *          or the highest data row of any column if no column letter is passed
   * @return string Highest row number that contains data
   */
  public function getHighestDataRow($column = null)
  {
    return $this->cellCollection->getHighestRow ( $column );
  }
  
  /**
   * Get highest worksheet column and highest row that have cell records
   *
   * @return array Highest column name and highest row number
   */
  public function getHighestRowAndColumn()
  {
    return $this->cellCollection->getHighestRowAndColumn ();
  }
  
  /**
   * 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 ( strtoupper ( $pCoordinate ) )
      ->setValue ( $pValue );
    return ($returnCell) ? $cell : $this;
  }
  
  /**
   * Set a cell value by using numeric cell coordinates
   *
   * @param string $pColumn
   *          Numeric column coordinate of the cell (A = 0)
   * @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->getCellByColumnAndRow ( $pColumn, $pRow )
      ->setValue ( $pValue );
    return ($returnCell) ? $cell : $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
   * @param bool $returnCell
   *          Return the worksheet (false, default) or the cell (true)
   * @return PHPExcel_Worksheet|PHPExcel_Cell Depending on the last parameter being specified
   */
  public function setCellValueExplicit($pCoordinate = 'A1', $pValue = null, $pDataType = PHPExcel_Cell_DataType::TYPE_STRING, $returnCell = false)
  {
    // Set value
    $cell = $this->getCell ( strtoupper ( $pCoordinate ) )
      ->setValueExplicit ( $pValue, $pDataType );
    return ($returnCell) ? $cell : $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
   * @param bool $returnCell
   *          Return the worksheet (false, default) or the cell (true)
   * @return PHPExcel_Worksheet|PHPExcel_Cell Depending on the last parameter being specified
   */
  public function setCellValueExplicitByColumnAndRow($pColumn = 0, $pRow = 1, $pValue = null, $pDataType = PHPExcel_Cell_DataType::TYPE_STRING, $returnCell = false)
  {
    $cell = $this->getCellByColumnAndRow ( $pColumn, $pRow )
      ->setValueExplicit ( $pValue, $pDataType );
    return ($returnCell) ? $cell : $this;
  }
  
  /**
   * Get cell at a specific coordinate
   *
   * @param string $pCoordinate
   *          Coordinate of the cell
   * @throws PHPExcel_Exception
   * @return PHPExcel_Cell Cell that was found
   */
  public function getCell($pCoordinate = 'A1')
  {
    // Check cell collection
    if ($this->cellCollection->isDataSet ( strtoupper ( $pCoordinate ) ))
    {
      return $this->cellCollection->getCacheData ( $pCoordinate );
    }
    
    // Worksheet reference?
    if (strpos ( $pCoordinate, '!' ) !== false)
    {
      $worksheetReference = PHPExcel_Worksheet::extractSheetTitle ( $pCoordinate, true );
      return $this->parent->getSheetByName ( $worksheetReference [0] )
        ->getCell ( strtoupper ( $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, $this );
      if ($namedRange !== null)
      {
        $pCoordinate = $namedRange->getRange ();
        return $namedRange->getWorksheet ()
          ->getCell ( $pCoordinate );
      }
    }
    
    // Uppercase coordinate
    $pCoordinate = strtoupper ( $pCoordinate );
    
    if (strpos ( $pCoordinate, ':' ) !== false || strpos ( $pCoordinate, ',' ) !== false)
    {
      throw new PHPExcel_Exception ( 'Cell coordinate can not be a range of cells.' );
    }
    elseif (strpos ( $pCoordinate, '$' ) !== false)
    {
      throw new PHPExcel_Exception ( 'Cell coordinate must not be absolute.' );
    }
    
    // Create new cell object
    return $this->createNewCell ( $pCoordinate );
  }
  
  /**
   * 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 ))
    {
      return $this->cellCollection->getCacheData ( $coordinate );
    }
    
    return $this->createNewCell ( $coordinate );
  }
  
  /**
   * Create a new cell at the specified coordinate
   *
   * @param string $pCoordinate
   *          Coordinate of the cell
   * @return PHPExcel_Cell Cell that was created
   */
  private function createNewCell($pCoordinate)
  {
    $cell = $this->cellCollection->addCacheData ( $pCoordinate, new PHPExcel_Cell ( null, PHPExcel_Cell_DataType::TYPE_NULL, $this ) );
    $this->cellCollectionIsSorted = false;
    
    // Coordinates
    $aCoordinates = PHPExcel_Cell::coordinateFromString ( $pCoordinate );
    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 from dimensions records
    // but don't create dimension records if they don't already exist
    $rowDimension = $this->getRowDimension ( $aCoordinates [1], false );
    $columnDimension = $this->getColumnDimension ( $aCoordinates [0], false );
    
    if ($rowDimension !== null && $rowDimension->getXfIndex () > 0)
    {
      // then there is a row dimension with explicit style, assign it to the cell
      $cell->setXfIndex ( $rowDimension->getXfIndex () );
    }
    elseif ($columnDimension !== null && $columnDimension->getXfIndex () > 0)
    {
      // then there is a column dimension, assign it to the cell
      $cell->setXfIndex ( $columnDimension->getXfIndex () );
    }
    
    return $cell;
  }
  
  /**
   * Does the cell at a specific coordinate exist?
   *
   * @param string $pCoordinate
   *          Coordinate of the cell
   * @throws PHPExcel_Exception
   * @return boolean
   */
  public function cellExists($pCoordinate = 'A1')
  {
    // Worksheet reference?
    if (strpos ( $pCoordinate, '!' ) !== false)
    {
      $worksheetReference = PHPExcel_Worksheet::extractSheetTitle ( $pCoordinate, true );
      return $this->parent->getSheetByName ( $worksheetReference [0] )
        ->cellExists ( strtoupper ( $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, $this );
      if ($namedRange !== null)
      {
        $pCoordinate = $namedRange->getRange ();
        if ($this->getHashCode () != $namedRange->getWorksheet ()
          ->getHashCode ())
        {
          if (! $namedRange->getLocalOnly ())
          {
            return $namedRange->getWorksheet ()
              ->cellExists ( $pCoordinate );
          }
          else
          {
            throw new PHPExcel_Exception ( 'Named range ' . $namedRange->getName () . ' is not accessible from within sheet ' . $this->getTitle () );
          }
        }
      }
      else
      {
        return false;
      }
    }
    
    // Uppercase coordinate
    $pCoordinate = strtoupper ( $pCoordinate );
    
    if (strpos ( $pCoordinate, ':' ) !== false || strpos ( $pCoordinate, ',' ) !== false)
    {
      throw new PHPExcel_Exception ( 'Cell coordinate can not be a range of cells.' );
    }
    elseif (strpos ( $pCoordinate, '$' ) !== false)
    {
      throw new PHPExcel_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, $create = true)
  {
    // Found
    $found = null;
    
    // Get row dimension
    if (! isset ( $this->rowDimensions [$pRow] ))
    {
      if (! $create)
      {
        return null;
      }
      $this->rowDimensions [$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', $create = true)
  {
    // Uppercase coordinate
    $pColumn = strtoupper ( $pColumn );
    
    // Fetch dimensions
    if (! isset ( $this->columnDimensions [$pColumn] ))
    {
      if (! $create)
      {
        return null;
      }
      $this->columnDimensions [$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 $pColumn
   *          Numeric column coordinate of the cell
   * @return PHPExcel_Worksheet_ColumnDimension
   */
  public function getColumnDimensionByColumn($pColumn = 0)
  {
    return $this->getColumnDimension ( PHPExcel_Cell::stringFromColumnIndex ( $pColumn ) );
  }
  
  /**
   * Get styles
   *
   * @return PHPExcel_Style[]
   */
  public function getStyles()
  {
    return $this->styles;
  }
  
  /**
   * Get default style of workbook.
   *
   * @deprecated
   *
   * @return PHPExcel_Style
   * @throws PHPExcel_Exception
   */
  public function getDefaultStyle()
  {
    return $this->parent->getDefaultStyle ();
  }
  
  /**
   * Set default style - should only be used by PHPExcel_IReader implementations!
   *
   * @deprecated
   *
   * @param PHPExcel_Style $pValue          
   * @throws PHPExcel_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 $pCellCoordinate
   *          Cell coordinate (or range) to get style for
   * @return PHPExcel_Style
   * @throws PHPExcel_Exception
   */
  public function getStyle($pCellCoordinate = 'A1')
  {
    // set this sheet as active
    $this->parent->setActiveSheetIndex ( $this->parent->getIndex ( $this ) );
    
    // set cell coordinate as active
    $this->setSelectedCells ( strtoupper ( $pCellCoordinate ) );
    
    return $this->parent->getCellXfSupervisor ();
  }
  
  /**
   * Get conditional styles for a cell
   *
   * @param string $pCoordinate          
   * @return PHPExcel_Style_Conditional[]
   */
  public function getConditionalStyles($pCoordinate = 'A1')
  {
    $pCoordinate = strtoupper ( $pCoordinate );
    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 [strtoupper ( $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 [strtoupper ( $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 [strtoupper ( $pCoordinate )] = $pValue;
    return $this;
  }
  
  /**
   * Get style for cell by using numeric cell coordinates
   *
   * @param int $pColumn
   *          Numeric column coordinate of the cell
   * @param int $pRow
   *          Numeric row coordinate of the cell
   * @param
   *          int pColumn2 Numeric column coordinate of the range cell
   * @param
   *          int pRow2 Numeric row coordinate of the range cell
   * @return PHPExcel_Style
   */
  public function getStyleByColumnAndRow($pColumn = 0, $pRow = 1, $pColumn2 = null, $pRow2 = null)
  {
    if (! is_null ( $pColumn2 ) && ! is_null ( $pRow2 ))
    {
      $cellRange = PHPExcel_Cell::stringFromColumnIndex ( $pColumn ) . $pRow . ':' . PHPExcel_Cell::stringFromColumnIndex ( $pColumn2 ) . $pRow2;
      return $this->getStyle ( $cellRange );
    }
    
    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 PHPExcel_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 PHPExcel_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 ();
    }
    
    // Calculate range outer borders
    list ( $rangeStart, $rangeEnd ) = PHPExcel_Cell::rangeBoundaries ( $pRange . ':' . $pRange );
    
    // 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 - 1 ) . $row )
          ->setXfIndex ( $xfIndex );
      }
    }
    
    return $this;
  }
  
  /**
   * Duplicate conditional style to a range of cells
   *
   * Please note that this will overwrite existing cell styles for cells in range!
   *
   * @param
   *          array of PHPExcel_Style_Conditional $pCellStyle Cell style to duplicate
   * @param string $pRange
   *          Range of cells (i.e. "A1:B10"), or just one cell (i.e. "A1")
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function duplicateConditionalStyle(array $pCellStyle = null, $pRange = '')
  {
    foreach ( $pCellStyle as $cellStyle )
    {
      if (! ($cellStyle instanceof PHPExcel_Style_Conditional))
      {
        throw new PHPExcel_Exception ( 'Style is not a conditional style' );
      }
    }
    
    // Calculate range outer borders
    list ( $rangeStart, $rangeEnd ) = PHPExcel_Cell::rangeBoundaries ( $pRange . ':' . $pRange );
    
    // 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->setConditionalStyles ( PHPExcel_Cell::stringFromColumnIndex ( $col - 1 ) . $row, $pCellStyle );
      }
    }
    
    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 $pAdvanced
   *          Advanced mode for setting borders.
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function duplicateStyleArray($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 $pBreak
   *          Break type (type of PHPExcel_Worksheet::BREAK_*)
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function setBreak($pCell = 'A1', $pBreak = PHPExcel_Worksheet::BREAK_NONE)
  {
    // Uppercase coordinate
    $pCell = strtoupper ( $pCell );
    
    if ($pCell != '')
    {
      if ($pBreak == PHPExcel_Worksheet::BREAK_NONE)
      {
        if (isset ( $this->breaks [$pCell] ))
        {
          unset ( $this->breaks [$pCell] );
        }
      }
      else
      {
        $this->breaks [$pCell] = $pBreak;
      }
    }
    else
    {
      throw new PHPExcel_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 $pBreak
   *          Break type (type of PHPExcel_Worksheet::BREAK_*)
   * @return PHPExcel_Worksheet
   */
  public function setBreakByColumnAndRow($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 $pRange
   *          Cell range (e.g. A1:E1)
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function mergeCells($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 PHPExcel_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 $pRow2
   *          Numeric row coordinate of the last cell
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function mergeCellsByColumnAndRow($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 $pRange
   *          Cell range (e.g. A1:E1)
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function unmergeCells($pRange = 'A1:A1')
  {
    // Uppercase coordinate
    $pRange = strtoupper ( $pRange );
    
    if (strpos ( $pRange, ':' ) !== false)
    {
      if (isset ( $this->mergeCells [$pRange] ))
      {
        unset ( $this->mergeCells [$pRange] );
      }
      else
      {
        throw new PHPExcel_Exception ( 'Cell range ' . $pRange . ' not known as merged.' );
      }
    }
    else
    {
      throw new PHPExcel_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 $pRow2
   *          Numeric row coordinate of the last cell
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function unmergeCellsByColumnAndRow($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 $pAlreadyHashed
   *          If the password has already been hashed, set this to true
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function protectCells($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 $pAlreadyHashed
   *          If the password has already been hashed, set this to true
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function protectCellsByColumnAndRow($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 $pRange
   *          Cell (e.g. A1) or cell range (e.g. A1:E1)
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function unprotectCells($pRange = 'A1')
  {
    // Uppercase coordinate
    $pRange = strtoupper ( $pRange );
    
    if (isset ( $this->protectedCells [$pRange] ))
    {
      unset ( $this->protectedCells [$pRange] );
    }
    else
    {
      throw new PHPExcel_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 $pAlreadyHashed
   *          If the password has already been hashed, set this to true
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function unprotectCellsByColumnAndRow($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
   *
   * @return PHPExcel_Worksheet_AutoFilter
   */
  public function getAutoFilter()
  {
    return $this->autoFilter;
  }
  
  /**
   * Set AutoFilter
   *
   * @param PHPExcel_Worksheet_AutoFilter|string $pValue
   *          A simple string containing a Cell range like 'A1:E10' is permitted for backward compatibility
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function setAutoFilter($pValue)
  {
    $pRange = strtoupper ( $pValue );
    if (is_string ( $pValue ))
    {
      $this->autoFilter->setRange ( $pValue );
    }
    elseif (is_object ( $pValue ) && ($pValue instanceof PHPExcel_Worksheet_AutoFilter))
    {
      $this->autoFilter = $pValue;
    }
    return $this;
  }
  
  /**
   * Set Autofilter Range by using numeric cell coordinates
   *
   * @param integer $pColumn1
   *          Numeric column coordinate of the first cell
   * @param integer $pRow1
   *          Numeric row coordinate of the first cell
   * @param integer $pColumn2
   *          Numeric column coordinate of the second cell
   * @param integer $pRow2
   *          Numeric row coordinate of the second cell
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function setAutoFilterByColumnAndRow($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->setRange ( null );
    return $this;
  }
  
  /**
   * Get Freeze Pane
   *
   * @return string
   */
  public function getFreezePane()
  {
    return $this->freezePane;
  }
  
  /**
   * Freeze Pane
   *
   * @param string $pCell
   *          Cell (i.e. A2)
   *          Examples:
   *          A2 will freeze the rows above cell A2 (i.e row 1)
   *          B1 will freeze the columns to the left of cell B1 (i.e column A)
   *          B2 will freeze the rows above and to the left of cell A2
   *          (i.e row 1 and column A)
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function freezePane($pCell = '')
  {
    // Uppercase coordinate
    $pCell = strtoupper ( $pCell );
    if (strpos ( $pCell, ':' ) === false && strpos ( $pCell, ',' ) === false)
    {
      $this->freezePane = $pCell;
    }
    else
    {
      throw new PHPExcel_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 $pRow
   *          Numeric row coordinate of the cell
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function freezePaneByColumnAndRow($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 $pNumRows
   *          Number of rows to insert
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function insertNewRowBefore($pBefore = 1, $pNumRows = 1)
  {
    if ($pBefore >= 1)
    {
      $objReferenceHelper = PHPExcel_ReferenceHelper::getInstance ();
      $objReferenceHelper->insertNewBefore ( 'A' . $pBefore, 0, $pNumRows, $this );
    }
    else
    {
      throw new PHPExcel_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 $pNumCols
   *          Number of columns to insert
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function insertNewColumnBefore($pBefore = 'A', $pNumCols = 1)
  {
    if (! is_numeric ( $pBefore ))
    {
      $objReferenceHelper = PHPExcel_ReferenceHelper::getInstance ();
      $objReferenceHelper->insertNewBefore ( $pBefore . '1', $pNumCols, 0, $this );
    }
    else
    {
      throw new PHPExcel_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 $pNumCols
   *          Number of columns to insert
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function insertNewColumnBeforeByIndex($pBefore = 0, $pNumCols = 1)
  {
    if ($pBefore >= 0)
    {
      return $this->insertNewColumnBefore ( PHPExcel_Cell::stringFromColumnIndex ( $pBefore ), $pNumCols );
    }
    else
    {
      throw new PHPExcel_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 $pNumRows
   *          Number of rows to remove
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function removeRow($pRow = 1, $pNumRows = 1)
  {
    if ($pRow >= 1)
    {
      $highestRow = $this->getHighestDataRow ();
      $objReferenceHelper = PHPExcel_ReferenceHelper::getInstance ();
      $objReferenceHelper->insertNewBefore ( 'A' . ($pRow + $pNumRows), 0, - $pNumRows, $this );
      for($r = 0; $r < $pNumRows; ++ $r)
      {
        $this->getCellCacheController ()
          ->removeRow ( $highestRow );
        -- $highestRow;
      }
    }
    else
    {
      throw new PHPExcel_Exception ( "Rows to be deleted should at least start from row 1." );
    }
    return $this;
  }
  
  /**
   * Remove a column, updating all possible related data
   *
   * @param string $pColumn
   *          Remove starting with this one
   * @param int $pNumCols
   *          Number of columns to remove
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function removeColumn($pColumn = 'A', $pNumCols = 1)
  {
    if (! is_numeric ( $pColumn ))
    {
      $highestColumn = $this->getHighestDataColumn ();
      $pColumn = PHPExcel_Cell::stringFromColumnIndex ( PHPExcel_Cell::columnIndexFromString ( $pColumn ) - 1 + $pNumCols );
      $objReferenceHelper = PHPExcel_ReferenceHelper::getInstance ();
      $objReferenceHelper->insertNewBefore ( $pColumn . '1', - $pNumCols, 0, $this );
      for($c = 0; $c < $pNumCols; ++ $c)
      {
        $this->getCellCacheController ()
          ->removeColumn ( $highestColumn );
        $highestColumn = PHPExcel_Cell::stringFromColumnIndex ( PHPExcel_Cell::columnIndexFromString ( $highestColumn ) - 2 );
      }
    }
    else
    {
      throw new PHPExcel_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 $pNumCols
   *          Number of columns to remove
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function removeColumnByIndex($pColumn = 0, $pNumCols = 1)
  {
    if ($pColumn >= 0)
    {
      return $this->removeColumn ( PHPExcel_Cell::stringFromColumnIndex ( $pColumn ), $pNumCols );
    }
    else
    {
      throw new PHPExcel_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 $pCellCoordinate
   *          Cell coordinate to get comment for
   * @return PHPExcel_Comment
   * @throws PHPExcel_Exception
   */
  public function getComment($pCellCoordinate = 'A1')
  {
    // Uppercase coordinate
    $pCellCoordinate = strtoupper ( $pCellCoordinate );
    
    if (strpos ( $pCellCoordinate, ':' ) !== false || strpos ( $pCellCoordinate, ',' ) !== false)
    {
      throw new PHPExcel_Exception ( 'Cell coordinate string can not be a range of cells.' );
    }
    elseif (strpos ( $pCellCoordinate, '$' ) !== false)
    {
      throw new PHPExcel_Exception ( 'Cell coordinate string must not be absolute.' );
    }
    elseif ($pCellCoordinate == '')
    {
      throw new PHPExcel_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 $pCoordinate
   *          Cell (i.e. A1)
   * @return PHPExcel_Worksheet
   */
  public function setSelectedCell($pCoordinate = 'A1')
  {
    return $this->setSelectedCells ( $pCoordinate );
  }
  
  /**
   * Select a range of cells.
   *
   * @param string $pCoordinate
   *          Cell range, examples: 'A1', 'B2:G5', 'A:C', '3:6'
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function setSelectedCells($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 $pRow
   *          Numeric row coordinate of the cell
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function setSelectedCellByColumnAndRow($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 $strictNullComparison
   *          Apply strict comparison when testing for null values in the array
   * @throws PHPExcel_Exception
   * @return PHPExcel_Worksheet
   */
  public function fromArray($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 PHPExcel_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
    $r = - 1;
    for($row = $minRow; $row <= $maxRow; ++ $row)
    {
      $rRef = ($returnCellRef) ? $row : ++ $r;
      $c = - 1;
      // Loop through columns in the current row
      for($col = $minCol; $col != $maxCol; ++ $col)
      {
        $cRef = ($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 && $style->getNumberFormat ()) ? $style->getNumberFormat ()
                ->getFormatCode () : PHPExcel_Style_NumberFormat::FORMAT_GENERAL );
            }
          }
          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 $returnCellRef
   *          False - Return a simple array of rows and columns indexed by number counting from zero
   *          True - Return rows and columns indexed by their actual row and column IDs
   * @return array
   * @throws PHPExcel_Exception
   */
  public function namedRangeToArray($pNamedRange = '', $nullValue = null, $calculateFormulas = true, $formatData = true, $returnCellRef = false)
  {
    $namedRange = PHPExcel_NamedRange::resolveRange ( $pNamedRange, $this );
    if ($namedRange !== null)
    {
      $pWorkSheet = $namedRange->getWorksheet ();
      $pCellRange = $namedRange->getRange ();
      
      return $pWorkSheet->rangeToArray ( $pCellRange, $nullValue, $calculateFormulas, $formatData, $returnCellRef );
    }
    
    throw new PHPExcel_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
   *
   * @param integer $startRow
   *          The row number at which to start iterating
   * @param integer $endRow
   *          The row number at which to stop iterating
   *          
   * @return PHPExcel_Worksheet_RowIterator
   */
  public function getRowIterator($startRow = 1, $endRow = null)
  {
    return new PHPExcel_Worksheet_RowIterator ( $this, $startRow, $endRow );
  }
  
  /**
   * Get column iterator
   *
   * @param string $startColumn
   *          The column address at which to start iterating
   * @param string $endColumn
   *          The column address at which to stop iterating
   *          
   * @return PHPExcel_Worksheet_ColumnIterator
   */
  public function getColumnIterator($startColumn = 'A', $endColumn = null)
  {
    return new PHPExcel_Worksheet_ColumnIterator ( $this, $startColumn, $endColumn );
  }
  
  /**
   * Run PHPExcel garabage collector.
   *
   * @return PHPExcel_Worksheet
   */
  public function garbageCollect()
  {
    // Flush cache
    $this->cellCollection->getCacheData ( 'A1' );
    // 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
    $colRow = $this->cellCollection->getHighestRowAndColumn ();
    $highestRow = $colRow ['row'];
    $highestColumn = PHPExcel_Cell::columnIndexFromString ( $colRow ['column'] );
    
    // 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 $pCoordinate          
   * @return boolean
   */
  public function hyperlinkExists($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 $pCoordinate          
   * @return boolean
   */
  public function dataValidationExists($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 ($this->tabColor === null)
    {
      $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 ($this->tabColor !== null);
  }
  
  /**
   * 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 = $newCollection;
        }
        elseif (($key == 'autoFilter') && ($this->autoFilter instanceof PHPExcel_Worksheet_AutoFilter))
        {
          $newAutoFilter = clone $this->autoFilter;
          $this->autoFilter = $newAutoFilter;
          $this->autoFilter->setParent ( $this );
        }
        else
        {
          $this->{$key} = unserialize ( serialize ( $val ) );
        }
      }
    }
  }
  /**
   * Define the code name of the sheet
   *
   * @param
   *          null|string Same rule as Title minus space not allowed (but, like Excel, change silently space to underscore)
   * @return objWorksheet
   * @throws PHPExcel_Exception
   */
  public function setCodeName($pValue = null)
  {
    // Is this a 'rename' or not?
    if ($this->getCodeName () == $pValue)
    {
      return $this;
    }
    $pValue = str_replace ( ' ', '_', $pValue ); // Excel does this automatically without flinching, we are doing the same
                                              // Syntax check
                                              // throw an exception if not valid
    self::checkSheetCodeName ( $pValue );
    
    // We use the same code that setTitle to find a valid codeName else not using a space (Excel don't like) but a '_'
    
    if ($this->getParent ())
    {
      // Is there already such sheet name?
      if ($this->getParent ()
        ->sheetCodeNameExists ( $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 ()
          ->sheetCodeNameExists ( $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 );
            }
          }
        }
        
        $pValue = $pValue . '_' . $i; // ok, we have a valid name
                                        // codeName is'nt used in formula : no need to call for an update
                                        // return $this->setTitle($altTitle, $updateFormulaCellReferences);
      }
    }
    
    $this->codeName = $pValue;
    return $this;
  }
  /**
   * Return the code name of the sheet
   *
   * @return null|string
   */
  public function getCodeName()
  {
    return $this->codeName;
  }
  /**
   * Sheet has a code name ?
   * 
   * @return boolean
   */
  public function hasCodeName()
  {
    return ! (is_null ( $this->codeName ));
  }
}
