<?php
/**
* PHPExcel
*
* Copyright (c) 2006 - 2012 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_CachedObjectStorage
* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version 1.7.8, 2012-10-12
*/
/**
* PHPExcel_CachedObjectStorage_CacheBase
*
* @category PHPExcel
* @package PHPExcel_CachedObjectStorage
* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
*/
abstract class PHPExcel_CachedObjectStorage_CacheBase {
/**
* Parent worksheet
*
* @var PHPExcel_Worksheet
*/
protected $_parent;
/**
* The currently active Cell
*
* @var PHPExcel_Cell
*/
protected $_currentObject = null;
/**
* Coordinate address of the currently active Cell
*
* @var string
*/
protected $_currentObjectID = null;
/**
* Flag indicating whether the currently active Cell requires saving
*
* @var boolean
*/
protected $_currentCellIsDirty = true;
/**
* An array of cells or cell pointers for the worksheet cells held in this cache,
* and indexed by their coordinate address within the worksheet
*
* @var array of mixed
*/
protected $_cellCache = array();
/**
* Initialise this new cell collection
*
* @param PHPExcel_Worksheet $parent The worksheet for this cell collection
*/
public function __construct(PHPExcel_Worksheet $parent) {
// Set our parent worksheet.
// This is maintained within the cache controller to facilitate re-attaching it to PHPExcel_Cell objects when
// they are woken from a serialized state
$this->_parent = $parent;
} // function __construct()
/**
* Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
*
* @param string $pCoord Coordinate address of the cell to check
* @return boolean
*/
public function isDataSet($pCoord) {
if ($pCoord === $this->_currentObjectID) {
return true;
}
// Check if the requested entry exists in the cache
return isset($this->_cellCache[$pCoord]);
} // function isDataSet()
/**
* Add or Update a cell in cache
*
* @param PHPExcel_Cell $cell Cell to update
* @return void
* @throws Exception
*/
public function updateCacheData(PHPExcel_Cell $cell) {
return $this->addCacheData($cell->getCoordinate(),$cell);
} // function updateCacheData()
/**
* Delete a cell in cache identified by coordinate address
*
* @param string $pCoord Coordinate address of the cell to delete
* @throws Exception
*/
public function deleteCacheData($pCoord) {
if ($pCoord === $this->_currentObjectID) {
$this->_currentObject->detach();
$this->_currentObjectID = $this->_currentObject = null;
}
if (is_object($this->_cellCache[$pCoord])) {
$this->_cellCache[$pCoord]->detach();
unset($this->_cellCache[$pCoord]);
}
$this->_currentCellIsDirty = false;
} // function deleteCacheData()
/**
* Get a list of all cell addresses currently held in cache
*
* @return array of string
*/
public function getCellList() {
return array_keys($this->_cellCache);
} // function getCellList()
/**
* Sort the list of all cell addresses currently held in cache by row and column
*
* @return void
*/
public function getSortedCellList() {
$sortKeys = array();
foreach ($this->getCellList() as $coord) {
list($column,$row) = sscanf($coord,'%[A-Z]%d');
$sortKeys[sprintf('%09d%3s',$row,$column)] = $coord;
}
ksort($sortKeys);
return array_values($sortKeys);
} // function sortCellList()
/**
* Get highest worksheet column and highest row that have cell records
*
* @return array Highest column name and highest row number
*/
public function getHighestRowAndColumn()
{
// Lookup highest column and highest row
$col = array('A' => '1A');
$row = array(1);
foreach ($this->getCellList() as $coord) {
list($c,$r) = sscanf($coord,'%[A-Z]%d');
$row[$r] = $r;
$col[$c] = strlen($c).$c;
}
if (!empty($row)) {
// Determine highest column and row
$highestRow = max($row);
$highestColumn = substr(max($col),1);
}
return array( 'row' => $highestRow,
'column' => $highestColumn
);
}
/**
* Get highest worksheet column
*
* @return string Highest column name
*/
public function getHighestColumn()
{
$colRow = $this->getHighestRowAndColumn();
return $colRow['column'];
}
/**
* Get highest worksheet row
*
* @return int Highest row number
*/
public function getHighestRow()
{
$colRow = $this->getHighestRowAndColumn();
return $colRow['row'];
}
/**
* Generate a unique ID for cache referencing
*
* @return string Unique Reference
*/
protected function _getUniqueID() {
if (function_exists('posix_getpid')) {
$baseUnique = posix_getpid();
} else {
$baseUnique = mt_rand();
}
return uniqid($baseUnique,true);
}
/**
* Clone the cell collection
*
* @param PHPExcel_Worksheet $parent The new worksheet
* @return void
*/
public function copyCellCollection(PHPExcel_Worksheet $parent) {
$this->_parent = $parent;
if (($this->_currentObject !== NULL) && (is_object($this->_currentObject))) {
$this->_currentObject->attach($parent);
}
} // function copyCellCollection()
/**
* Identify whether the caching method is currently available
* Some methods are dependent on the availability of certain extensions being enabled in the PHP build
*
* @return boolean
*/
public static function cacheMethodIsAvailable() {
return true;
}
}
