<?php
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/**
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* PHPExcel
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*
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* Copyright (c) 2006 - 2012 PHPExcel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* @category PHPExcel
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* @package PHPExcel_CachedObjectStorage
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* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
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* @version 1.7.7, 2012-05-19
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*/
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/**
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* PHPExcel_CachedObjectStorage_CacheBase
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*
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* @category PHPExcel
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* @package PHPExcel_CachedObjectStorage
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* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
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*/
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class PHPExcel_CachedObjectStorage_CacheBase {
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/**
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* Parent worksheet
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*
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* @var PHPExcel_Worksheet
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*/
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protected $_parent;
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/**
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* The currently active Cell
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*
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* @var PHPExcel_Cell
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*/
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protected $_currentObject = null;
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/**
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* Coordinate address of the currently active Cell
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*
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* @var string
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*/
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protected $_currentObjectID = null;
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/**
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* Flag indicating whether the currently active Cell requires saving
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*
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* @var boolean
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*/
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protected $_currentCellIsDirty = true;
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/**
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* An array of cells or cell pointers for the worksheet cells held in this cache,
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* and indexed by their coordinate address within the worksheet
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*
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* @var array of mixed
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*/
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protected $_cellCache = array();
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/**
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* Initialise this new cell collection
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*
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* @param PHPExcel_Worksheet $parent The worksheet for this cell collection
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*/
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public function __construct(PHPExcel_Worksheet $parent) {
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// Set our parent worksheet.
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// This is maintained within the cache controller to facilitate re-attaching it to PHPExcel_Cell objects when
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// they are woken from a serialized state
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$this->_parent = $parent;
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} // function __construct()
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/**
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* Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
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*
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* @param string $pCoord Coordinate address of the cell to check
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* @return boolean
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*/
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public function isDataSet($pCoord) {
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if ($pCoord === $this->_currentObjectID) {
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return true;
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}
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// Check if the requested entry exists in the cache
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return isset($this->_cellCache[$pCoord]);
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} // function isDataSet()
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/**
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* Add or Update a cell in cache
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*
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* @param PHPExcel_Cell $cell Cell to update
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* @return void
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* @throws Exception
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*/
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public function updateCacheData(PHPExcel_Cell $cell) {
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return $this->addCacheData($cell->getCoordinate(),$cell);
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} // function updateCacheData()
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/**
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* Delete a cell in cache identified by coordinate address
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*
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* @param string $pCoord Coordinate address of the cell to delete
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* @throws Exception
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*/
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public function deleteCacheData($pCoord) {
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if ($pCoord === $this->_currentObjectID) {
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$this->_currentObject->detach();
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$this->_currentObjectID = $this->_currentObject = null;
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}
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if (is_object($this->_cellCache[$pCoord])) {
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$this->_cellCache[$pCoord]->detach();
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unset($this->_cellCache[$pCoord]);
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}
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$this->_currentCellIsDirty = false;
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} // function deleteCacheData()
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/**
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* Get a list of all cell addresses currently held in cache
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*
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* @return array of string
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*/
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public function getCellList() {
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return array_keys($this->_cellCache);
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} // function getCellList()
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/**
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* Sort the list of all cell addresses currently held in cache by row and column
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*
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* @return void
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*/
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public function getSortedCellList() {
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$sortKeys = array();
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foreach ($this->getCellList() as $coord) {
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list($column,$row) = sscanf($coord,'%[A-Z]%d');
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$sortKeys[sprintf('%09d%3s',$row,$column)] = $coord;
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}
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ksort($sortKeys);
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return array_values($sortKeys);
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} // function sortCellList()
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/**
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* Get highest worksheet column and highest row that have cell records
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*
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* @return array Highest column name and highest row number
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*/
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public function getHighestRowAndColumn()
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{
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// Lookup highest column and highest row
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$col = array('A' => '1A');
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$row = array(1);
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foreach ($this->getCellList() as $coord) {
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list($c,$r) = sscanf($coord,'%[A-Z]%d');
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$row[$r] = $r;
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$col[$c] = strlen($c).$c;
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}
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if (!empty($row)) {
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// Determine highest column and row
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$highestRow = max($row);
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$highestColumn = substr(max($col),1);
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}
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return array( 'row' => $highestRow,
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'column' => $highestColumn
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);
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}
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/**
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* Get highest worksheet column
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*
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* @return string Highest column name
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*/
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public function getHighestColumn()
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{
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$colRow = $this->getHighestRowAndColumn();
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return $colRow['column'];
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}
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/**
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* Get highest worksheet row
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*
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* @return int Highest row number
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*/
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public function getHighestRow()
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{
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$colRow = $this->getHighestRowAndColumn();
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return $colRow['row'];
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}
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/**
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* Generate a unique ID for cache referencing
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*
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* @return string Unique Reference
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*/
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protected function _getUniqueID() {
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if (function_exists('posix_getpid')) {
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$baseUnique = posix_getpid();
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} else {
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$baseUnique = mt_rand();
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}
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return uniqid($baseUnique,true);
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}
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/**
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* Clone the cell collection
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*
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* @param PHPExcel_Worksheet $parent The new worksheet
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* @return void
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*/
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public function copyCellCollection(PHPExcel_Worksheet $parent) {
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$this->_parent = $parent;
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if (($this->_currentObject !== NULL) && (is_object($this->_currentObject))) {
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$this->_currentObject->attach($parent);
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}
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} // function copyCellCollection()
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/**
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* Identify whether the caching method is currently available
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* Some methods are dependent on the availability of certain extensions being enabled in the PHP build
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*
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* @return boolean
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*/
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public static function cacheMethodIsAvailable() {
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return true;
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}
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}
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