CacheBase.php

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<?php
class PHPExcel_CachedObjectStorage_CacheBase {

        protected $_parent;

        protected $_currentObject = null;

        protected $_currentObjectID = null;


        protected $_cellCache = array();


        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()


        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()


        public function updateCacheData(PHPExcel_Cell $cell) {
                return $this->addCacheData($cell->getCoordinate(),$cell);
        }       //      function updateCacheData()


        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]);
                }
        }       //      function deleteCacheData()


        public function getCellList() {
                return array_keys($this->_cellCache);
        }       //      function getCellList()


        public function getSortedCellList() {
                $sortKeys = array();
                foreach (array_keys($this->_cellCache) 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()


        protected function _getUniqueID() {
                if (function_exists('posix_getpid')) {
                        $baseUnique = posix_getpid();
                } else {
                        $baseUnique = mt_rand();
                }
                return uniqid($baseUnique,true);
        }

        public function copyCellCollection(PHPExcel_Worksheet $parent) {
                $this->_parent = $parent;
                if ((!is_null($this->_currentObject)) && (is_object($this->_currentObject))) {
                        $this->_currentObject->attach($parent);
                }
        }       //      function copyCellCollection()

}