/**
* Apply operation
*
* @param IOperation $operation
* @return void
*/
private function _applyOperation($operation)
{
$key = $operation->getKey();
$oldval = $this->get($key);
$newval = $operation->applyOn($oldval, $this);
if ($newval !== null) {
$this->_data[$key] = $newval;
} else {
if (isset($this->_data[$key])) {
unset($this->_data[$key]);
}
}
$prevOp = $this->_getPreviousOp($key);
$newOp = $prevOp ? $operation->mergeWith($prevOp) : $operation;
$this->_operationSet[$key] = $newOp;
}
