src/Callbacks/CreateMultiselectOptionValueCallback.php
public function handle(AttributeCodeAndValueAwareObserverInterface $observer)
    {

        // set the observer
        $this->setObserver($observer);

        // load the attribute code and value
        $attributeCode = $observer->getAttributeCode();
        $attributeValue = $observer->getAttributeValue();

        // load the ID of the actual store
        $storeId = $this->getStoreId(StoreViewCodes::ADMIN);

        // explode the multiselect values
        $vals = explode('|', $attributeValue);

        // convert the option values into option value ID's
        foreach ($vals as $val) {
            $this->getOptionValueAndSwatchHandler()->createOptionValueIfNecessary($attributeCode, $storeId, $val);
        }

        // return the values
        return $attributeValue;
    }
public function handle(AttributeCodeAndValueAwareObserverInterface $observer)
    {

        // set the observer
        $this->setObserver($observer);

        // load the attribute code and value
        $attributeCode = $observer->getAttributeCode();
        $attributeValue = $observer->getAttributeValue();

        // load the ID of the actual store
        $storeId = $this->getStoreId(StoreViewCodes::ADMIN);

        // explode the multiselect values
        $vals = explode('|', $attributeValue);

        // convert the option values into option value ID's
        foreach ($vals as $val) {
            $this->getOptionValueAndSwatchHandler()->createOptionValueIfNecessary($attributeCode, $storeId, $val);
        }

        // return the values
        return $attributeValue;
    }
Will be invoked by a observer it has been registered for.

@param \TechDivision\Import\Observers\ObserverInterface $observer The observer

@return mixed The modified value