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<?php

/**
 * Class TNW_Salesforce_Model_Observer
 */
class TNW_Salesforce_Model_Observer
{
 
    public function syncMappingOrderitemBefore(Varien_Event_Observer $observer) {
        /**
         * Mapping objects
         * @var TNW_Salesforce_Model_Sync_Mapping_Order_Order_Item $_mapping 
         * 
         * Example:
         *     object(TNW_Salesforce_Model_Sync_Mapping_Order_Order_Item)[558]
         *       protected '_type' => string 'OrderItem' (length=9)	// used $_mapping->getType()
         *       protected '_allowedMappingTypes' => 				// used $_mapping->getAllowedMappingTypes()
         *         array (size=4)
         *           0 => string 'Cart' (length=4)
         *           1 => string 'Product Inventory' (length=17)
         *           2 => string 'Product' (length=7)
         *           3 => string 'Custom' (length=6)
         *       protected '_mappingCollection' => null              // used $_mapping->getMappingCollection()
         *       protected '_sync' =>                                // used $_mapping->getSync()
         *         object(TNW_Salesforce_Helper_Salesforce_Order)
         *       ...
         */
        $_mapping = $observer->getData('mapping');
 
        /**
         * Entity objects
         * @var Mage_Sales_Model_Order_Item $_entity 
         */
        $_entity = $observer->getData('entity');
 
        /**
         * Additional entity objects
         * @var Mage_Catalog_Model_Product $_additional_object 
         */
        $_additional_object = $observer->getData('additionalObject');

		// Your custom code
    }
 
}