/**
  * Returns source adapter object.
  *
  * @param array $sourceData Array Source Data
  *
  * @return AvS_FastSimpleImport_Model_ArrayAdapter
  */
 protected function _getSourceAdapter($sourceData)
 {
     if (is_array($sourceData)) {
         if ($this->getUseNestedArrays()) {
             return Mage::getModel('fastsimpleimport/nestedArrayAdapter', $sourceData);
         } else {
             return Mage::getModel('fastsimpleimport/arrayAdapter', $sourceData);
         }
     }
     return parent::_getSourceAdapter($sourceData);
 }