code: public function loadMetadataForClass($className, ClassMetadataInterface $metadata)
      {
          if (false === $metadata instanceof ClassMetadata) {
              throw new MappingException(
                  sprintf('Metadata is of class "%s" instead of "%s"', get_class($metadata), ClassMetadata::class)
              );
          }
  
          if (false === isset($this->classMap[$className])) {
              throw new MappingException(
                  sprintf('No configured mapping for document "%s"', $className)
              );
          }
  
          $mappingClassName = $this->classMap[$className];
  
          if (false === ($mapping = new $mappingClassName()) instanceof ClassMapMappingInterface) {
              throw new MappingException(
                  sprintf('Class "%s" does not implement the "%s"', $mappingClassName, ClassMapMappingInterface::class)
              );
          }
  
          $mapping->configureMapping($metadata);
      }
docs: @param string                 $className
  @param ClassMetadataInterface $metadata
  
  @throws MappingException