code: private void invokeFactoryMethod(MethodDefinition read, Map<Short, LocalVariableDefinition> structData, LocalVariableDefinition instance)
      {
          if (metadata.getBuilderMethod().isPresent()) {
              ThriftMethodInjection builderMethod = metadata.getBuilderMethod().get();
              read.loadVariable(instance);
  
              // push parameters on stack
              for (ThriftParameterInjection parameter : builderMethod.getParameters()) {
                  read.loadVariable(structData.get(parameter.getId()));
              }
  
              // invoke the method
              read.invokeVirtual(builderMethod.getMethod())
                      .storeVariable(instance);
          }
      }
docs: Defines the code that calls the builder factory method.