public static boolean validSourceAndTarget( final Object source, final Object target, final TransformationConfig config) { final Model sourceModel = source instanceof Model ? (Model) source : null; final Model targetModel = target instanceof Model ? (Model) target : null; if (sourceModel != null && Util.type(sourceModel)) { return false; } if (targetModel != null && Util.type(targetModel)) { return false; } if (sourceModel != null && targetModel != null) { if (config.getMapping(sourceModel, targetModel) != null) { return false; } if (sourceModel.isCollection() && targetModel.isCollection()) { return false; } } return true; }