public DozerBeanMapperBuilder withBeanFactorys(Map<String, BeanFactory> beanFactories) {
        if (beanFactories != null) {
            this.beanFactories.putAll(beanFactories);
        }
        return this;
    }
Registers a {@link BeanFactory} for the mapper.
Consecutive calls of this method with the same factory name will override previously provided value.
<p>
By default, no custom bean factories are registered.

@param beanFactories factory's to be used by mapper.
@return modified builder to be further configured.
core/src/main/java/com/github/dozermapper/core/DozerBeanMapperBuilder.java