Spring Framework uses the adapter design pattern to implement a lot of functionality across the framework transparently. The following are some listed classes based on the adapter design pattern in the Spring Framework:
- JpaVendorAdapter
- HibernateJpaVendorAdapter
- HandlerInterceptorAdapter
- MessageListenerAdapter
- SpringContextResourceAdapter
- ClassPreProcessorAgentAdapter
- RequestMappingHandlerAdapter
- AnnotationMethodHandlerAdapter
- WebMvcConfigurerAdapter
The UML diagram for the adapter pattern
Let's understand the preceding UML diagram that illustrates the components of the adapter design pattern:
- The Target Interface: This is the desired interface class that will be used by the clients
- The Adapter class: This class is a wrapper class that implements the desired target interface and modifies the specific request available from the Adaptee class
- The Adaptee class: This is the class that is used by the Adapter class to reuse the existing functionalities and modify them for desired use
- Client: This class will interact with the Adapter class
Let's look at the following sample implementation of the adapter design pattern.