Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition

34.13. Configuring Mappers with a MapperFactory

Similar to previous examples of factories in the case study, the configuration of the PersistenceFacade with a set of IMapper objects can be achieved with a factory object, MapperFactory. However, as a slight twist, it is desirable to not name each mapper with a different operation. For example, this is not desirable:

						class MapperFactory
						{
						public IMapper getProductSpecificationMapper() {...}
						public IMapper getSaleMapper() {...}
						...
						}
					

This does not support Protected Variations with respect to a growing list of mappers—and it will grow. Consequently, the following is preferred:

						class MapperFactory
						{
						public Map getAllMappers() {...}
						...
						}
					

where the java.util.Map (probably implemented with a HashMap ...