Design Patterns Explained: A New Perspective on Object-Oriented Design

Thinking in Patterns: Step 2b

So, I retrace the design steps until I come to the context in which the Bridge pattern shows up. I want to build a system that translates CAD/CAM models into an NC set to give to a machine so that the part described by the model can be built (see Figure 12-3).

Figure 12-3. High-level view of system.

Of course, I had expanded this design by noting that I could use object-oriented design techniques to have the expert system use a Model class to get its information. Model would have two versions, one for each of the CAD/CAM systems. This is shown in Figure 12-4.

Figure 12-4. The classes to generate the NC set.

Remember, ...