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But access to the Collection’s elements is encapsulated behind the additional level of abstraction called Iterator. Each Collection derived class knows which Iterator derived class to create and return. After that, the Client relies on the interface defined in the Iterator base class. Example The Iterator provides ways to access elements of an aggregate object sequentially without exposing the underlying structure of the object. Files are aggregate objects. In office settings where access to files is made through administrative or secretarial staff, the Iterator pattern is demonstrated with the secretary acting as the Iterator.

MacroCommands can be implemented with Composite. A Command that must be copied before being placed on a history list acts as a Prototype. Two important aspects of the Command pattern: interface separation (the invoker is isolated from the receiver), time separation (stores a ready-to-go processing request that's to be stated later). Command | 35 Composite Intent • Compose objects into tree structures to represent whole-part hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.

Decide if a "little language" offers a justifiable return on investment. 2. Define a grammar for the language. 3. Map each production in the grammar to a class. 4. Organize the suite of classes into the structure of the Composite pattern. 5. Define an interpret(Context) method in the Composite hierarchy. 6. The Context object encapsulates the current state of the input and output as the former is parsed and the latter is accumulated. It is manipulated by each grammar class as the "interpreting" process transforms the input into the output.

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