Java Reference
In-Depth Information
Figure 28.5. You can extend the ProcessComponent hierarchy to implement an Iterable
interface, allowing CompositeIterator to build new iterators for each child of
a composite node.
The ProcessComposite class can implement iterator() to return an instance of
CompositeIterator . The ProcessStep class can implement this method to return an
instance of LeafIterator .
CHALLENGE 28.2
What pattern are you applying if you let classes in the ProcessComponent
hierarchy implement iterator() to create instances of an appropriate iterator
class?
The ComponentIterator hierarchy is somewhat difficult to develop, but it is highly
reusable and easy to apply. For example, a short program can print the nodes of a composite,
using indentation to show each node's depth:
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