I found a case for a reversal of the standard composite today.
Basically, a class that works from a collection of leaf classes, that works its way up to the root.
Not sure if there is a pattern relating to this kind of need in another catalogue, but it seemed simple enough to reverse the GOF composite.
I need to expand on this idea over the next few weeks, and coalesce it with the decorator, builder and abstract factory patterns.
One of the main reasons behind this is multiple paths to a set endpoint. The root becomes the set endpoint where by we can plot a course from a leaf.
The Leaf though is where we start from and full knowledge of all leaves should be known at the outset.
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