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This is a feature that helps ELAPI.
It makes lookup of the fields that need
to be resolved for every event a bit faster.
The idea is to be able to put a 'pin'
into a specific place while iterating
the collection and make this place a new
"wrap around" place for the collection.
This means that next time you
iterate this collection you will start
iterating from the next item and
the item you got before pin will be last
in your iteration cycle.
Here is the example:
Assume you have two collections that you need
to compare and perform some action on collection
1 based on the presense of the item in collection 2.
Collection1 = A, B, C, D, E. F
Collection2 = A, C, F
The usual approach is to try A from collection 1
against A, B, C from collection 2. "A" will be found
right away. But to find "F" it has to be compared
to "A" and "C" first. The fact that the collections
are to some extent ordered can in some cases
help to reduce the number of comparisons.
If we found "C" in the list we can put a "pin"
into the collection there causing the iterator
to warp at this "pin" point. Since "D" and "E"
are not in the second collection we will have
to make same amount of comparisons in traditional
or "pinned" case to not find them.
To find "F" in pinned case there will be just one
comparison.
Traditional case = 1 + 3 + 2 + 3 + 3 + 3 = 15
Pinned case = 1 + 3 + 1 + 3 + 3 + 1 = 12
It is a 20% comparison reduction.
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Created a new module to hold functions
related to iterator and iterating
collections. Planning to add new functions
but the main collection module is already
too big. So this patch just moves code around
and fixes the build making foundation for
the next patch.
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The collection is hearachical. The flattening
of the collection was not implemented before
both for traversal and copying. This patch
introduces functionality to traverse or
iterate through collection as flat set
and also copy collection into another flattening
it and automatically resolving conflicts.
Also imptoved tracability and fixed memory leak
in unbind iterator code.
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There was a static global structure used in iteration and in
traversing the collection. It has been removed and replaced with
a better solution.
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Add was always insterting at the end of the collection.
With this change one can control where the item is
inserted and deal with the duplicates too.
Also one now can extract items from collection
using absolute and relative disposition.
Using more advanced hashing function.
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