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This class performs all of the comparisons behind the sync operation
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This function preforms the actual comparisons. The parameters it takes
are the generated files for both the source and the destination. The
key concept in this function is that no matter the type of where the
files are coming from, they are listed in the same order, least to
greatest in collation order. This allows for easy comparisons to
determine if file needs to be added or deleted. Comparison keys are
used to determine if two files are the same and each file has a
unique comparison key. If they are the same compare the size and
last modified times to see if a file needs to be updated. Ultimately,
it will yield a sequence of file info objectsthat will be sent to
the ``S3Handler``.
:param src_files: The generated FileInfo objects from the source.
:param dest_files: The generated FileInfo objects from the dest.
:returns: Yields the FilInfo objects of the files that need to be
operated on
Algorithm:
Try to take next from both files. If it is empty signal
corresponding done flag. If both generated lists are not done
compare compare_keys. If equal, compare size and time to see if
it needs to be updated. If source compare_key is less than dest
compare_key, the file needs to be added to the destination. Take
the next source file but not not destination file. If the source
compare_key is greater than dest compare_key, that destination file
needs to be deleted from the destination. Take the next dest file
but not the source file. If the source list is empty delete the
rest of the files in the dest list from the destination. If the
dest list is empty add the rest of the file in source list to
the destination.
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Determines if the source compare_key is less than, equal to,
or greater than the destination compare_key
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