Dear Devon,
a few things:

-0- we should really get rid of this CatalogManager as is (a class
with only static methods as its state its spread over N other classes)
-1- we can already mosaick images with different colormodels (to a
certain extent, it does not make sense to mosaick a float raster with
an RGB). RGB, Gray and Palette can be mosaicked as of today
-4- I would add some UML diagrams to your proposal to show what we
have now and what we have afterwards

I noticed that you are half-way through with your refactor and its
probably too early to look into it but I have two things I wanted to
bring up.
First of all, I believe you shuold look at the refactor of the
indexing together with this, I would not split them otherwise your
refactor in this case could be too narrow.
Let me explain, your goal here is to improve the harvesting process
allowing implementors to change how harvested elements are discarded
as well as how they are preprocessed or manipulated and this is not
isolated from the harvesting itself.

I believe catalogmanager (although) the nice name, might go away and
this kind of behavior could be isolated into smaller API likewise we
did with the properties collector so that one can drop them inside the
imagemosaic and ask it through the indexmanager to apply them.
Ideally one could rather write its one harvester and completely
customize how we put things inside the GranuleCatalog.

Let me know what you think about this.


Regards,
Simone Giannecchini
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On Tue, Jun 14, 2016 at 8:09 PM, Devon Tucker <devonrtuc...@gmail.com> wrote:
> Hi all,
>
> After discussions about the ImageMosaic API proposal we have decided to
> break it up into a few smaller pieces that are hopefully both more
> manageable to implement and easier to understand. First up is a proposal to
> refactor the ImageMosaic CatalogManager to allow parts of it to be
> overridden. The first new proposal is here:
>
> https://github.com/geotools/geotools/wiki/Refactor-ImageMosaic-Index-and-Catalog-management-for-improved-extensibility
>
> I've been doing the work on my own branch here:
>
> https://github.com/dvntucker/geotools/tree/im_api_refactor
>
> Further to that, I have another branch where I've been storing R&D work done
> against that branch. Most of that work was done much earlier, but I've been
> porting my previous test cases to the new branch as I go along for
> verification purposes.
>
> Please take a look and let me know if there's anything that isn't clear.
> This proposal is much simpler than the previous one.
>
> Cheers
>
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