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From Patrick Martin <antu...@gmail.com>
Subject Re: zip from zip with mappers
Date Tue, 20 Nov 2012 11:01:08 GMT
Hello,

Thank you for your reply,

Is there any way this can be available, in the compress antlib maybe?
Is the addition of <mapper> support directly in <zip> not possible either
(so we could make use of the zipfileset nested directly, but mapping zip
entry names at the last step)?

Thank you again,

Patrick


On Tue, Nov 20, 2012 at 6:05 AM, Stefan Bodewig <bodewig@apache.org> wrote:

> On 2012-11-19, Patrick Martin wrote:
>
> > I have a situation where I need to create an archive (zip) from an other
> > one, but transforming some path inside. I want to avoid using a temporary
> > folder structure as the input files contains a huge amount of entries
> > (about 125000...) and this generates quite a lot of I/Os.
>
> > I was thinking of using <zip> and <zipfileset>. However, as <zip>
does
> not
> > support <mapper>, it is not possible directly.
>
> > So I thought of using the <mappedresources> resource collection:
> > <zip destfile="dest.zip">
> > <mappedresources enablemultiplemappings="true">
> > <zipfileset src="src.zip" includes="**" />
> > <firstmatchmapper> <mapper type="glob" from="fromfolder\*"
> to="tofolder\*"
> > /> <identitymapper /> </firstmatchmapper>
> > </mappedresources>
> > </zip>
>
> > The mapping is done quite fast but then zip is reeaaally slow (can be
> seen
> > when running in verbose mode).
>
> Yes, this is a known problem with the way Ant deals with zipfileset.
>
> > My guess is that Ant will look for each resource individually and thus
> > scan the source zip each time.
>
> It's even worse.  The ZIP file will be reopened and the central
> directory re-parsed every time an entry is read.  This is avoided by
> special code inside the zip task when the zipfileset is nested directly
> into the task.
>
> > Is there any other possibility to achieve zip to zip transfer with
> mapping
> > / transformation (and filtering with include/exclude patterns) ?
> > Or is there any way to add <mapper> support in <zip> ?
>
> Filtering should work by using zipfileset directly.  As for mapping, I'm
> afraid there is no real solution - apart from coding the ZIP creation
> directly in Java.
>
> Stefan
>
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