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From "John Camelon" <jo...@taralnetworks.com>
Subject RE: incremental building
Date Thu, 10 May 2001 16:44:57 GMT
thanks for the answer.  :)

i would be interesting in investigating a mechanism to try and integrate
such a heuristic into an interface that a task could implement, such that
you could have real incremental conditions on any task that wanted it.  this
is a problem that comes up often in the non-java world.

johnc

> -----Original Message-----
> From: Stefan Bodewig [mailto:bodewig@apache.org]
> Sent: Thursday, May 10, 2001 2:36 AM
> To: ant-user@jakarta.apache.org
> Subject: Re: incremental building
>
>
> John Camelon <johnc@taralnetworks.com> wrote:
>
> > the inherent timestamping using </tstamp> doesn't determine that
> > these IDL's don't need to be regenerated
>
> I think you are expecting far too much from the tstamp task - it just
> sets a couple of properties initializing them from the current time.
>
> What you really want is either <uptodate> or <apply>.  Assuming an
> idlcompiler named idl2java that creates Foo.java from Foo.idl (totally
> made up, I'm sure things are little bit more complicated at your site,
> but to give you an idea) you could do:
>
> <uptodate property="no-idl-regen" targetfile="Foo.java">
>   <srcfiles dir="." includes="Foo.idl" />
> </uptodate>
>
> <target .... unless="no-idl-regen">
>   run idl2java on Foo.idl
> </target>
>
> or to do this in one pass (mapping all .idl files to .java files and
> processing them in a single task):
>
> <apply executable="idl2java">
>   <srcfile />
>
>   <fileset dir="." includes="**/*.idl" />
>   <mapper type="glob" from="*.idl" to="*.java" />
> </apply>
>
> which will recursively scan your basedir for files with the extension
> .idl, compare their last modification time with the one of the
> corresponding .java file (if present) and run the command if (1) the
> .java file is not there or (2) is older than the .idl file.
>
> Stefan
>


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