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List:       velocity-user
Subject:    Re: How to check Velocity version?
From:       sebb <sebbaz () gmail ! com>
Date:       2008-06-03 13:26:33
Message-ID: 25aac9fc0806030626j781f2432ve4e21cdcd1411b0b () mail ! gmail ! com
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On 02/06/2008, Will Glass-Husain <wglasshusain@gmail.com> wrote:
> Is there a way to check the manifest file?
>

Neat idea!

A manifest resource can be loaded using

<javaresource name="META-INF/MANIFEST.MF" classpath="${velocity.jar}"/>

but when I tried this it found one of the JVM manifests rather than
the velocity one.

I then tried <zipentry> instead, and this works:

<loadresource property="implementation.version">
<zipentry name="META-INF/MANIFEST.MF" archive="${velocity.jar}"/>
<filterchain>
<linecontains>
<contains value="Implementation-Version: "/>
</linecontains>
<tokenfilter>
<!-- Remove all but the revision number -->
<replaceregex pattern=".+: " replace=""/>
</tokenfilter>
</filterchain>
</loadresource>
<echo>${implementation.version}</echo>

However, this only applies if the script knows the name of the velocity jar.

If the jar is only available via a classpath, it gets a lot harder.

Maybe there should be an Ant task to look up / parse manifests...

>
>
>  On Mon, Jun 2, 2008 at 7:56 AM, sebb <sebbaz@gmail.com> wrote:
>
>  > That's what I ended up doing:
>  >
>  > <available classpathref="anakia.classpath"
>  > classname="org.apache.velocity.io.UnicodeInputStream"
>  > property="velocity.version.15"/>
>  >
>  > But it would be nice if there was a simpler way to do this.
>  >
>  > On 02/06/2008, Claude Brisson <claude@renegat.net> wrote:
>  > > You would typically check for the presence of a class that has been
>  > >  added since 1.5 - the typical getVersion() stuff hasn't been put yet in
>  > >  Velocity.
>  > >
>  > >
>  > >   Claude
>  > >
>  > >  Le vendredi 23 mai 2008 à 14:07 +0100, sebb a écrit :
>  > >
>  > > > How can one check the Velocity version from an Ant script?
>  > >  >
>  > >  > I had a problem with Anakia generating the wrong line endings on
>  > >  > Linux; turned out it was due to Ant picking up the wrong version of
>  > >  > the Velocity jar.
>  > >  >
>  > >  > It would be useful if one could check the version and report an error
>  > >  > if the version is earlier than  1.5 (say).
>  > >  >
>  > >
>  > > > ---------------------------------------------------------------------
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>  > >
>  >
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>  >
>  >
>
>
>  --
>
> Forio Business Simulations
>
>
>  Will Glass-Husain
>  wglass@forio.com
>  www.forio.com
>

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