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Date: Tue, 26 Aug 2008 11:29:34 -0700 (PDT)
From: David W <davidw589@yahoo.com>
Reply-To: davidw589@yahoo.com
Subject: Re: Search a folder automatically?
To: Ant Users List <user@ant.apache.org>, David Weintraub <qazwart@gmail.com>
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Hi David,=20
=A0
Thanks so much for your reply. I use apache-ant-1.7.1 on Linux. I found tha=
t my old Java source code still got compiled and run even though I left the=
 old corresponding compiled class file there.=20
=A0
What I wanted Ant to do is to=A0check a folder continuously (or check the f=
older once every 3 or 5 minutes) to see if a new source code comes. If it i=
s, then it goes to do more work. Otherwise it just either continue to searc=
h or go to sleep again. Is this possible?=20
=A0
Thanks again,=20
=A0
David W.
=A0
=A0
=A0


--- On Tue, 8/26/08, David Weintraub <qazwart@gmail.com> wrote:

From: David Weintraub <qazwart@gmail.com>
Subject: Re: Search a folder automatically?
To: "Ant Users List" <user@ant.apache.org>, davidw589@yahoo.com
Date: Tuesday, August 26, 2008, 10:03 AM

Take a look at "filesets". Also, in the <javac> task, you can
specify
a "src" directory. All *.java files in that directory will get
compiled.

If someone creates a new *.java file in the "src" directory, and did
not delete the corresponding *.class files, then the <javac> task will
only compile that new *.java file. If you change the source code in
one *.java file, the <javac> task will only compile that one file and
leave the others alone (as long as you didn't delete the corresponding
*.class files).

Almost all Ant tasks use timestamps to check whether or not it needs
to do a particular task. For example, <copy> won't copy files if the
files in the destination directory have a newer timestamp than the
files in the source directory. <jar> won't rejar files if the
timestamp of the jarfile is newer than all the source files that you
specified are in that jarfile.

Take a look at the <javac> tasks below:

<javac
    src=3D"${source.dir}"
    dest=3D"${dest.dir}"
    classpath=3D"${classpath}"/>

<javac dest=3D"${dest.dir}">
    <src>
        <fileset dir=3D"${source.dir}"/>
    </src>
    <classpath>
         <fileset dir=3D"${class.dir}"/>
    </classpath>
</javac>

First of all, I always specify a "dest" directory. That way, I can
easily create a clean target which simply deletes the ${dest.dir}.

The first one uses a single "src" directory (which isn't
uncommon).
The second form allows me to specify multiple source directories, and
allows me to just put all the files needed for compiling into a single
${class.dir}. To change the classpath, all I have to do is change the
files in the ${class.dir}.

I hope this answers your question.

--
David Weintraub
qazwart@gmail.com



On Tue, Aug 26, 2008 at 11:30 AM, David W <davidw589@yahoo.com> wrote:
> Hi,
>
> I am a newbie in Ant field so I appreciate any replies from you.
>
> What I want to do is to let Ant search a folder automatically. If a piece
of source code (say, Java source code) is put into that folder, then Ant fi=
nds
the code and begin to do more work. Can anybody tell me how to make Ant to
search a folder automatically?
>
> Thanks so much!
>
> David
>
>
>
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