How to get package name for a directory?

[Ann Bernstein]

Hi,
I have a very large projectd with 300 packages and 1000s of source files. In each package, we created a build.xml file for that package.
We also have a master build.xml file under our <workspace>/build directory which has targets to rebuild all the packages by invoking the "compile" target on all 200 build.xml files.

Everything works, but I am trying to see if there is a way to simplify the build.xml files in each directory, so that it is even easier to add a new build.xml for a new package.

Here is an example build.xml that is in each package directory.

<project name="api/abc" default="compile" basedir=".">
    <property name="TOP" value="../../.."/>
 
    <!-- compile all subdirectories -->
    <target name="compile">
        <echo>package: ${ant.project.name}</echo>
        <property name="compile.dir" value="${basedir}"/>
        <ant dir="${TOP}/build" target="compile" inheritAll="true"/>
    </target>
</project>

I am trying to find some way to make the assignement of project name and the TOP variable automatic. I want to do something like.

<project name="${ant.package.name}" basedir=".">
       <property name="TOP" value="../${ant.package.path}"/>
...
</project>

For the package api.abc, I would need
${ant.package.name} = api.abc
${ant.package.path} = api/abc

Is there anyway for me to construct this information based on the basedir, or would this require a custom task?

I would think this would be a commmon request, but I can't find any builtin tasks or predefined variables which would help me find out the java package name or base path for the package.
I found BaseName and DirName but these are very limited.