how to use fileset in ant macrodef - ant

Question

I would like to use the fileset in below macrodef.
I wish to change attribute jar to dir so that all jar files in dir can be processed.
<macrodef name="unjartemp">
<attribute name="jar" />
<sequential>
<!-- Remove any existing signatures from a JAR file. -->
<tempfile prefix="unjar-"
destdir="${java.io.tmpdir}" property="temp.file" />
<echo message="Removing signatures from JAR: #{jar}" />
<mkdir dir="${temp.file}" />
<unjar src="#{jar}" dest="${temp.file}" />
<delete file="#{jar}" failonerror="true" />
</sequential>
</macrodef>

Answer 1

To keep it flexible you may use macrodef with nested element attribute for 1-n filesets, f.e.
a macrodef that creates a dirlisting in xmlformat for nested filesets :
<macrodef name="dir2xml">
<attribute name="file"
description="xmlfile for filelisting"/>
<attribute name="roottag"
description="xml root tag"/>
<attribute name="entrytag"
description="xml tag for entry"/>
<element name="fs"
description="nested filesets for listing"/>
<sequential>
<pathconvert
property="files.xml"
dirsep="/"
pathsep="</#{entrytag}>${line.separator} <#{entrytag}>"
>
<!-- 1-n nested fileset(s) -->
<fs/>
</pathconvert>
<!-- create xmlfile -->
<echo message="<#{roottag}>${line.separator} <#{entrytag}>${files.xml}</#{entrytag}>${line.separator}</#{roottag}>" file="#{file}"/>
</sequential>
</macrodef>
Usage :
<dir2xml file="filelistant.xml" entrytag="antfile" roottag="antfilelist">
<fs>
<fileset dir="." includes="**/*.xml"/>
<fileset dir="../ant_xml" includes="**/*.xml"/>
</fs>
</dir2xml>

Answer 2

Add your fileset:
<fileset dir="${jars.dir}" id="jars_to_unjar">
<include name="**/*.jar"/>
</fileset>
call you macros:
<unjartemp filesetref="jars_to_unjar"/>
And you can try this modified macros:
<macrodef name="unjartemp">
<attribute name="filesetref" />
<sequential>
<for param="file">
<fileset refid="#{filesetref}"/>
<sequential>
<!-- Remove any existing signatures from a JAR file. -->
<tempfile prefix="unjar-"
destdir="${java.io.tmpdir}" property="temp.file" />
<echo message="Removing signatures from JAR: #{file}" />
<mkdir dir="${temp.file}" />
<unjar src="#{file}" dest="${temp.file}" />
<delete file="#{file}" failonerror="true" />
</sequential>
</for>
</sequential>
</macrodef>