Auto-numbering/ Auto-incrementing

[Hann-Yu Chang]

Has anyone implemented a means of versioning in ANT? I would like to auto-increment build numbers and use the generated build number in file and jar names.
I'm attemping to use a combination of the <property> and <propertyfile> tags and have created a separate properties file to keep track of the version numbers. Although not quite right yet, it does auto-increment. The problem now is getting that build number to populate
So that this:
Tools-${build}.jar
Results to:
Tools-1.2.jar
Any insight would be helpful. Thanks!