Hi,

I'm writing a Maven plugin that merges CSS files together. So all the CSS files that match /foo/bar/*.css might get merged to /foo/merged.css.

A concern is that in a file such as /foo/bar/baz.css there might be a property such as:

background: url("images/pic.jpg")

So when the file is merged into /foo/merged.css this will need to be changed to

background: url("bar/images/pic.jpg")

The recalculated URL obviously depends on 3 factors:

• original URL
• original CSS file location
• merged CSS file location

Assuming that the original and merged CSS files are both on the same filesystem, is there a general formula (or Java library) that can be used to calculate the new url given these 3 inputs?

Thanks, Don