Joins the root path of the repository with the relative path returned
        by the artifact's getPath() method

def getArtifactPath(self, artifact, suffix=None, extension="jar"):
        """
        Joins the root path of the repository with the relative path returned
        by the artifact's getPath() method
        """
        return os.path.join(self._rootPath, artifact.getPath(suffix, extension, os.sep))