f = function(i)
            {
                if (i == descriptors.length)
                {
                    // all done

                    var form = $(self.fieldContainer).find('.alpaca-fileupload-input');
                    $(form).fileupload('option', 'done').call(form, $.Event('done'), {
                        result: {
                            files: files
                        }
                    });

                    callback();

                    return;
                }

                self.convertDescriptorToFile(descriptors[i], function(err, file) {
                    if (file)
                    {
                        files.push(file);
                    }
                    f(i+1);
                });
            }
@override

Sets an array of descriptors.

@param data