given a file filter , expose as a filenamefilter . concode_field_sep PlaceHolder placeHolder concode_field_sep List<T> filter concode_elem_sep Filter<String> buildRegexFilterExcludeOverInclude concode_elem_sep Filter<String> buildRegexFilterIncludeOverExclude concode_elem_sep Filter<File> getDirectoryFilter concode_elem_sep Filter<File> getFileExtensionFilter concode_elem_sep Filter<T> fromStringFilter concode_elem_sep Filter<File> getFileExtensionOrDirectoryFilter concode_elem_sep Filter<File> toNormalizedFileFilter concode_elem_sep Filter<File> toFileFilter