Method FileInputSupplier

enums/VendingMachine.java:132–143

(String fileName)

class FileInputSupplier implements Supplier<Input> {
  private Iterator<String> input;
  FileInputSupplier(String fileName) {
    try {
      input = Files.lines(Paths.get(fileName))
        .skip(1) // Skip the comment line
        .flatMap(s -> Arrays.stream(s.split(";")))
        .map(String::trim)
        .collect(Collectors.toList())
        .iterator();
    } catch(IOException e) {
      throw new RuntimeException(e);
    }
  }
  @Override public Input get() {
    if(!input.hasNext())
      return null;