static boolean printHelpUsageAndExitIfNeeded()

in sdk/src/main/java/com/google/cloud/dataflow/sdk/options/PipelineOptionsFactory.java [315:369]
50 lines of code
10 McCabe index (conditional complexity)

  static boolean printHelpUsageAndExitIfNeeded(ListMultimap<String, String> options,
      PrintStream printStream, boolean exit) {
    if (options.containsKey("help")) {
      final String helpOption = Iterables.getOnlyElement(options.get("help"));

      // Print the generic help if only --help was specified.
      if (Boolean.TRUE.toString().equals(helpOption)) {
        printHelp(printStream);
        if (exit) {
          System.exit(0);
        } else {
          return true;
        }
      }

      // Otherwise attempt to print the specific help option.
      try {
        Class<?> klass = Class.forName(helpOption);
        if (!PipelineOptions.class.isAssignableFrom(klass)) {
          throw new ClassNotFoundException("PipelineOptions of type " + klass + " not found.");
        }
        printHelp(printStream, (Class<? extends PipelineOptions>) klass);
      } catch (ClassNotFoundException e) {
        // If we didn't find an exact match, look for any that match the class name.
        Iterable<Class<? extends PipelineOptions>> matches = Iterables.filter(
            getRegisteredOptions(),
            new Predicate<Class<? extends PipelineOptions>>() {
              @Override
              public boolean apply(Class<? extends PipelineOptions> input) {
                if (helpOption.contains(".")) {
                  return input.getName().endsWith(helpOption);
                } else {
                  return input.getSimpleName().equals(helpOption);
                }
              }
          });
        try {
          printHelp(printStream, Iterables.getOnlyElement(matches));
        } catch (NoSuchElementException exception) {
          printStream.format("Unable to find option %s.%n", helpOption);
          printHelp(printStream);
        } catch (IllegalArgumentException exception) {
          printStream.format("Multiple matches found for %s: %s.%n", helpOption,
              Iterables.transform(matches, ReflectHelpers.CLASS_NAME));
          printHelp(printStream);
        }
      }
      if (exit) {
        System.exit(0);
      } else {
        return true;
      }
    }
    return false;
  }