Method valueOf

java/dagger/internal/codegen/CompilerOptions.java:213–238

(
      ProcessingEnvironment processingEnv, String key, T defaultValue, Set<T> validValues)

  }

  private static <T extends Enum<T>> T valueOf(
      ProcessingEnvironment processingEnv, String key, T defaultValue, Set<T> validValues) {
    Map<String, String> options = processingEnv.getOptions();
    if (options.containsKey(key)) {
      try {
        T type =
            Enum.valueOf(defaultValue.getDeclaringClass(), Ascii.toUpperCase(options.get(key)));
        if (!validValues.contains(type)) {
          throw new IllegalArgumentException(); // let handler below print out good msg.
        }
        return type;
      } catch (IllegalArgumentException e) {
        processingEnv
            .getMessager()
            .printMessage(
                Diagnostic.Kind.ERROR,
                "Processor option -A"
                    + key
                    + " may only have the values "
                    + validValues
                    + " (case insensitive), found: "
                    + options.get(key));
      }
    }
    return defaultValue;
  }
}