Review

class CompilerOptions {
  /**
   * Creates a map of String->Node from a map of String->Number/String/Boolean.
   */
  private static Map<String, Node> getReplacementsHelper(
      Map<String, Object> source) {
    Map<String, Node> map = Maps.newHashMap();
    for (Map.Entry<String, Object> entry : source.entrySet()) {
      String name = entry.getKey();
      Object value = entry.getValue();
      if (value instanceof Boolean) {
        map.put(name, ((Boolean) value).booleanValue() ?
            new Node(Token.TRUE) : new Node(Token.FALSE));
      } else if (value instanceof Integer) {
        map.put(name, Node.newNumber(((Integer) value).intValue()));
      } else if (value instanceof Double) {
        map.put(name, Node.newNumber(((Double) value).doubleValue()));
      } else {
        Preconditions.checkState(value instanceof String);
        map.put(name, Node.newString((String) value));
      }
    }
    return map;
  }

}