Method hasNext

java/src/org/openqa/selenium/json/JsonInput.java:353–384

Determine whether an element is pending for the current container from the JSON input stream. @return true if an element is pending; otherwise false @throws JsonException if no container is open @throws UncheckedIOException if an I/O exception is encountered

()

   * @throws UncheckedIOException if an I/O exception is encountered
   */
  public boolean hasNext() {
    if (stack.isEmpty()) {
      throw new JsonException(
          "Unable to determine if an item has next when not in a container type. " + input);
    }

    skipWhitespace(input);
    boolean seenElement = Boolean.TRUE.equals(containerHasElement.peekFirst());

    if (input.peek() == ',') {
      if (!seenElement) {
        throw new JsonException("Unexpected ',' before first element of container. " + input);
      }
      input.read();
      // We've moved past the separator, so we're once again expecting an element rather than
      // another comma. Clear the flag so a repeat hasNext() before reading is a no-op.
      clearSeenElement();
      skipWhitespace(input);
      JsonType afterComma = peek();
      // Trailing comma leniency: '[1,]' and '{"a":1,}' are accepted.
      return afterComma != JsonType.END_COLLECTION && afterComma != JsonType.END_MAP;
    }

    JsonType type = peek();
    if (type == JsonType.END_COLLECTION || type == JsonType.END_MAP) {
      return false;
    }
    if (seenElement) {
      throw new JsonException("Expected ',' or end of container but saw " + type + ". " + input);
    }
    return true;
  }

  /**
   * Process the opening square bracket of a JSON array.