third_party/WebKit/Source/modules/nfc/NavigatorNFC.cpp

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "modules/nfc/NavigatorNFC.h"

#include "core/frame/Navigator.h"
#include "modules/nfc/NFC.h"

namespace blink {

NavigatorNFC::NavigatorNFC() {}

const char* NavigatorNFC::supplementName() {
  return "NavigatorNFC";
}

NavigatorNFC& NavigatorNFC::from(Navigator& navigator) {
  NavigatorNFC* supplement = static_cast<NavigatorNFC*>(
      Supplement<Navigator>::from(navigator, supplementName()));
  if (!supplement) {
    supplement = new NavigatorNFC();
    provideTo(navigator, supplementName(), supplement);
  }
  return *supplement;
}

NFC* NavigatorNFC::nfc(Navigator& navigator) {
  NavigatorNFC& self = NavigatorNFC::from(navigator);
  if (!self.m_nfc) {
    if (!navigator.frame())
      return nullptr;
    self.m_nfc = NFC::create(navigator.frame());
  }
  return self.m_nfc.get();
}

DEFINE_TRACE(NavigatorNFC) {
  visitor->trace(m_nfc);
  Supplement<Navigator>::trace(visitor);
}

}  // namespace blink