third_party/WebKit/Source/modules/battery/NavigatorBattery.cpp

// Copyright 2014 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/battery/NavigatorBattery.h"

#include "core/frame/LocalFrame.h"
#include "modules/battery/BatteryManager.h"

namespace blink {

NavigatorBattery::NavigatorBattery() {}

ScriptPromise NavigatorBattery::getBattery(ScriptState* scriptState,
                                           Navigator& navigator) {
  return NavigatorBattery::from(navigator).getBattery(scriptState);
}

ScriptPromise NavigatorBattery::getBattery(ScriptState* scriptState) {
  if (!m_batteryManager)
    m_batteryManager =
        BatteryManager::create(scriptState->getExecutionContext());

  return m_batteryManager->startRequest(scriptState);
}

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

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

DEFINE_TRACE(NavigatorBattery) {
  visitor->trace(m_batteryManager);
  Supplement<Navigator>::trace(visitor);
}

}  // namespace blink