third_party/WebKit/Source/modules/webusb/NavigatorUSB.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/webusb/NavigatorUSB.h"

#include "core/frame/Navigator.h"
#include "modules/webusb/USB.h"

namespace blink {

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

USB* NavigatorUSB::usb(Navigator& navigator)
{
    return NavigatorUSB::from(navigator).usb();
}

USB* NavigatorUSB::usb()
{
    return m_usb;
}

DEFINE_TRACE(NavigatorUSB)
{
    visitor->trace(m_usb);
    Supplement<Navigator>::trace(visitor);
}

NavigatorUSB::NavigatorUSB(Navigator& navigator)
{
    if (navigator.frame())
        m_usb = USB::create(*navigator.frame());
}

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

} // namespace blink