third_party/WebKit/Source/modules/mediastream/MediaDevicesRequest.cpp

/*
 * Copyright (C) 2014 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GOOGLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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#include "modules/mediastream/MediaDevicesRequest.h"

#include "bindings/core/v8/ScriptPromiseResolver.h"
#include "bindings/core/v8/ScriptState.h"
#include "core/dom/DOMException.h"
#include "core/dom/Document.h"
#include "modules/mediastream/UserMediaController.h"

namespace blink {

MediaDevicesRequest* MediaDevicesRequest::create(
    ScriptState* state,
    UserMediaController* controller) {
  MediaDevicesRequest* request = new MediaDevicesRequest(state, controller);
  request->suspendIfNeeded();
  return request;
}

MediaDevicesRequest::MediaDevicesRequest(ScriptState* state,
                                         UserMediaController* controller)
    : ActiveDOMObject(state->getExecutionContext()),
      m_controller(controller),
      m_resolver(ScriptPromiseResolver::create(state)) {}

MediaDevicesRequest::~MediaDevicesRequest() {}

Document* MediaDevicesRequest::ownerDocument() {
  if (ExecutionContext* context = getExecutionContext()) {
    return toDocument(context);
  }

  return 0;
}

ScriptPromise MediaDevicesRequest::start() {
  DCHECK(m_controller);
  m_resolver->keepAliveWhilePending();
  m_controller->requestMediaDevices(this);
  return m_resolver->promise();
}

void MediaDevicesRequest::succeed(const MediaDeviceInfoVector& mediaDevices) {
  if (!getExecutionContext() || !m_resolver)
    return;

  m_resolver->resolve(mediaDevices);
}

void MediaDevicesRequest::contextDestroyed() {
  m_controller.clear();
  m_resolver.clear();
}

DEFINE_TRACE(MediaDevicesRequest) {
  visitor->trace(m_controller);
  visitor->trace(m_resolver);
  ActiveDOMObject::trace(visitor);
}

}  // namespace blink