/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "AbortSignal.h"

#include "mozilla/dom/Event.h"

#include "mozilla/dom/AbortSignalBinding.h"

namespace mozilla {

namespace dom {

// AbortSignalImpl

// ----------------------------------------------------------------------------

AbortSignalImpl::AbortSignalImpl(bool aAborted)

  : mAborted(aAborted)

{}

bool

AbortSignalImpl::Aborted() const

{

  return mAborted;

}

void

AbortSignalImpl::Abort()

{

  if (mAborted) {

    return;

  }

  mAborted = true;

  // Let's inform the followers.

  nsTObserverArray<AbortFollower*>::ForwardIterator iter(mFollowers);

  while (iter.HasMore()) {

    iter.GetNext()->Abort();

  }

}

void

AbortSignalImpl::AddFollower(AbortFollower* aFollower)

{

  MOZ_DIAGNOSTIC_ASSERT(aFollower);

  if (!mFollowers.Contains(aFollower)) {

    mFollowers.AppendElement(aFollower);

  }

}

void

AbortSignalImpl::RemoveFollower(AbortFollower* aFollower)

{

  MOZ_DIAGNOSTIC_ASSERT(aFollower);

  mFollowers.RemoveElement(aFollower);

}

// AbortSignal

// ----------------------------------------------------------------------------

NS_IMPL_CYCLE_COLLECTION_CLASS(AbortSignal)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(AbortSignal,

                                                  DOMEventTargetHelper)

  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFollowingSignal)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(AbortSignal,

                                                DOMEventTargetHelper)

  tmp->Unfollow();

NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(AbortSignal)

NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

NS_IMPL_ADDREF_INHERITED(AbortSignal, DOMEventTargetHelper)

NS_IMPL_RELEASE_INHERITED(AbortSignal, DOMEventTargetHelper)

AbortSignal::AbortSignal(nsIGlobalObject* aGlobalObject,

                         bool aAborted)

  : DOMEventTargetHelper(aGlobalObject)

  , AbortSignalImpl(aAborted)

{}

JSObject*

AbortSignal::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)

{

  return AbortSignal_Binding::Wrap(aCx, this, aGivenProto);

}

void

AbortSignal::Abort()

{

  AbortSignalImpl::Abort();

  EventInit init;

  init.mBubbles = false;

  init.mCancelable = false;

  RefPtr<Event> event =

    Event::Constructor(this, NS_LITERAL_STRING("abort"), init);

  event->SetTrusted(true);

  DispatchEvent(*event);

}

// AbortFollower

// ----------------------------------------------------------------------------

AbortFollower::~AbortFollower()

{

  Unfollow();

}

void

AbortFollower::Follow(AbortSignalImpl* aSignal)

{

  MOZ_DIAGNOSTIC_ASSERT(aSignal);

  Unfollow();

  mFollowingSignal = aSignal;

  aSignal->AddFollower(this);

}

void

AbortFollower::Unfollow()

{

  if (mFollowingSignal) {

    mFollowingSignal->RemoveFollower(this);

    mFollowingSignal = nullptr;

  }

}

bool

AbortFollower::IsFollowing() const

{

  return !!mFollowingSignal;

}

} // dom namespace

} // mozilla namespace