/* -*- 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 "FileSystemRootDirectoryReader.h"

#include "CallbackRunnables.h"

#include "nsIGlobalObject.h"

#include "mozilla/dom/FileSystemUtils.h"

namespace mozilla {

namespace dom {

namespace {

class EntriesCallbackRunnable final : public Runnable

{

public:

  EntriesCallbackRunnable(FileSystemEntriesCallback* aCallback,

                          const Sequence<RefPtr<FileSystemEntry>>& aEntries)

    : Runnable("EntriesCallbackRunnable")

    , mCallback(aCallback)

    , mEntries(aEntries)

  {

    MOZ_ASSERT(aCallback);

  }

  NS_IMETHOD

  Run() override

  {

    Sequence<OwningNonNull<FileSystemEntry>> entries;

    for (uint32_t i = 0; i < mEntries.Length(); ++i) {

      if (!entries.AppendElement(mEntries[i].forget(), fallible)) {

        return NS_ERROR_OUT_OF_MEMORY;

      }

    }

    mCallback->HandleEvent(entries);

    return NS_OK;

  }

private:

  RefPtr<FileSystemEntriesCallback> mCallback;

  Sequence<RefPtr<FileSystemEntry>> mEntries;

};

} // anonymous namespace

NS_IMPL_CYCLE_COLLECTION_INHERITED(FileSystemRootDirectoryReader,

                                   FileSystemDirectoryReader, mEntries)

NS_IMPL_ADDREF_INHERITED(FileSystemRootDirectoryReader,

                         FileSystemDirectoryReader)

NS_IMPL_RELEASE_INHERITED(FileSystemRootDirectoryReader,

                          FileSystemDirectoryReader)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystemRootDirectoryReader)

NS_INTERFACE_MAP_END_INHERITING(FileSystemDirectoryReader)

FileSystemRootDirectoryReader::FileSystemRootDirectoryReader(FileSystemDirectoryEntry* aParentEntry,

                                                             FileSystem* aFileSystem,

                                                             const Sequence<RefPtr<FileSystemEntry>>& aEntries)

  : FileSystemDirectoryReader(aParentEntry, aFileSystem, nullptr)

  , mEntries(aEntries)

  , mAlreadyRead(false)

{

  MOZ_ASSERT(aParentEntry);

  MOZ_ASSERT(aFileSystem);

}

FileSystemRootDirectoryReader::~FileSystemRootDirectoryReader()

{}

void

FileSystemRootDirectoryReader::ReadEntries(FileSystemEntriesCallback& aSuccessCallback,

                                           const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,

                                           ErrorResult& aRv)

{

  if (mAlreadyRead) {

    RefPtr<EmptyEntriesCallbackRunnable> runnable =

      new EmptyEntriesCallbackRunnable(&aSuccessCallback);

    aRv = FileSystemUtils::DispatchRunnable(GetParentObject(), runnable.forget());

    return;

  }

  // This object can be used only once.

  mAlreadyRead = true;

  RefPtr<EntriesCallbackRunnable> runnable =

    new EntriesCallbackRunnable(&aSuccessCallback, mEntries);

  aRv = FileSystemUtils::DispatchRunnable(GetParentObject(), runnable.forget());

}

} // dom namespace

} // mozilla namespace