Bug 1295570 - Entries API - part 5 - Rename DirectoryReader to FileSystemDirectoryReader, r=smaug

dom/filesystem/compat/FileSystemRootDirectoryReader.cpp

@@ -0,0 +1,96 @@
+/* -*- 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"
+
+namespace mozilla {
+namespace dom {
+
+namespace {
+
+class EntriesCallbackRunnable final : public Runnable
+{
+public:
+  EntriesCallbackRunnable(EntriesCallback* aCallback,
+                          const Sequence<RefPtr<FileSystemEntry>>& aEntries)
+    : 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<EntriesCallback> 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_INHERITED(FileSystemRootDirectoryReader)
+NS_INTERFACE_MAP_END_INHERITING(FileSystemDirectoryReader)
+
+FileSystemRootDirectoryReader::FileSystemRootDirectoryReader(nsIGlobalObject* aGlobal,
+                                                             FileSystem* aFileSystem,
+                                                             const Sequence<RefPtr<FileSystemEntry>>& aEntries)
+  : FileSystemDirectoryReader(aGlobal, aFileSystem, nullptr)
+  , mEntries(aEntries)
+  , mAlreadyRead(false)
+{
+  MOZ_ASSERT(aGlobal);
+  MOZ_ASSERT(aFileSystem);
+}
+
+FileSystemRootDirectoryReader::~FileSystemRootDirectoryReader()
+{}
+
+void
+FileSystemRootDirectoryReader::ReadEntries(EntriesCallback& aSuccessCallback,
+                                           const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+                                           ErrorResult& aRv)
+{
+  if (mAlreadyRead) {
+    RefPtr<EmptyEntriesCallbackRunnable> runnable =
+      new EmptyEntriesCallbackRunnable(&aSuccessCallback);
+    aRv = NS_DispatchToMainThread(runnable);
+    NS_WARN_IF(aRv.Failed());
+    return;
+  }
+
+  // This object can be used only once.
+  mAlreadyRead = true;
+
+  RefPtr<EntriesCallbackRunnable> runnable =
+    new EntriesCallbackRunnable(&aSuccessCallback, mEntries);
+  aRv = NS_DispatchToMainThread(runnable);
+  NS_WARN_IF(aRv.Failed());
+}
+
+} // dom namespace
+} // mozilla namespace