mediaview: Skeleton for ARC Documents Provider FS.

chrome/browser/chromeos/arc/fileapi/arc_documents_provider_backend_delegate.cc

+// Copyright 2016 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 "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_backend_delegate.h"
+
+#include <memory>
+#include <utility>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "content/public/browser/browser_thread.h"
+#include "storage/browser/fileapi/file_stream_reader.h"
+#include "storage/browser/fileapi/file_stream_writer.h"
+#include "url/gurl.h"
+
+using content::BrowserThread;
+
+namespace arc {
+
+ArcDocumentsProviderBackendDelegate::ArcDocumentsProviderBackendDelegate()
+    : weak_ptr_factory_(this) {}
+
+ArcDocumentsProviderBackendDelegate::~ArcDocumentsProviderBackendDelegate() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+storage::AsyncFileUtil* ArcDocumentsProviderBackendDelegate::GetAsyncFileUtil(
+    storage::FileSystemType type) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  return &async_file_util_;
+}
+
+std::unique_ptr<storage::FileStreamReader>
+ArcDocumentsProviderBackendDelegate::CreateFileStreamReader(
+    const storage::FileSystemURL& url,
+    int64_t offset,
+    int64_t max_bytes_to_read,
+    const base::Time& expected_modification_time,
+    storage::FileSystemContext* context) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  NOTIMPLEMENTED();  // TODO(crbug.com/671511): Implement this function.
+  return nullptr;
+}
+
+std::unique_ptr<storage::FileStreamWriter>
+ArcDocumentsProviderBackendDelegate::CreateFileStreamWriter(
+    const storage::FileSystemURL& url,
+    int64_t offset,
+    storage::FileSystemContext* context) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  NOTREACHED();  // Read-only file system.
+  return nullptr;
+}
+
+storage::WatcherManager* ArcDocumentsProviderBackendDelegate::GetWatcherManager(
+    storage::FileSystemType type) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  NOTREACHED();  // Non-watchable file system.
+  return nullptr;
+}
+
+void ArcDocumentsProviderBackendDelegate::GetRedirectURLForContents(
+    const storage::FileSystemURL& url,
+    const storage::URLCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  NOTIMPLEMENTED();  // TODO(crbug.com/671511): Implement this function.
+  callback.Run(GURL());
+}
+
+}  // namespace arc