Isolated FS for media devices.

webkit/fileapi/media/media_device_map_service.cc

Index: webkit/fileapi/media/media_device_map_service.cc
diff --git a/webkit/fileapi/media/media_device_map_service.cc b/webkit/fileapi/media/media_device_map_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2aab49353c82587b9cbbb42f8f85030db53caad6
--- /dev/null
+++ b/webkit/fileapi/media/media_device_map_service.cc
@@ -0,0 +1,59 @@
+// Copyright (c) 2012 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 "webkit/fileapi/media/media_device_map_service.h"
+
+#include <utility>
+
+#include "webkit/fileapi/isolated_context.h"
+
+namespace fileapi {
+
+using base::SequencedTaskRunner;
+
+// static
+MediaDeviceMapService* MediaDeviceMapService::GetInstance() {
+  return Singleton<MediaDeviceMapService>::get();
+}
+
+MediaDeviceInterfaceImpl* MediaDeviceMapService::CreateOrGetMediaDevice(
+    const std::string& filesystem_id,
+    SequencedTaskRunner* media_task_runner) {
+  DCHECK(media_task_runner);
+
+  base::AutoLock lock(media_device_map_lock_);
+
+  FilePath device_path;
+  if (!IsolatedContext::GetInstance()->GetRegisteredPath(filesystem_id,
+                                                         &device_path)) {
+    return NULL;
+  }
+
+  FilePath::StringType device_location = device_path.value();
+  DCHECK(!device_location.empty());
+
+  MediaDeviceMap::const_iterator it = media_device_map_.find(device_location);
+  if (it == media_device_map_.end()) {
+    media_device_map_.insert(std::make_pair(
+        device_location, new MediaDeviceInterfaceImpl(device_location,
+                                                      media_task_runner)));
+  }
+  return media_device_map_[device_location].get();
+}
+
+void MediaDeviceMapService::RemoveMediaDevice(
+    const std::string& device_location) {
+  base::AutoLock lock(media_device_map_lock_);
+  MediaDeviceMap::iterator it = media_device_map_.find(device_location);
+  if (it != media_device_map_.end())
+    media_device_map_.erase(it);
+}
+
+MediaDeviceMapService::MediaDeviceMapService() {
+}
+
+MediaDeviceMapService::~MediaDeviceMapService() {
+}
+
+}  // namespace fileapi