[fsp] Refactor handling operations.

chrome/browser/chromeos/file_system_provider/operations/operation.cc

+// Copyright 2014 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/file_system_provider/operations/operation.h"
+
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
+#include "extensions/browser/event_router.h"
+
+namespace chromeos {
+namespace file_system_provider {
+namespace operations {
+namespace {
+
+// Default implementation for dispatching an event. Can be replaced for unit
+// tests by Operation::SetDispatchEventImplForTest().
+bool DispatchEventImpl(extensions::EventRouter* event_router,
+                       const std::string& extension_id,
+                       scoped_ptr<extensions::Event> event) {
+  if (!event_router->ExtensionHasEventListener(extension_id, event->event_name))
+    return false;
+
+  event_router->DispatchEventToExtension(extension_id, event.Pass());
+  return true;
+}
+
+}  // namespace
+
+Operation::Operation(extensions::EventRouter* event_router,
+                     const ProvidedFileSystemInfo& file_system_info)
+    : file_system_info_(file_system_info),
+      dispatch_event_impl_(base::Bind(&DispatchEventImpl,
+                                      event_router,
+                                      file_system_info_.extension_id())) {
+}
+
+Operation::~Operation() {
+}
+
+void Operation::SetDispatchEventImplForTesting(
+    const DispatchEventImplCallback& callback) {
+  dispatch_event_impl_ = callback;
+}
+
+bool Operation::SendEvent(int request_id,
+                          const std::string& event_name,
+                          scoped_ptr<base::ListValue> event_args) {
+  event_args->Insert(
+      0, new base::FundamentalValue(file_system_info_.file_system_id()));
+  event_args->Insert(1, new base::FundamentalValue(request_id));
+
+  return dispatch_event_impl_.Run(
+      make_scoped_ptr(new extensions::Event(event_name, event_args.Pass())));
+}
+
+}  // namespace operations
+}  // namespace file_system_provider
+}  // namespace chromeos