mediaview: Implement ArcDocumentsProviderWatcherManager.

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

+// Copyright 2017 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_watcher_manager.h"
+
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_root.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_root_map.h"
+#include "content/public/browser/browser_thread.h"
+#include "storage/browser/fileapi/file_system_url.h"
+
+using content::BrowserThread;
+using storage::FileSystemURL;
+
+namespace arc {
+
+ArcDocumentsProviderWatcherManager::ArcDocumentsProviderWatcherManager(
+    ArcDocumentsProviderRootMap* roots)
+    : roots_(roots), weak_ptr_factory_(this) {}
+
+ArcDocumentsProviderWatcherManager::~ArcDocumentsProviderWatcherManager() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+void ArcDocumentsProviderWatcherManager::AddWatcher(
+    const FileSystemURL& url,
+    bool recursive,
+    const StatusCallback& callback,
+    const NotificationCallback& notification_callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  if (recursive) {
+    // Recursive watching is not supported.
+    callback.Run(base::File::FILE_ERROR_INVALID_OPERATION);
+    return;
+  }
+
+  base::FilePath path;
+  ArcDocumentsProviderRoot* root = roots_->ParseAndLookup(url, &path);
+  if (!root) {
+    callback.Run(base::File::FILE_ERROR_NOT_FOUND);
+    return;
+  }
+
+  root->AddWatcher(path, notification_callback, callback);
+}
+
+void ArcDocumentsProviderWatcherManager::RemoveWatcher(
+    const FileSystemURL& url,
+    bool recursive,
+    const StatusCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  if (recursive) {
+    // Recursive watching is not supported.
+    callback.Run(base::File::FILE_ERROR_INVALID_OPERATION);
+    return;
+  }
+
+  base::FilePath path;
+  ArcDocumentsProviderRoot* root = roots_->ParseAndLookup(url, &path);
+  if (!root) {
+    callback.Run(base::File::FILE_ERROR_NOT_FOUND);
+    return;
+  }
+
+  root->RemoveWatcher(path, callback);
+}
+
+}  // namespace arc