Refactoring bluetooth API code.

chrome/browser/chromeos/bluetooth/bluetooth_adapter_factory.cc

+// 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.
+//
+// TODO(youngki): Guard the ChromeOS specific part with "#ifdef CHROME_OS" block
+// once we move this code into common directory.
+
+#include "base/lazy_instance.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/chromeos/bluetooth/bluetooth_adapter_chromeos.h"
+#include "chrome/browser/chromeos/bluetooth/bluetooth_adapter_factory.h"
+
+namespace {
+
+// Shared default adapter instance, we don't want to keep this class around
+// if nobody is using it so use a WeakPtr and create the object when needed;
+// since Google C++ Style (and clang's static analyzer) forbids us having
+// exit-time destructors we use a leaky lazy instance for it.
+base::LazyInstance<base::WeakPtr<chromeos::BluetoothAdapter> >::Leaky
+    default_adapter = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+namespace chromeos {
+
+// static
+scoped_refptr<BluetoothAdapter> BluetoothAdapterFactory::DefaultAdapter() {
+  if (!default_adapter.Get().get()) {
+    BluetoothAdapterChromeOs* new_adapter = new BluetoothAdapterChromeOs;
+    new_adapter->TrackDefaultAdapter();
+    default_adapter.Get() = new_adapter->weak_ptr_factory_.GetWeakPtr();
+  }
+
+  return scoped_refptr<BluetoothAdapter>(default_adapter.Get());
+}
+
+// static
+BluetoothAdapter* BluetoothAdapterFactory::Create(const std::string& address) {
+  BluetoothAdapterChromeOs* adapter = new BluetoothAdapterChromeOs;
+  adapter->FindAdapter(address);
+  return adapter;
+}
+
+}  // namespace chromeos