Cleaner organization of WifiDataProvider code.

content/browser/geolocation/wifi_data_provider.cc

 // Copyright 2013 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 "content/browser/geolocation/wifi_data_provider.h"
 
 namespace content {
 
-// static
-WifiDataProvider* WifiDataProvider::instance_ = NULL;
-
-// static
-WifiDataProvider::ImplFactoryFunction WifiDataProvider::factory_function_ =
-    DefaultFactoryFunction;
-
-// static
-void WifiDataProvider::SetFactory(ImplFactoryFunction factory_function_in) {
-  factory_function_ = factory_function_in;
-}
-
-// static
-void WifiDataProvider::ResetFactory() {
-  factory_function_ = DefaultFactoryFunction;
-}
-
-// static
-WifiDataProvider* WifiDataProvider::Register(WifiDataUpdateCallback* callback) {
-  bool need_to_start_data_provider = false;
-  if (!instance_) {
-    instance_ = new WifiDataProvider();
-    need_to_start_data_provider = true;
-  }
-  DCHECK(instance_);
-  instance_->AddCallback(callback);
-  // Start the provider after adding the callback, to avoid any race in
-  // it running early.
-  if (need_to_start_data_provider)
-    instance_->StartDataProvider();
-  return instance_;
-}
-
-// static
-bool WifiDataProvider::Unregister(WifiDataUpdateCallback* callback) {
-  DCHECK(instance_);
-  DCHECK(instance_->has_callbacks());
-  if (!instance_->RemoveCallback(callback)) {
-    return false;
-  }
-  if (!instance_->has_callbacks()) {
-    // Must stop the data provider (and any implementation threads) before
-    // destroying to avoid any race conditions in access to the provider in
-    // the destructor chain.
-    instance_->StopDataProvider();
-    delete instance_;
-    instance_ = NULL;
-  }
-  return true;
-}
-
-WifiDataProviderImplBase::WifiDataProviderImplBase()
-    : container_(NULL),
-      client_loop_(base::MessageLoop::current()) {
+WifiDataProvider::WifiDataProvider()
+    : container_(NULL), client_loop_(base::MessageLoop::current()) {
   DCHECK(client_loop_);
 }
 
-WifiDataProviderImplBase::~WifiDataProviderImplBase() {
+WifiDataProvider::~WifiDataProvider() {
 }
 
-void WifiDataProviderImplBase::SetContainer(WifiDataProvider* container) {
+void WifiDataProvider::SetContainer(WifiDataProviderManager* container) {
   container_ = container;
 }
 
-void WifiDataProviderImplBase::AddCallback(WifiDataUpdateCallback* callback) {
+void WifiDataProvider::AddCallback(WifiDataUpdateCallback* callback) {
   callbacks_.insert(callback);
 }
 
-bool WifiDataProviderImplBase::RemoveCallback(
-    WifiDataUpdateCallback* callback) {
+bool WifiDataProvider::RemoveCallback(WifiDataUpdateCallback* callback) {
   return callbacks_.erase(callback) == 1;
 }
 
-bool WifiDataProviderImplBase::has_callbacks() const {
+bool WifiDataProvider::has_callbacks() const {
   return !callbacks_.empty();
 }
 
-void WifiDataProviderImplBase::RunCallbacks() {
-  client_loop_->PostTask(FROM_HERE, base::Bind(
-      &WifiDataProviderImplBase::DoRunCallbacks,
-      this));
+void WifiDataProvider::RunCallbacks() {
+  client_loop_->PostTask(FROM_HERE,
+                         base::Bind(&WifiDataProvider::DoRunCallbacks, this));
 }
 
-bool WifiDataProviderImplBase::CalledOnClientThread() const {
+bool WifiDataProvider::CalledOnClientThread() const {
   return base::MessageLoop::current() == this->client_loop_;
 }
 
-base::MessageLoop* WifiDataProviderImplBase::client_loop() const {
+base::MessageLoop* WifiDataProvider::client_loop() const {
   return client_loop_;
 }
 
-void WifiDataProviderImplBase::DoRunCallbacks() {
+void WifiDataProvider::DoRunCallbacks() {
   // It's possible that all the callbacks (and the container) went away
   // whilst this task was pending. This is fine; the loop will be a no-op.
   CallbackSet::const_iterator iter = callbacks_.begin();
   while (iter != callbacks_.end()) {
     WifiDataUpdateCallback* callback = *iter;
     ++iter;  // Advance iter before running, in case callback unregisters.
     callback->Run(container_);
   }
 }
 
-WifiDataProvider::WifiDataProvider() {
-  DCHECK(factory_function_);
-  impl_ = (*factory_function_)();
-  DCHECK(impl_.get());
-  impl_->SetContainer(this);
-}
-
-WifiDataProvider::~WifiDataProvider() {
-  DCHECK(impl_.get());
-  impl_->SetContainer(NULL);
-}
-
-bool WifiDataProvider::GetData(WifiData* data) {
-  return impl_->GetData(data);
-}
-
-void WifiDataProvider::AddCallback(WifiDataUpdateCallback* callback) {
-  impl_->AddCallback(callback);
-}
-
-bool WifiDataProvider::RemoveCallback(WifiDataUpdateCallback* callback) {
-  return impl_->RemoveCallback(callback);
-}
-
-bool WifiDataProvider::has_callbacks() const {
-  return impl_->has_callbacks();
-}
-
-void WifiDataProvider::StartDataProvider() {
-  impl_->StartDataProvider();
-}
-
-void WifiDataProvider::StopDataProvider() {
-  impl_->StopDataProvider();
-}
-
 }  // namespace content