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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "device/bluetooth/bluetooth_adapter_factory.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/bind.h"
     10 #include "base/lazy_instance.h"
     11 #include "base/memory/ref_counted.h"
     12 #include "base/memory/weak_ptr.h"
     13 #include "device/bluetooth/bluetooth_adapter.h"
     14 
     15 #if defined(OS_CHROMEOS)
     16 #include "device/bluetooth/bluetooth_adapter_chromeos.h"
     17 #elif defined(OS_WIN)
     18 #include "device/bluetooth/bluetooth_adapter_win.h"
     19 #elif defined(OS_MACOSX)
     20 #include "base/mac/mac_util.h"
     21 #include "device/bluetooth/bluetooth_adapter_mac.h"
     22 #endif
     23 
     24 namespace {
     25 
     26 using device::BluetoothAdapter;
     27 using device::BluetoothAdapterFactory;
     28 
     29 // Shared default adapter instance, we don't want to keep this class around
     30 // if nobody is using it so use a WeakPtr and create the object when needed;
     31 // since Google C++ Style (and clang's static analyzer) forbids us having
     32 // exit-time destructors we use a leaky lazy instance for it.
     33 base::LazyInstance<base::WeakPtr<device::BluetoothAdapter> >::Leaky
     34     default_adapter = LAZY_INSTANCE_INITIALIZER;
     35 
     36 typedef std::vector<BluetoothAdapterFactory::AdapterCallback>
     37     AdapterCallbackList;
     38 
     39 // List of adapter callbacks to be called once the adapter is initialized.
     40 // Since Google C++ Style (and clang's static analyzer) forbids us having
     41 // exit-time destructors we use a lazy instance for it.
     42 base::LazyInstance<AdapterCallbackList> adapter_callbacks =
     43     LAZY_INSTANCE_INITIALIZER;
     44 
     45 void RunAdapterCallbacks() {
     46   CHECK(default_adapter.Get().get());
     47   scoped_refptr<BluetoothAdapter> adapter(default_adapter.Get().get());
     48   for (std::vector<BluetoothAdapterFactory::AdapterCallback>::const_iterator
     49            iter = adapter_callbacks.Get().begin();
     50        iter != adapter_callbacks.Get().end();
     51        ++iter) {
     52     iter->Run(adapter);
     53   }
     54   adapter_callbacks.Get().clear();
     55 }
     56 
     57 }  // namespace
     58 
     59 namespace device {
     60 
     61 // static
     62 bool BluetoothAdapterFactory::IsBluetoothAdapterAvailable() {
     63 #if defined(OS_CHROMEOS)
     64   return true;
     65 #elif defined(OS_WIN)
     66   return true;
     67 #elif defined(OS_MACOSX)
     68   return base::mac::IsOSLionOrLater();
     69 #endif
     70   return false;
     71 }
     72 
     73 // static
     74 void BluetoothAdapterFactory::GetAdapter(const AdapterCallback& callback) {
     75   if (!default_adapter.Get().get()) {
     76 #if defined(OS_CHROMEOS)
     77     chromeos::BluetoothAdapterChromeOS* new_adapter =
     78         new chromeos::BluetoothAdapterChromeOS();
     79     default_adapter.Get() = new_adapter->weak_ptr_factory_.GetWeakPtr();
     80 #elif defined(OS_WIN)
     81     BluetoothAdapterWin* new_adapter = new BluetoothAdapterWin(
     82         base::Bind(&RunAdapterCallbacks));
     83     new_adapter->Init();
     84     default_adapter.Get() = new_adapter->weak_ptr_factory_.GetWeakPtr();
     85 #elif defined(OS_MACOSX)
     86     BluetoothAdapterMac* new_adapter = new BluetoothAdapterMac();
     87     new_adapter->Init();
     88     default_adapter.Get() = new_adapter->weak_ptr_factory_.GetWeakPtr();
     89 #endif
     90   }
     91 
     92   if (default_adapter.Get()->IsInitialized()) {
     93     callback.Run(scoped_refptr<BluetoothAdapter>(default_adapter.Get().get()));
     94   } else {
     95     adapter_callbacks.Get().push_back(callback);
     96   }
     97 }
     98 
     99 // static
    100 scoped_refptr<BluetoothAdapter> BluetoothAdapterFactory::MaybeGetAdapter() {
    101   return scoped_refptr<BluetoothAdapter>(default_adapter.Get().get());
    102 }
    103 
    104 }  // namespace device
    105