bluetooth: Refactor code that checks if device/service/characteristic is in cache

content/browser/bluetooth/bluetooth_dispatcher_host.h

 // 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.
 
 #ifndef CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_DISPATCHER_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/id_map.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/bluetooth_chooser.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_gatt_connection.h"
 #include "device/bluetooth/bluetooth_gatt_service.h"
 
 namespace device {
 class BluetoothUUID;
 }
 
+namespace blink {
+enum class WebBluetoothError;
+}
+
 namespace content {
 
 struct BluetoothScanFilter;
 
 // Dispatches and sends bluetooth related messages sent to/from a child
 // process BluetoothDispatcher from/to the main browser process.
 //
 // Intended to be instantiated by the RenderProcessHost and installed as
 // a filter on the channel. BrowserMessageFilter is refcounted and typically
 // lives as long as it is installed on a channel.
@@ skipping 17 matching lines @@
 
  protected:
   ~BluetoothDispatcherHost() override;
 
  private:
   friend class base::DeleteHelper<BluetoothDispatcherHost>;
   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
 
   struct RequestDeviceSession;
 
+  enum class CacheQueryOutcome {
+    SUCCESS = 0,
+    BAD_RENDERER = 1,
+    NO_DEVICE = 2,
+    NO_SERVICE = 3,
+    NO_CHARACTERISTIC = 4
+  };
+
+  blink::WebBluetoothError CacheQueryOutcomeToWebBluetoothError(
+      CacheQueryOutcome outcome);
+  std::pair<CacheQueryOutcome, device::BluetoothDevice*> QueryForDevice(
+      const std::string& device_instance_id);
+  std::pair<CacheQueryOutcome, device::BluetoothGattService*> QueryForService(
+      const std::string& service_instance_id);
+  std::pair<CacheQueryOutcome, device::BluetoothGattCharacteristic*>
+  QueryForCharacteristic(const std::string& characteristic_instance_id);
+
   // Set |adapter_| to a BluetoothAdapter instance and register observers,
   // releasing references to previous |adapter_|.
   void set_adapter(scoped_refptr<device::BluetoothAdapter> adapter);
 
   // Stops all BluetoothDiscoverySessions being run for requestDevice()
   // choosers.
   void StopDeviceDiscovery();
 
   // BluetoothAdapter::Observer:
   void AdapterPoweredChanged(device::BluetoothAdapter* adapter,
@@ skipping 117 matching lines @@
 
   // Must be last member, see base/memory/weak_ptr.h documentation
   base::WeakPtrFactory<BluetoothDispatcherHost> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_DISPATCHER_HOST_H_