Refactors DeviceOrientation to make it more extensible

content/browser/device_orientation/accelerometer_mac.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.
 
 #include "content/browser/device_orientation/accelerometer_mac.h"
 
 #include <math.h>
 
 #include "base/logging.h"
 #include "content/browser/device_orientation/orientation.h"
 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h"
 
 namespace device_orientation {
 
 // Create a AccelerometerMac object and return NULL if no valid sensor found.
 DataFetcher* AccelerometerMac::Create() {
   scoped_ptr<AccelerometerMac> accelerometer(new AccelerometerMac);
   return accelerometer->Init() ? accelerometer.release() : NULL;
 }
 
 AccelerometerMac::~AccelerometerMac() {
 }
 
 AccelerometerMac::AccelerometerMac() {
 }
 
+bool AccelerometerMac::GetDeviceData(DeviceData* device_data) {
+  switch (device_data->device_data_type()) {
+    case DeviceData::kDeviceOrientationData:
+      return GetOrientation(static_cast<Orientation*>(device_data));
+    default:
+      return false;
+  }
+}
+
 //  Retrieve per-axis orientation values.
 //
 //  Axes and angles are defined according to the W3C DeviceOrientation Draft.
 //  See here: http://dev.w3.org/geo/api/spec-source-orientation.html
 //
 //  Note: only beta and gamma angles are provided. Alpha is set to zero.
 //
 //  Returns false in case of error.
 //
 bool AccelerometerMac::GetOrientation(Orientation* orientation) {
@@ skipping 50 matching lines @@
 
   return true;
 }
 
 bool AccelerometerMac::Init() {
   sudden_motion_sensor_.reset(SuddenMotionSensor::Create());
   return sudden_motion_sensor_.get() != NULL;
 }
 
 }  // namespace device_orientation