WIP : Generic Sensor API implementation

third_party/WebKit/Source/modules/sensor/PressureSensorReading.cpp

+// Copyright 2016 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 "modules/sensor/PressureSensorReading.h"
+
+namespace blink {
+
+PressureSensorReading::PressureSensorReading(SensorController* controller)
+    : SensorReading(controller)
+{
+}
+
+DEFINE_TRACE(PressureSensorReading)
+{
+    SensorReading::trace(visitor);
+}
+
+DOMHighResTimeStamp PressureSensorReading::timeStamp() const
+{
+    refreshData();
+    return m_data.timestamp;
+}
+
+double PressureSensorReading::pressure() const
+{
+    refreshData();
+    return m_data.pressure;
+}
+
+auto PressureSensorReading::updateInternalData() -> UpdateStatus
+{
+    if (!m_controller || !m_controller->isInitialized())
+        return Error;
+
+    double previous = m_data.pressure;
+
+    refreshData();
+
+//    WTFLogAlways("PressureSensorReading::updateInternalData: %f, time: %f", m_data.pressure, m_data.timestamp);
+
+    return (previous != m_data.pressure) ? Updated : Same;
+}
+
+void PressureSensorReading::refreshData() const
+{
+    if (!m_controller || !m_controller->isInitialized())
+        return;
+    m_data = *m_controller->reading<Data>();
+}
+
+} // namespace blink