[sensors] Accelerometer sensor bindings implementation

third_party/WebKit/Source/modules/sensor/AccelerometerReading.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/AccelerometerReading.h"
+
+#include "modules/sensor/SensorProxy.h"
+
+namespace blink {
+
+AccelerometerReading::AccelerometerReading(const AccelerometerReadingInit& init)
+    : SensorReading(nullptr), mAccelerometerReadingInit(init) {}
+
+AccelerometerReading::AccelerometerReading(SensorProxy* proxy)
+    : SensorReading(proxy),
+      mAccelerometerReadingInit(AccelerometerReadingInit()) {}
+
+AccelerometerReading::~AccelerometerReading() = default;
+
+double AccelerometerReading::x() const {
+  if (mAccelerometerReadingInit.hasX())
+    return mAccelerometerReadingInit.hasX();
+
+  if (!m_sensorProxy)
+    return 0.0;
+  return m_sensorProxy->reading().values[0];
+}
+
+double AccelerometerReading::y() const {
+  if (mAccelerometerReadingInit.hasY())
+    return mAccelerometerReadingInit.hasY();
+
+  if (!m_sensorProxy)
+    return 0.0;
+  return m_sensorProxy->reading().values[1];
+}
+
+double AccelerometerReading::z() const {
+  if (mAccelerometerReadingInit.hasZ())
+    return mAccelerometerReadingInit.hasZ();
+
+  if (!m_sensorProxy)
+    return 0.0;
+  return m_sensorProxy->reading().values[2];
+}
+
+bool AccelerometerReading::isReadingUpdated(
+    const SensorProxy::Reading& previous) const {
+  if (!m_sensorProxy)
+    return false;
+  return (previous.values[0] != x() || previous.values[1] != y() ||
+          previous.values[2] != z());
+}
+
+DEFINE_TRACE(AccelerometerReading) {
+  SensorReading::trace(visitor);
+}
+
+}  // namespace blink