Generic Sensor API : Ambient Light Sensor API.

third_party/WebKit/Source/modules/sensor/NavigatorAmbientLightSensor.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/NavigatorAmbientLightSensor.h"
+
+#include "bindings/core/v8/ExceptionState.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/frame/Navigator.h"
+
+namespace blink {
+
+NavigatorAmbientLightSensor::NavigatorAmbientLightSensor()
+{
+}
+
+// static
+NavigatorAmbientLightSensor& NavigatorAmbientLightSensor::from(Navigator& navigator)
+{
+    NavigatorAmbientLightSensor* supplement = static_cast<NavigatorAmbientLightSensor*>(Supplement<Navigator>::from(navigator, supplementName()));
+    if (!supplement) {
+        supplement = new NavigatorAmbientLightSensor();
+        provideTo(navigator, supplementName(), supplement);
+    }
+    return *supplement;
+}
+
+// static
+AmbientLightSensor* NavigatorAmbientLightSensor::lightSensor(ExecutionContext* context, Navigator& navigator, ExceptionState& exceptionState)
+{
+    NavigatorAmbientLightSensor& self = NavigatorAmbientLightSensor::from(navigator);
+    if (!self.m_lightSensors)
+        self.m_lightSensors = AmbientLightSensor::create(context, exceptionState);
+
+    if (exceptionState.hadException())
+        return nullptr;
+
+    return self.m_lightSensors.get();
+}
+
+// static
+const char* NavigatorAmbientLightSensor::supplementName()
+{
+    return "NavigatorAmbientLightSensor";
+}
+
+NavigatorAmbientLightSensor::~NavigatorAmbientLightSensor()
+{
+}
+
+DEFINE_TRACE(NavigatorAmbientLightSensor)
+{
+    visitor->trace(m_lightSensors);
+    Supplement<Navigator>::trace(visitor);
+}
+
+} // namespace blink