WIP : Generic Sensor API implementation

device/sensors/android/java/src/org/chromium/device/sensors/SensorImpl.java

+// 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.
+
+package org.chromium.device.sensors;
+
+import org.chromium.mojo.system.MojoException;
+import org.chromium.mojom.device.sensors.Sensor;
+import org.chromium.mojom.device.sensors.SensorClient;
+import org.chromium.mojom.device.sensors.SensorConfiguration;
+
+/**
+ * Implementation of Sensor mojo interface
+ * device/sensors/sensor.mojom
+ */
+public class SensorImpl implements Sensor, SensorProxy {
+    private final SensorBase mSensor;
+    private final SensorConfigurations mConfigurations = new SensorConfigurations();
+    private SensorClient mClient;
+
+    public SensorImpl(SensorBase sensor) {
+        mSensor = sensor;
+    }
+
+    @Override
+    public void setClient(SensorClient client) {
+        mClient = client;
+        mSensor.addSensorProxy(this);
+    }
+
+    @Override
+    public void start(SensorConfiguration configuration, StartResponse response) {
+        mConfigurations.add(configuration);
+        boolean startedListening = mSensor.startListening(this);
+        if (!startedListening) mConfigurations.remove(configuration);
+        response.call(startedListening);
+    }
+
+    @Override
+    public void stop(SensorConfiguration configuration, StopResponse response) {
+        mConfigurations.remove(configuration);
+        if (mConfigurations.isEmpty()) {
+            response.call(mSensor.stopListening(this));
+        } else {
+            response.call(mSensor.configuratoinUpdated());
+        }
+    }
+
+    @Override
+    public void close() {
+        mConfigurations.clear();
+        mSensor.stopListening(this);
+        mSensor.removeSensorProxy(this);
+    }
+
+    @Override
+    public void onConnectionError(MojoException e) {
+        close();
+    }
+
+    @Override
+    public SensorConfiguration getCurrentConfiguration() {
+        if (!mConfigurations.isEmpty()) return mConfigurations.get(0);
+        return null;
+    }
+
+    @Override
+    public void reportError() {
+        if (mClient != null) mClient.onSensorError();
+    }
+
+    @Override
+    public void reportSensorReadingChaned() {
+        if (mClient != null) mClient.onSensorReadingChanged();
+    }
+}