Upstream Android Geolocation

content/browser/geolocation/location_api_adapter_android.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/geolocation/location_api_adapter_android.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/bind.h"
+#include "base/location.h"
+#include "content/browser/geolocation/location_provider_android.h"
+#include "jni/location_provider_jni.h"
+
+using base::android::AttachCurrentThread;
+using base::android::CheckException;
+using base::android::ClearException;
+using base::android::GetMethodID;
+
+static void NewLocationAvailable(JNIEnv* env, jclass,
+                                 jdouble latitude,
+                                 jdouble longitude,
+                                 jlong time_stamp,
+                                 jboolean has_altitude, jdouble altitude,
+                                 jboolean has_accuracy, jdouble accuracy,
+                                 jboolean has_heading, jdouble heading,
+                                 jboolean has_speed, jdouble speed) {
+  AndroidLocationApiAdapter::OnNewLocationAvailable(latitude, longitude,
+      time_stamp, has_altitude, altitude, has_accuracy, accuracy,
+      has_heading, heading, has_speed, speed);
+}
+
+static void NewErrorAvailable(JNIEnv* env, jclass, jstring message) {
+  AndroidLocationApiAdapter::OnNewErrorAvailable(env, message);
+}
+
+AndroidLocationApiAdapter::AndroidLocationApiAdapter()
+    : location_provider_(NULL) {
+}
+
+AndroidLocationApiAdapter::~AndroidLocationApiAdapter() {
+  CHECK(!location_provider_);
+  CHECK(!message_loop_);
+  CHECK(java_location_provider_android_object_.is_null());
+}
+
+bool AndroidLocationApiAdapter::Start(
+    LocationProviderAndroid* location_provider, bool high_accuracy) {
+  JNIEnv* env = AttachCurrentThread();
+  if (!location_provider_) {
+    location_provider_ = location_provider;
+    CHECK(java_location_provider_android_object_.is_null());
+    CreateJavaObject(env);
+    {
+      base::AutoLock lock(lock_);
+      CHECK(!message_loop_.get());
+      message_loop_ = base::MessageLoopProxy::current();
+    }
+  }
+  // At this point we should have all our pre-conditions ready, and they'd only
+  // change in Stop() which must be called on the same thread as here.
+  CHECK(location_provider_);
+  CHECK(message_loop_.get());
+  CHECK(!java_location_provider_android_object_.is_null());
+  // We'll start receiving notifications from java in the main thread looper
+  // until Stop() is called.
+  return Java_LocationProvider_start(env,
+      java_location_provider_android_object_.obj(), high_accuracy);
+}
+
+void AndroidLocationApiAdapter::Stop() {
+  if (!location_provider_) {
+    CHECK(!message_loop_.get());
+    CHECK(java_location_provider_android_object_.is_null());
+    return;
+  }
+
+  {
+    base::AutoLock lock(lock_);
+    message_loop_ = NULL;
+  }
+
+  location_provider_ = NULL;
+
+  JNIEnv* env = AttachCurrentThread();
+  Java_LocationProvider_stop(env, java_location_provider_android_object_.obj());
+  java_location_provider_android_object_.Reset();
+}
+
+// static
+void AndroidLocationApiAdapter::NotifyProviderNewGeoposition(
+    const content::Geoposition& geoposition) {
+  // Called on the geolocation thread, safe to access location_provider_ here.
+  if (GetInstance()->location_provider_) {
+    CHECK(GetInstance()->message_loop_->BelongsToCurrentThread());
+    GetInstance()->location_provider_->NotifyNewGeoposition(geoposition);
+  }
+}
+
+// static
+void AndroidLocationApiAdapter::OnNewLocationAvailable(
+    double latitude, double longitude, long time_stamp,
+    bool has_altitude, double altitude,
+    bool has_accuracy, double accuracy,
+    bool has_heading, double heading,
+    bool has_speed, double speed) {
+  content::Geoposition position;
+  position.latitude = latitude;
+  position.longitude = longitude;
+  position.timestamp = base::Time::FromDoubleT(time_stamp / 1000.0);
+  if (has_altitude)
+    position.altitude = altitude;
+  if (has_accuracy)
+    position.accuracy = accuracy;
+  if (has_heading)
+    position.heading = heading;
+  if (has_speed)
+    position.speed = speed;
+  GetInstance()->OnNewGeopositionInternal(position);
+}
+
+// static
+void AndroidLocationApiAdapter::OnNewErrorAvailable(JNIEnv* env,
+                                                    jstring message) {
+  content::Geoposition position_error;
+  position_error.error_code =
+      content::Geoposition::ERROR_CODE_POSITION_UNAVAILABLE;
+  position_error.error_message =
+      base::android::ConvertJavaStringToUTF8(env, message);
+  GetInstance()->OnNewGeopositionInternal(position_error);
+}
+
+// static
+AndroidLocationApiAdapter* AndroidLocationApiAdapter::GetInstance() {
+  return Singleton<AndroidLocationApiAdapter>::get();
+}
+
+// static
+bool AndroidLocationApiAdapter::RegisterGeolocationService(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+void AndroidLocationApiAdapter::CreateJavaObject(JNIEnv* env) {
+  // Create the Java AndroidLocationProvider object.
+  java_location_provider_android_object_.Reset(
+      Java_LocationProvider_create(env,
+          base::android::GetApplicationContext()));
+  CHECK(!java_location_provider_android_object_.is_null());
+}
+
+void AndroidLocationApiAdapter::OnNewGeopositionInternal(
+    const content::Geoposition& geoposition) {
+  base::AutoLock lock(lock_);
+  if (!message_loop_)
+    return;
+  message_loop_->PostTask(
+      FROM_HERE,
+      base::Bind(
+          &AndroidLocationApiAdapter::NotifyProviderNewGeoposition,
+          geoposition));
+}