Move JNI bindings code from mapbox-gl-native to this repo. (#301)

MapboxGLAndroidSDK/src/cpp/geojson/feature_collection.cpp

@@ -0,0 +1,37 @@
+#include "feature_collection.hpp"
+
+#include "feature.hpp"
+
+namespace mbgl {
+namespace android {
+namespace geojson {
+
+mbgl::FeatureCollection FeatureCollection::convert(jni::JNIEnv& env, const jni::Object<FeatureCollection>& jCollection) {
+    auto collection = mbgl::FeatureCollection();
+
+    if (jCollection) {
+        auto jFeatureList = FeatureCollection::features(env, jCollection);
+        auto jFeatures = java::util::List::toArray<Feature>(env, jFeatureList);
+        auto size = size_t(jFeatures.Length(env));
+        collection.reserve(size);
+
+        for (size_t i = 0; i < size; i++) {
+            collection.push_back(Feature::convert(env, jFeatures.Get(env, i)));
+        }
+    }
+    return collection;
+}
+
+jni::Local<jni::Object<java::util::List>> FeatureCollection::features(jni::JNIEnv& env, const jni::Object<FeatureCollection>& jCollection) {
+    static auto& javaClass = jni::Class<FeatureCollection>::Singleton(env);
+    static auto method = javaClass.GetMethod<jni::Object<java::util::List> ()>(env, "features");
+    return jCollection.Call(env, method);
+}
+
+void FeatureCollection::registerNative(jni::JNIEnv& env) {
+    jni::Class<FeatureCollection>::Singleton(env);
+}
+
+} // namespace geojson
+} // namespace android
+} // namespace mbgl