1 files changed, 209 insertions, 0 deletions
diff --git a/platform/android/src/geometry/conversion/feature.hpp b/platform/android/src/geometry/conversion/feature.hpp
new file mode 100644
index 0000000000..857b76da50
--- /dev/null
+++ b/platform/android/src/geometry/conversion/feature.hpp
@@ -0,0 +1,209 @@
+#pragma once
+
+#include "../../conversion/constant.hpp"
+#include "../../conversion/conversion.hpp"
+#include "geometry.hpp"
+
+#include <mbgl/util/feature.hpp>
+#include <mapbox/variant.hpp>
+#include <mapbox/geometry.hpp>
+
+#include <jni/jni.hpp>
+#include "../../jni/local_object.hpp"
+
+#include <string>
+#include <array>
+#include <vector>
+#include <sstream>
+
+#include <mbgl/platform/log.hpp>
+
+namespace mbgl {
+namespace android {
+namespace conversion {
+
+/**
+ * Turn feature identifier into std::string
+ */
+class FeatureIdVisitor {
+public:
+
+    template<class T>
+    std::string operator()(const T& i) const {
+        return std::to_string(i);
+    }
+
+    std::string operator()(const std::string& i) const {
+        return i;
+    }
+
+    std::string operator()(const std::nullptr_t&) const {
+        return "";
+    }
+
+};
+
+/**
+ * Turn properties into Java GSON JsonObject's
+ */
+class PropertyValueEvaluator {
+public:
+    jni::JNIEnv& env;
+
+    /**
+     * null
+     */
+    jni::jobject* operator()(const mapbox::geometry::null_value_t &) const {
+        return (jni::jobject*) nullptr;
+    }
+
+    /**
+     * Boolean primitive
+     */
+    jni::jobject* operator()(const bool& value) const {
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "com/google/gson/JsonPrimitive")).release();
+        static jni::jmethodID* constructor = &jni::GetMethodID(env, *javaClass, "<init>", "(Z)V");
+
+        //Create JsonPrimitive
+        jni::LocalObject<jni::jobject> converted = jni::NewLocalObject(env, *convert<jni::jobject*, bool>(env, value));
+        jni::jobject* object = &jni::NewObject(env, *javaClass, *constructor, *converted);
+
+        return object;
+    }
+
+    /**
+     * String primitive
+     */
+    jni::jobject* operator()(const std::string& value) const {
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "com/google/gson/JsonPrimitive")).release();
+        static jni::jmethodID* constructor = &jni::GetMethodID(env, *javaClass, "<init>", "(Ljava/lang/String;)V");
+
+        //Create JsonPrimitive
+        jni::LocalObject<jni::jobject> converted = jni::NewLocalObject(env, *convert<jni::jobject*, std::string>(env, value));
+        jni::jobject* object = &jni::NewObject(env, *javaClass, *constructor, converted.get());
+
+        return object;
+    }
+
+    /**
+     * Number primitives
+     */
+    template <class Number>
+    jni::jobject* operator()(const Number& value) const {
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "com/google/gson/JsonPrimitive")).release();
+        static jni::jmethodID* constructor = &jni::GetMethodID(env, *javaClass, "<init>", "(Ljava/lang/Number;)V");
+
+        //Create JsonPrimitive
+        jni::LocalObject<jni::jobject> converted = jni::NewLocalObject(env, *convert<jni::jobject*, Number>(env, value));
+        jni::jobject* object = &jni::NewObject(env, *javaClass, *constructor, converted.get());
+
+        return object;
+    }
+
+
+    /**
+     * Json Array
+     */
+    jni::jobject* operator()(const std::vector<mbgl::Value> &values) const {
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "com/google/gson/JsonArray")).release();
+        static jni::jmethodID* constructor = &jni::GetMethodID(env, *javaClass, "<init>", "()V");;
+        static jni::jmethodID* add = &jni::GetMethodID(env, *javaClass, "add", "(Lcom/google/gson/JsonElement;)V");
+
+        //Create json array
+        jni::jobject* jarray = &jni::NewObject(env, *javaClass, *constructor);
+
+        //Add values
+        for (const auto &v : values) {
+            jni::LocalObject<jni::jobject> converted = jni::NewLocalObject(env, mbgl::Value::visit(v, *this));
+            jni::CallMethod<void>(env, jarray, *add, converted.get());
+        }
+
+        return jarray;
+    }
+
+    /**
+     * Json Object
+     */
+    jni::jobject* operator()(const std::unordered_map<std::string, mbgl::Value> &value) const {
+        //TODO: clean up duplication here
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "com/google/gson/JsonObject")).release();
+        static jni::jmethodID* constructor = &jni::GetMethodID(env, *javaClass, "<init>", "()V");;
+        static jni::jmethodID* add = &jni::GetMethodID(env, *javaClass, "add", "(Ljava/lang/String;Lcom/google/gson/JsonElement;)V");
+
+        //Create json object
+        jni::jobject* jsonObject = &jni::NewObject(env, *javaClass, *constructor);
+
+        //Add items
+        for (auto &item : value) {
+            jni::LocalObject<jni::jobject> converted = jni::NewLocalObject(env, mbgl::Value::visit(item.second, *this));
+            jni::LocalObject<jni::jobject> key = jni::NewLocalObject(env, *convert<jni::jobject*, std::string>(env, item.first));
+            jni::CallMethod<void>(env, jsonObject, *add, key.get(), converted.get());
+        }
+
+        return jsonObject;
+    }
+};
+
+template <>
+struct Converter<jni::jobject*, std::unordered_map<std::string, mbgl::Value>> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const std::unordered_map<std::string, mbgl::Value>& value) const {
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "com/google/gson/JsonObject")).release();
+        static jni::jmethodID* constructor = &jni::GetMethodID(env, *javaClass, "<init>", "()V");;
+        static jni::jmethodID* add = &jni::GetMethodID(env, *javaClass, "add", "(Ljava/lang/String;Lcom/google/gson/JsonElement;)V");
+
+        //Create json object
+        jni::jobject* jsonObject = &jni::NewObject(env, *javaClass, *constructor);
+
+        //Add items
+        PropertyValueEvaluator evaluator {env};
+        for (auto &item : value) {
+            jni::LocalObject<jni::jobject> converted = jni::NewLocalObject(env, mbgl::Value::visit(item.second, evaluator));
+            jni::LocalObject<jni::jobject> key = jni::NewLocalObject(env, *convert<jni::jobject*, std::string>(env, item.first));
+            jni::CallMethod<void>(env, jsonObject, *add, key.get(), converted.get());
+        }
+
+        return {jsonObject};
+    }
+};
+
+
+template <>
+struct Converter<jni::jobject*, mbgl::Feature> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const mbgl::Feature& value) const {
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "com/mapbox/services/commons/geojson/Feature")).release();
+        static jni::jmethodID* fromGeometry = &jni::GetStaticMethodID(env, *javaClass, "fromGeometry", "(Lcom/mapbox/services/commons/geojson/Geometry;Lcom/google/gson/JsonObject;Ljava/lang/String;)Lcom/mapbox/services/commons/geojson/Feature;");
+
+        //Convert Id
+        FeatureIdVisitor idEvaluator;
+        std::string id = (value.id) ? mapbox::geometry::identifier::visit(value.id.value(), idEvaluator) : "";
+        jni::LocalObject<jni::jobject> jid = jni::NewLocalObject(env, *convert<jni::jobject*>(env, id));
+
+        //Convert properties
+        jni::LocalObject<jni::jobject> properties = jni::NewLocalObject(env, *convert<jni::jobject*>(env, value.properties));
+
+        //Convert geometry
+        jni::LocalObject<jni::jobject> geometry = jni::NewLocalObject(env, *convert<jni::jobject*>(env, value.geometry));
+
+        //Create feature
+        return {reinterpret_cast<jni::jobject*>(jni::CallStaticMethod<jni::jobject*>(env, *javaClass, *fromGeometry, geometry.get(), properties.get(), jid.get()))};
+    }
+};
+
+template <>
+struct Converter<jni::jarray<jni::jobject>*, std::vector<mbgl::Feature>> {
+    Result<jni::jarray<jni::jobject>*> operator()(jni::JNIEnv& env, const std::vector<mbgl::Feature>& value) const {
+        static jni::jclass* featureClass = jni::NewGlobalRef(env, &jni::FindClass(env, "com/mapbox/services/commons/geojson/Feature")).release();
+        jni::jarray<jni::jobject>& jarray = jni::NewObjectArray(env, value.size(), *featureClass);
+
+        for(size_t i = 0; i < value.size(); i = i + 1) {
+            jni::LocalObject<jni::jobject> converted = jni::NewLocalObject(env, *convert<jni::jobject*, mbgl::Feature>(env, value.at(i)));
+            jni::SetObjectArrayElement(env, jarray, i, converted.get());
+        }
+
+        return {&jarray};
+    }
+};
+
+} // namespace conversion
+} // namespace android
+} // namespace mbgl