[android] high-level jni bindings for geojson conversion

1 files changed, 38 insertions, 0 deletions

diff --git a/platform/android/src/geojson/util.hpp b/platform/android/src/geojson/util.hpp
index ece8e52433..5e6d90a953 100644
--- a/platform/android/src/geojson/util.hpp
+++ b/platform/android/src/geojson/util.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "point.hpp"
+
 #include <type_traits>
 
 namespace mbgl {
@@ -17,6 +19,42 @@ To convertExplicit(From&& src) {
     return *reinterpret_cast<std::add_pointer_t<To>>(&src);
 }
 
+/**
+ *  Geometry -> List<Point>
+ */
+template <class T>
+static jni::Object<java::util::List> asPointsList(jni::JNIEnv& env, const T& pointsList) {
+    auto jarray = jni::Array<jni::Object<Point>>::New(env, pointsList.size(), Point::javaClass);
+
+    for (jni::jsize i = 0; i < pointsList.size(); i++) {
+        auto jPoint = Point::New(env, pointsList.at(i));
+        jarray.Set(env, i, jPoint);
+        jni::DeleteLocalRef(env, jPoint);
+    }
+
+    auto jList = java::util::Arrays::asList(env, jarray);
+    jni::DeleteLocalRef(env, jarray);
+    return jList;
+}
+
+/**
+ *  Geometry -> List<List<Point>>
+ */
+template <class SHAPE>
+static jni::Object<java::util::List> asPointsListsList(JNIEnv& env, SHAPE value) {
+    auto jarray = jni::Array<jni::Object<java::util::List>>::New(env, value.size(), java::util::List::javaClass);
+
+    for (size_t i = 0; i < value.size(); i = i + 1) {
+        auto pointsList = asPointsList(env, value[i]);
+        jarray.Set(env, i, pointsList);
+        jni::DeleteLocalRef(env, pointsList);
+    }
+
+    auto jList = java::util::Arrays::asList(env, jarray);
+    jni::DeleteLocalRef(env, jarray);
+    return jList;
+}
+
 } // namespace geojson
 } // namespace android
 } // namespace mbgl