[android] geojson conversion optimisation

1 files changed, 46 insertions, 0 deletions

diff --git a/platform/android/src/geojson/multi_polygon.cpp b/platform/android/src/geojson/multi_polygon.cpp
new file mode 100644
index 0000000000..a55884a110
--- /dev/null
+++ b/platform/android/src/geojson/multi_polygon.cpp
@@ -0,0 +1,46 @@
+#include "multi_polygon.hpp"
+
+#include "polygon.hpp"
+
+namespace mbgl {
+namespace android {
+namespace geojson {
+
+mapbox::geojson::multi_polygon MultiPolygon::convert(jni::JNIEnv &env, jni::Object<MultiPolygon> jMultiPolygon) {
+    mapbox::geojson::multi_polygon multiPolygon;
+
+    if (jMultiPolygon) {
+        auto jPositionListsListList = MultiPolygon::getCoordinates(env, jMultiPolygon);
+        auto jPositionListsListArray = java::util::List::toArray<java::util::List>(env, jPositionListsListList);
+
+        auto size = jPositionListsListArray.Length(env);
+        multiPolygon.reserve(size);
+
+        for (size_t i = 0; i < size; i++) {
+            auto jPositionListsList = jPositionListsListArray.Get(env, i);
+            multiPolygon.push_back(Polygon::convert(env, jPositionListsList));
+            jni::DeleteLocalRef(env, jPositionListsList);
+        }
+
+        jni::DeleteLocalRef(env, jPositionListsListList);
+        jni::DeleteLocalRef(env, jPositionListsListArray);
+    }
+
+    return multiPolygon;
+}
+
+jni::Object<java::util::List> MultiPolygon::getCoordinates(jni::JNIEnv &env, jni::Object<MultiPolygon> jPolygon) {
+    static auto method = MultiPolygon::javaClass.GetMethod<jni::Object<java::util::List> ()>(env, "getCoordinates");
+    return jPolygon.Call(env, method);
+}
+
+void MultiPolygon::registerNative(jni::JNIEnv &env) {
+    // Lookup the class
+    javaClass = *jni::Class<MultiPolygon>::Find(env).NewGlobalRef(env).release();
+}
+
+jni::Class<MultiPolygon> MultiPolygon::javaClass;
+
+} // namespace geojson
+} // namespace android
+} // namespace mbgl
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