[android] geojson conversion optimisation

1 files changed, 48 insertions, 0 deletions

diff --git a/platform/android/src/geojson/polygon.cpp b/platform/android/src/geojson/polygon.cpp
new file mode 100644
index 0000000000..bb37b8d99e
--- /dev/null
+++ b/platform/android/src/geojson/polygon.cpp
@@ -0,0 +1,48 @@
+#include "polygon.hpp"
+
+#include "multi_line_string.hpp"
+
+namespace mbgl {
+namespace android {
+namespace geojson {
+
+mapbox::geojson::polygon Polygon::convert(jni::JNIEnv &env, jni::Object<Polygon> jPolygon) {
+    mapbox::geojson::polygon polygon;
+
+    if (jPolygon) {
+        auto jPositionListsList = Polygon::getCoordinates(env, jPolygon);
+        polygon = Polygon::convert(env, jPositionListsList);
+        jni::DeleteLocalRef(env, jPositionListsList);
+    }
+
+    return polygon;
+}
+
+mapbox::geojson::polygon Polygon::convert(jni::JNIEnv &env, jni::Object<java::util::List/*<java::util::List<Position>>*/> jPositionListsList) {
+    mapbox::geojson::polygon polygon;
+
+    if (jPositionListsList) {
+        auto multiLine = MultiLineString::convert(env, jPositionListsList);
+        polygon.reserve(multiLine.size());
+        polygon.insert(std::end(polygon), std::begin(multiLine), std::end(multiLine));
+    }
+
+    return polygon;
+}
+
+
+jni::Object<java::util::List> Polygon::getCoordinates(jni::JNIEnv &env, jni::Object<Polygon> jPolygon) {
+    static auto method = Polygon::javaClass.GetMethod<jni::Object<java::util::List> ()>(env, "getCoordinates");
+    return jPolygon.Call(env, method);
+}
+
+void Polygon::registerNative(jni::JNIEnv &env) {
+    // Lookup the class
+    javaClass = *jni::Class<Polygon>::Find(env).NewGlobalRef(env).release();
+}
+
+jni::Class<Polygon> Polygon::javaClass;
+
+} // namespace geojson
+} // namespace android
+} // namespace mbgl
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