[android] geojson conversion optimisation

1 files changed, 54 insertions, 0 deletions

diff --git a/platform/android/src/geojson/line_string.cpp b/platform/android/src/geojson/line_string.cpp
new file mode 100644
index 0000000000..d0719f2538
--- /dev/null
+++ b/platform/android/src/geojson/line_string.cpp
@@ -0,0 +1,54 @@
+#include "line_string.hpp"
+
+#include "position.hpp"
+
+namespace mbgl {
+namespace android {
+namespace geojson {
+
+mapbox::geojson::line_string LineString::convert(jni::JNIEnv &env, jni::Object<LineString> jLineString) {
+    mapbox::geojson::line_string lineString;
+
+    if (jLineString) {
+        auto jPositionList = LineString::getCoordinates(env, jLineString);
+        lineString = LineString::convert(env, jPositionList);
+        jni::DeleteLocalRef(env, jPositionList);
+    }
+
+    return lineString;
+}
+
+mapbox::geojson::line_string LineString::convert(jni::JNIEnv &env, jni::Object<java::util::List/*<Position>*/> jPositionList) {
+    mapbox::geojson::line_string lineString;
+
+    if (jPositionList) {
+        auto jPositionArray = java::util::List::toArray<Position>(env, jPositionList);
+
+        auto size = jPositionArray.Length(env);
+        for (std::size_t i = 0; i < size; i++) {
+            auto jPosition = jPositionArray.Get(env, i);
+            lineString.push_back(Position::convert(env, jPosition));
+            jni::DeleteLocalRef(env, jPosition);
+        }
+
+        jni::DeleteLocalRef(env, jPositionArray);
+    }
+
+    return lineString;
+}
+
+jni::Object<java::util::List> LineString::getCoordinates(jni::JNIEnv &env, jni::Object<LineString> jLineString) {
+    static auto method = LineString::javaClass.GetMethod<jni::Object<java::util::List> ()>(env, "getCoordinates");
+    return jLineString.Call(env, method);
+}
+
+void LineString::registerNative(jni::JNIEnv &env) {
+    // Lookup the class
+    javaClass = *jni::Class<LineString>::Find(env).NewGlobalRef(env).release();
+}
+
+jni::Class<LineString> LineString::javaClass;
+
+} // namespace geojson
+} // namespace android
+} // namespace mbgl
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