[android] remove source returns reference

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapboxMap.java

@@ -350,20 +350,24 @@ public final class MapboxMap {
    * Removes the source. Any references to the source become invalid and should not be used anymore
    *
    * @param sourceId the source to remove
+   * @return the source handle or null if the source was not present
    */
   @UiThread
-  public void removeSource(@NonNull String sourceId) {
-    nativeMapView.removeSource(sourceId);
+  @Nullable
+  public Source removeSource(@NonNull String sourceId) {
+    return nativeMapView.removeSource(sourceId);
   }
 
   /**
    * Removes the source, preserving the reverence for re-use
    *
    * @param source the source to remove
+   * @return the source
    */
   @UiThread
-  public void removeSource(@NonNull Source source) {
-    nativeMapView.removeSource(source);
+  @Nullable
+  public Source removeSource(@NonNull Source source) {
+    return nativeMapView.removeSource(source);
   }
 
   /**

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/NativeMapView.java

@@ -806,18 +806,20 @@ final class NativeMapView {
     nativeAddSource(source.getNativePtr());
   }
 
-  public void removeSource(@NonNull String sourceId) {
+  @Nullable
+  public Source removeSource(@NonNull String sourceId) {
     if (isDestroyedOn("removeSource")) {
-      return;
+      return null;
     }
-    nativeRemoveSourceById(sourceId);
+    return nativeRemoveSourceById(sourceId);
   }
 
-  public void removeSource(@NonNull Source source) {
+  public Source removeSource(@NonNull Source source) {
     if (isDestroyedOn("removeSource")) {
-      return;
+      return null;
     }
     nativeRemoveSource(source.getNativePtr());
+    return source;
   }
 
   public void addImage(@NonNull String name, @NonNull Bitmap image) {
@@ -1087,7 +1089,7 @@ final class NativeMapView {
 
   private native void nativeAddSource(long nativeSourcePtr) throws CannotAddSourceException;
 
-  private native void nativeRemoveSourceById(String sourceId);
+  private native Source nativeRemoveSourceById(String sourceId);
 
   private native void nativeRemoveSource(long sourcePtr);
 

platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/RuntimeStyleTests.java

@@ -192,7 +192,8 @@ public class RuntimeStyleTests {
       mapboxMap.addSource(new VectorSource("my-source", "mapbox://mapbox.mapbox-terrain-v2"));
 
       // Remove
-      mapboxMap.removeSource("my-source");
+      Source mySource = mapboxMap.removeSource("my-source");
+      assertNotNull(mySource);
       assertNull(mapboxMap.getLayer("my-source"));
 
       // Add

platform/android/src/native_map_view.cpp

@@ -844,8 +844,13 @@ void NativeMapView::addSource(JNIEnv& env, jni::jlong sourcePtr) {
     }
 }
 
-void NativeMapView::removeSourceById(JNIEnv& env, jni::String id) {
-     map->removeSource(jni::Make<std::string>(env, id));
+jni::Object<Source> NativeMapView::removeSourceById(JNIEnv& env, jni::String id) {
+    std::unique_ptr<mbgl::style::Source> coreSource = map->removeSource(jni::Make<std::string>(env, id));
+    if (coreSource) {
+        return jni::Object<Source>(createJavaSourcePeer(env, *map, *coreSource));
+    } else {
+        return jni::Object<Source>();
+    }
 }
 
 void NativeMapView::removeSource(JNIEnv&, jlong sourcePtr) {

platform/android/src/native_map_view.hpp

@@ -217,7 +217,7 @@ public:
 
     void addSource(JNIEnv&, jni::jlong);
 
-    void removeSourceById(JNIEnv&, jni::String);
+    jni::Object<Source> removeSourceById(JNIEnv&, jni::String);
 
     void removeSource(JNIEnv&, jlong);