[android] - expose source layer identifier (#8709)

3 files changed, 24 insertions, 3 deletions

diff --git a/platform/android/src/style/layers/layer.cpp b/platform/android/src/style/layers/layer.cpp
index 6c9de51a0d..58c0c5ee84 100644
--- a/platform/android/src/style/layers/layer.cpp
+++ b/platform/android/src/style/layers/layer.cpp
@@ -144,6 +144,25 @@ namespace android {
         }
     }
 
+    jni::String Layer::getSourceLayer(jni::JNIEnv& env) {
+        using namespace mbgl::style;
+
+        std::string sourceLayerId;
+        if (layer.is<FillLayer>()) {
+            sourceLayerId = layer.as<FillLayer>()->getSourceLayer();
+        } else if (layer.is<LineLayer>()) {
+            sourceLayerId = layer.as<LineLayer>()->getSourceLayer();
+        } else if (layer.is<SymbolLayer>()) {
+            sourceLayerId = layer.as<SymbolLayer>()->getSourceLayer();
+        } else if (layer.is<CircleLayer>()) {
+            sourceLayerId = layer.as<CircleLayer>()->getSourceLayer();
+        } else {
+            mbgl::Log::Warning(mbgl::Event::JNI, "Layer doesn't support source layer");
+        }
+
+        return jni::Make<jni::String>(env, sourceLayerId);
+    }
+
     jni::jfloat Layer::getMinZoom(jni::JNIEnv&){
         return layer.getMinZoom();
     }
@@ -180,6 +199,7 @@ namespace android {
             METHOD(&Layer::setPaintProperty, "nativeSetPaintProperty"),
             METHOD(&Layer::setFilter, "nativeSetFilter"),
             METHOD(&Layer::setSourceLayer, "nativeSetSourceLayer"),
+            METHOD(&Layer::getSourceLayer, "nativeGetSourceLayer"),
             METHOD(&Layer::getMinZoom, "nativeGetMinZoom"),
             METHOD(&Layer::getMaxZoom, "nativeGetMaxZoom"),
             METHOD(&Layer::setMinZoom, "nativeSetMinZoom"),
diff --git a/platform/android/src/style/layers/layer.hpp b/platform/android/src/style/layers/layer.hpp
index deea7a6613..78c3f80b48 100644
--- a/platform/android/src/style/layers/layer.hpp
+++ b/platform/android/src/style/layers/layer.hpp
@@ -66,9 +66,11 @@ public:
 
     /* common properties, but not shared by all */
 
-    void setFilter(jni::JNIEnv& env, jni::Array<jni::Object<>> jfilter);
+    void setFilter(jni::JNIEnv&, jni::Array<jni::Object<>>);
 
-    void setSourceLayer(jni::JNIEnv& env, jni::String sourceLayer);
+    void setSourceLayer(jni::JNIEnv&, jni::String);
+
+    jni::String getSourceLayer(jni::JNIEnv&);
 
     // Property getters
 
diff --git a/platform/android/src/style/layers/layer.hpp.ejs b/platform/android/src/style/layers/layer.hpp.ejs
index d1e84ac2d4..837049b4c3 100644
--- a/platform/android/src/style/layers/layer.hpp.ejs
+++ b/platform/android/src/style/layers/layer.hpp.ejs
@@ -44,7 +44,6 @@ public:
     jni::Object<TransitionOptions> get<%- camelize(property.name) %>Transition(jni::JNIEnv&);
 <% } -%>
 <% } -%>
-
     jni::jobject* createJavaPeer(jni::JNIEnv&);
 
 }; // class <%- camelize(type) %>Layer