[android] bindings for aggregated cluster properties (#15425)

* [android] bindings for aggregated cluster properties

* [android] change the parameter type for adding clusterProperty

* [android] add changelog

* remove extra emplty line

5 files changed, 33 insertions, 3 deletions

diff --git a/platform/android/src/java_types.cpp b/platform/android/src/java_types.cpp
index dd165470cf..7a1ba93a58 100644
--- a/platform/android/src/java_types.cpp
+++ b/platform/android/src/java_types.cpp
@@ -18,6 +18,10 @@ namespace java {
 
     jni::jclass* Map::jclass;
     jni::jmethodID* Map::getMethodId;
+    jni::jmethodID* Map::keySetMethodId;
+
+    jni::jclass* Set::jclass;
+    jni::jmethodID* Set::toArrayMethodId;
 
     void registerNatives(JNIEnv& env) {
         ObjectArray::jclass = jni::NewGlobalRef(env, &jni::FindClass(env, "[Ljava/lang/Object;")).release();
@@ -34,6 +38,10 @@ namespace java {
 
         Map::jclass = jni::NewGlobalRef(env, &jni::FindClass(env, "java/util/Map")).release();
         Map::getMethodId = &jni::GetMethodID(env, *Map::jclass, "get", "(Ljava/lang/Object;)Ljava/lang/Object;");
+        Map::keySetMethodId = &jni::GetMethodID(env, *Map::jclass, "keySet", "()Ljava/util/Set;");
+
+        Set::jclass = jni::NewGlobalRef(env, &jni::FindClass(env, "java/util/Set")).release();
+        Set::toArrayMethodId = &jni::GetMethodID(env, *Set::jclass, "toArray", "()[Ljava/lang/Object;");
     }
 
 }
diff --git a/platform/android/src/java_types.hpp b/platform/android/src/java_types.hpp
index edec5cb550..c7c93ce71b 100644
--- a/platform/android/src/java_types.hpp
+++ b/platform/android/src/java_types.hpp
@@ -29,6 +29,12 @@ namespace java {
     struct Map {
         static jni::jclass* jclass;
         static jni::jmethodID* getMethodId;
+        static jni::jmethodID* keySetMethodId;
+    };
+
+    struct Set {
+        static jni::jclass* jclass;
+        static jni::jmethodID* toArrayMethodId;
     };
 
     void registerNatives(JNIEnv&);
diff --git a/platform/android/src/style/android_conversion.hpp b/platform/android/src/style/android_conversion.hpp
index 8559720b2f..d38dbfa684 100644
--- a/platform/android/src/style/android_conversion.hpp
+++ b/platform/android/src/style/android_conversion.hpp
@@ -47,9 +47,18 @@ public:
     }
 
     template <class Fn>
-    static optional<Error> eachMember(const mbgl::android::Value&, Fn&&) {
-        // TODO
-        mbgl::Log::Warning(mbgl::Event::Android, "eachMember not implemented");
+    static optional<Error> eachMember(const mbgl::android::Value& value, Fn&& fn) {
+        assert(value.isObject());
+        mbgl::android::Value keys = value.keyArray();
+        std::size_t length = arrayLength(keys);
+        for(std::size_t i = 0; i < length; ++i){
+            const auto k = keys.get(i).toString();
+            auto v = value.get(k.c_str());
+            optional<Error> result = fn(k, std::move(v));
+            if (result) {
+                return result;
+            }
+        }
         return {};
     }
 
diff --git a/platform/android/src/style/value.cpp b/platform/android/src/style/value.cpp
index f916909687..2f04840729 100644
--- a/platform/android/src/style/value.cpp
+++ b/platform/android/src/style/value.cpp
@@ -63,6 +63,12 @@ namespace android {
         return Value(env, jni::Local<jni::Object<>>(env, member));
     }
 
+    Value Value::keyArray() const{
+        jni::jobject* set = jni::CallMethod<jni::jobject*>(env, value.get(), *java::Map::keySetMethodId);
+        jni::jobject* array = jni::CallMethod<jni::jobject*>(env, set, *java::Set::toArrayMethodId);
+        return Value(env, jni::Local<jni::Object<>>(env, array));
+    }
+
     int Value::getLength() const {
         auto array = (jni::jarray<jni::jobject>*) value.get();
         return jni::GetArrayLength(env, *array);
diff --git a/platform/android/src/style/value.hpp b/platform/android/src/style/value.hpp
index 0c702bb465..b507c5ed11 100644
--- a/platform/android/src/style/value.hpp
+++ b/platform/android/src/style/value.hpp
@@ -31,6 +31,7 @@ public:
     long toLong() const;
     bool toBool() const;
     Value get(const char* key) const;
+    Value keyArray() const;
     int getLength() const;
     Value get(const int index ) const;