[android] - add binding integration for RasterDEMSource, add example

platform/android/src/style/sources/raster_dem_source.cpp

@@ -0,0 +1,63 @@
+#include "raster_dem_source.hpp"
+
+#include "../android_conversion.hpp"
+#include "../value.hpp"
+#include "../conversion/url_or_tileset.hpp"
+#include "source.hpp"
+
+#include <mbgl/util/variant.hpp>
+
+#include <string>
+
+namespace mbgl {
+namespace android {
+
+    RasterDEMSource::RasterDEMSource(jni::JNIEnv& env, jni::String sourceId, jni::Object<> urlOrTileSet, jni::jint tileSize)
+        : Source(
+            env,
+            std::make_unique<mbgl::style::RasterDEMSource>(
+                jni::Make<std::string>(env, sourceId),
+                convertURLOrTileset(Value(env, urlOrTileSet)),
+                tileSize
+            )
+        ) {
+    }
+
+    RasterDEMSource::RasterDEMSource(jni::JNIEnv& env,
+                               mbgl::style::Source& coreSource,
+                               AndroidRendererFrontend& frontend)
+         : Source(env, coreSource, createJavaPeer(env), frontend) {
+    }
+
+    RasterDEMSource::~RasterDEMSource() = default;
+
+    jni::String RasterDEMSource::getURL(jni::JNIEnv& env) {
+        optional<std::string> url = source.as<mbgl::style::RasterDEMSource>()->RasterDEMSource::getURL();
+        return url ? jni::Make<jni::String>(env, *url) : jni::String();
+    }
+
+    jni::Class<RasterDEMSource> RasterDEMSource::javaClass;
+
+    jni::Object<Source> RasterDEMSource::createJavaPeer(jni::JNIEnv& env) {
+        static auto constructor = RasterDEMSource::javaClass.template GetConstructor<jni::jlong>(env);
+        return jni::Object<Source>(RasterDEMSource::javaClass.New(env, constructor, reinterpret_cast<jni::jlong>(this)).Get());
+    }
+
+    void RasterDEMSource::registerNative(jni::JNIEnv& env) {
+        // Lookup the class
+        RasterDEMSource::javaClass = *jni::Class<RasterDEMSource>::Find(env).NewGlobalRef(env).release();
+
+        #define METHOD(MethodPtr, name) jni::MakeNativePeerMethod<decltype(MethodPtr), (MethodPtr)>(name)
+
+        // Register the peer
+        jni::RegisterNativePeer<RasterDEMSource>(
+            env, RasterDEMSource::javaClass, "nativePtr",
+            std::make_unique<RasterDEMSource, JNIEnv&, jni::String, jni::Object<>, jni::jint>,
+            "initialize",
+            "finalize",
+            METHOD(&RasterDEMSource::getURL, "nativeGetUrl")
+        );
+    }
+
+} // namespace android
+} // namespace mbgl