[android] #5610 - Runtime style api - part 2

1 files changed, 95 insertions, 0 deletions

diff --git a/platform/android/src/conversion/constant.hpp b/platform/android/src/conversion/constant.hpp
new file mode 100644
index 0000000000..9a570d3717
--- /dev/null
+++ b/platform/android/src/conversion/constant.hpp
@@ -0,0 +1,95 @@
+#pragma once
+
+#include "conversion.hpp"
+
+#include <mbgl/util/optional.hpp>
+#include <jni/jni.hpp>
+
+#include <string>
+#include <array>
+#include <vector>
+#include <sstream>
+
+namespace mbgl {
+namespace android {
+namespace conversion {
+
+template <>
+struct Converter<jni::jobject*, bool> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const bool& value) const {
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "java/lang/Boolean")).release();
+        static jni::jmethodID* constructor = &jni::GetMethodID(env, *javaClass, "<init>", "(Z)V");
+        return {&jni::NewObject(env, *javaClass, *constructor, (jboolean) value)};
+    }
+};
+
+template <>
+struct Converter<jni::jobject*, float> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const float& value) const {
+        static jni::jclass* javaClass = jni::NewGlobalRef(env, &jni::FindClass(env, "java/lang/Float")).release();
+        static jni::jmethodID* constructor = &jni::GetMethodID(env, *javaClass, "<init>", "(F)V");
+        return {&jni::NewObject(env, *javaClass, *constructor, (jfloat) value)};
+    }
+};
+
+template <>
+struct Converter<jni::jobject*, std::string> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const std::string& value) const {
+        return {jni::Make<jni::String>(env, value).Get()};
+    }
+};
+
+template <>
+struct Converter<jni::jobject*, Color> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const Color& value) const {
+        std::stringstream sstream;
+        sstream << "rgba(" << value.r << ", " << value.g << ", " << value.b << ", "  << value.a << ")";
+        std::string result = sstream.str();
+        return convert<jni::jobject*, std::string>(env, result);
+    }
+};
+
+template <std::size_t N>
+struct Converter<jni::jobject*, std::array<float, N>> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const std::array<float, N>& value) const {
+        std::vector<float> v;
+        for (const float& id : value) {
+            v.push_back(id);
+        }
+        return convert<jni::jobject*, std::vector<float>>(env, v);
+    }
+};
+
+template <>
+struct Converter<jni::jobject*, std::vector<std::string>> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const std::vector<std::string>& value) const {
+        static jni::jclass* stringCass = jni::NewGlobalRef(env, &jni::FindClass(env, "java/lang/String")).release();
+        jni::jarray<jni::jobject>& jarray = jni::NewObjectArray(env, value.size(), *stringCass);
+
+        for(size_t i = 0; i < value.size(); i = i + 1) {
+            Result<jni::jobject*> converted = convert<jni::jobject*, std::string>(env, value.at(i));
+            jni::SetObjectArrayElement(env, jarray, i, *converted);
+        }
+
+        return &jarray;
+    }
+};
+
+template <>
+struct Converter<jni::jobject*, std::vector<float>> {
+    Result<jni::jobject*> operator()(jni::JNIEnv& env, const std::vector<float>& value) const {
+        static jni::jclass* floatClass = jni::NewGlobalRef(env, &jni::FindClass(env, "java/lang/Float")).release();
+        jni::jarray<jni::jobject>& jarray = jni::NewObjectArray(env, value.size(), *floatClass);
+
+        for(size_t i = 0; i < value.size(); i = i + 1) {
+            Result<jni::jobject*> converted = convert<jni::jobject*, float>(env, value.at(i));
+            jni::SetObjectArrayElement(env, jarray, i, *converted);
+        }
+
+        return &jarray;
+    }
+};
+
+} // namespace conversion
+} // namespace style
+} // namespace mbgl