[android] #352 - android-conversion from runtime styling

platform/android/src/feature/android_conversion.hpp

@@ -0,0 +1,95 @@
+#pragma once
+
+#include "value.hpp"
+
+#include <mbgl/platform/log.hpp>
+#include <mbgl/style/conversion.hpp>
+#include <mbgl/util/feature.hpp>
+#include <mbgl/util/optional.hpp>
+
+#include <jni/jni.hpp>
+
+namespace mbgl {
+namespace style {
+namespace conversion {
+
+
+//XXX
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+
+inline bool isUndefined(const mbgl::android::Value& value) {
+    return value.isNull();
+}
+
+inline bool isArray(const mbgl::android::Value& value) {
+    return value.isArray();
+}
+
+inline bool isObject(const mbgl::android::Value& value) {
+    return value.isObject();
+}
+
+inline std::size_t arrayLength(const mbgl::android::Value& value) {
+    return value.getLength();;
+}
+
+inline mbgl::android::Value arrayMember(const mbgl::android::Value& value, std::size_t i) {
+    return value.get(i);
+}
+
+inline optional<mbgl::android::Value> objectMember(const mbgl::android::Value& value, const char* key) {
+    mbgl::android::Value member = value.get(key);
+
+    if (!member.isNull()) {
+        return member;
+    } else {
+        return {};
+    }
+}
+
+template <class Fn>
+optional<Error> eachMember(const mbgl::android::Value& value, Fn&& fn) {
+    //TODO
+    mbgl::Log::Warning(mbgl::Event::Android, "eachMember not implemented");
+    return {};
+}
+
+inline optional<bool> toBool(const mbgl::android::Value& value) {
+    if (value.isBool()) {
+        return value.toBool();
+    } else {
+        return {};
+    }
+}
+
+inline optional<float> toNumber(const mbgl::android::Value& value) {
+    if (value.isNumber()) {
+        return value.toNumber();
+    } else {
+        return {};
+    }
+}
+
+inline optional<std::string> toString(const mbgl::android::Value& value) {
+    if (value.isString()) {
+        return value.toString();
+    } else {
+        return {};
+    }
+}
+
+inline optional<Value> toValue(const mbgl::android::Value& value) {
+    if (value.isBool()) {
+        return { value.toBool() };
+    } else if (value.isString()) {
+        return { value.toString() };
+    } else if (value.isNumber()) {
+       return { value.toNumber() };
+    } else {
+        return {};
+    }
+}
+
+} // namespace conversion
+} // namespace style
+} // namespace mbgl