codec-netcdf: Basic netcdf implementation

1 files changed, 93 insertions, 0 deletions

diff --git a/c++/codec-netcdf/netcdf.h b/c++/codec-netcdf/netcdf.h
new file mode 100644
index 0000000..d579b7f
--- /dev/null
+++ b/c++/codec-netcdf/netcdf.h
@@ -0,0 +1,93 @@
+#pragma once
+
+#include <forstio/core/string_literal.h>
+#include <forstio/core/error.h>
+#include <forstio/codec/codec.h>
+
+#include <netcdf.h>
+
+namespace saw {
+namespace encode {
+/**
+ * Template type hint
+ */
+struct Netcdf {};
+}
+
+/**
+ * Class representing the files system netcdf file
+ */
+template<typename Schema>
+class data<Schema, encode::Netcdf> {
+private:
+		std::string path_;
+public:
+		data(const std::string& path):
+				path_{path}
+		{}
+
+		data(std::string&& path):
+				path_{std::move(path)}
+		{}
+
+		std::string_view get_path_view() {
+				return path_;
+		}
+
+		const std::string& get_path() const {
+				return path_;
+		}
+};
+
+template<typename Schema>
+class codec<Schema, encode::Netcdf>{
+		static_assert(always_false<Schema,encode::Netcdf>, "NetCDF only supports Structs as a root object");
+};
+
+}
+#include "netcdf.tmpl.h"
+namespace saw {
+
+template<typename... Vals, string_literal... Keys>
+class codec<schema::Struct<schema::Member<Vals,Keys>...>, encode::Netcdf> {
+private:
+		using Schema = schema::Struct<schema::Member<Vals,Keys>...>;
+public:
+		SAW_FORBID_COPY(codec);
+		SAW_DEFAULT_MOVE(codec);
+
+		/**
+		 * Default constructor
+		 */
+		codec() = default;
+
+		/**
+		 * Encoder function
+		 */
+		template<typename FromEncoding>
+		error_or<void> encode() {
+				return void_t{};
+		}
+
+		/**
+		 * Decoder function
+		 */
+		template<typename ToEncoding>
+		error_or<void> decode(data<Schema, encode::Netcdf>& from_decode, data<Schema,ToEncoding>& to_decode) {
+				int ncid{};
+				int rc{};
+
+				rc = nc_open(from_decode.get_path().c_str(), NC_NOWRITE, &ncid);
+				if(rc){
+						// Don't know how to get the error, so fail critically.
+						return make_error<err::critical>();
+				}
+
+				auto eov = impl::netcdf_decode<Schema, ToEncoding>::decode(to_decode, ncid);
+
+				nc_close(ncid);
+
+				return eov;
+		}
+};
+}