Feat/add sqllite to cpp pipeline (#206)

pipeline/src/services/sqlite/build_location_key.cc

@@ -0,0 +1,28 @@
+/**
+ * @file services/sqlite/build_location_key.cc
+ * @brief SqliteExportService::BuildLocationKey() implementation.
+ */
+
+#include <iomanip>
+#include <sstream>
+
+#include "services/sqlite_export_service.h"
+#include "services/sqlite_export_service_helpers.h"
+
+constexpr int kLocationPrecision = 17;
+
+std::string SqliteExportService::BuildLocationKey(const Location& location) {
+  std::ostringstream key_stream;
+  key_stream << location.city << '\n'
+             << location.state_province << '\n'
+             << location.iso3166_2 << '\n'
+             << location.country << '\n'
+             << location.iso3166_1 << '\n'
+             << std::setprecision(kLocationPrecision) << location.latitude
+             << '\n'
+             << std::setprecision(kLocationPrecision) << location.longitude
+             << '\n'
+             << sqlite_export_service_internal::SerializeLocalLanguages(
+                    location.local_languages);
+  return key_stream.str();
+}