[core] Reimplement existing caching within an offline-capable database schema

1 files changed, 50 insertions, 0 deletions

diff --git a/platform/default/mbgl/storage/offline_database.hpp b/platform/default/mbgl/storage/offline_database.hpp
new file mode 100644
index 0000000000..bc6f784d50
--- /dev/null
+++ b/platform/default/mbgl/storage/offline_database.hpp
@@ -0,0 +1,50 @@
+#ifndef MBGL_OFFLINE_DATABASE
+#define MBGL_OFFLINE_DATABASE
+
+#include <mbgl/storage/resource.hpp>
+#include <mbgl/util/noncopyable.hpp>
+#include <mbgl/util/optional.hpp>
+
+#include <unordered_map>
+#include <memory>
+#include <string>
+
+namespace mapbox {
+namespace sqlite {
+class Database;
+class Statement;
+}
+}
+
+namespace mbgl {
+
+class Response;
+class TileID;
+
+class OfflineDatabase : private util::noncopyable {
+public:
+    OfflineDatabase(const std::string& path);
+    ~OfflineDatabase();
+
+    optional<Response> get(const Resource&);
+    void put(const Resource&, const Response&);
+
+private:
+    void ensureSchema();
+    void removeExisting();
+    mapbox::sqlite::Statement& getStatement(const char *);
+
+    optional<Response> getTile(const Resource::TileData&);
+    void putTile(const Resource::TileData&, const Response&);
+
+    optional<Response> getResource(const Resource&);
+    void putResource(const Resource&, const Response&);
+
+    const std::string path;
+    std::unique_ptr<::mapbox::sqlite::Database> db;
+    std::unordered_map<const char *, std::unique_ptr<::mapbox::sqlite::Statement>> statements;
+};
+
+} // namespace mbgl
+
+#endif