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diff --git a/storage/mroonga/lib/mrn_field_normalizer.hpp b/storage/mroonga/lib/mrn_field_normalizer.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2013-2015 Kouhei Sutou <kou@clear-code.com>
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
+*/
+
+#ifndef MRN_FIELD_NORMALIZER_HPP_
+#define MRN_FIELD_NORMALIZER_HPP_
+
+#include <mrn_mysql.h>
+#include <mrn_mysql_compat.h>
+
+#include <groonga.h>
+
+namespace mrn {
+  class FieldNormalizer {
+  public:
+    FieldNormalizer(grn_ctx *ctx, THD *thread, Field *field);
+    ~FieldNormalizer();
+
+    bool should_normalize();
+    grn_obj *normalize(const char *string, unsigned int string_length);
+    grn_obj *find_grn_normalizer();
+
+  private:
+    grn_ctx *ctx_;
+    THD *thread_;
+    Field *field_;
+
+    bool is_text_type();
+  };
+}
+
+#endif // MRN_FIELD_NORMALIZER_HPP_