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diff --git a/storage/mroonga/lib/mrn_condition_converter.hpp b/storage/mroonga/lib/mrn_condition_converter.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2013 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_CONDITION_CONVERTER_HPP_
+#define MRN_CONDITION_CONVERTER_HPP_
+
+#include <mrn_mysql_compat.h>
+
+#include <item_cmpfunc.h>
+
+#include <groonga.h>
+
+namespace mrn {
+  class ConditionConverter {
+  public:
+    ConditionConverter(grn_ctx *ctx, grn_obj *table, bool is_storage_mode);
+    ~ConditionConverter();
+
+    bool is_convertable(const Item *item);
+    unsigned int count_match_against(const Item *item);
+    // caller must check "where" can be convertable by
+    // is_convertable(). This method doesn't validate "where".
+    void convert(const Item *where, grn_obj *expression);
+
+  private:
+    enum NormalizedType {
+      STRING_TYPE,
+      INT_TYPE,
+      TIME_TYPE,
+      UNSUPPORTED_TYPE,
+    };
+
+    grn_ctx *ctx_;
+    grn_obj *table_;
+    bool is_storage_mode_;
+    grn_obj column_name_;
+    grn_obj value_;
+
+    bool is_convertable(const Item_cond *cond_item);
+    bool is_convertable(const Item_func *func_item);
+    bool is_convertable_binary_operation(const Item_field *field_item,
+                                         Item *value_item,
+                                         Item_func::Functype func_type);
+    bool is_convertable_between(const Item_field *field_item,
+                                Item *min_item,
+                                Item *max_item);
+    bool is_valid_time_value(const Item_field *field_item,
+                             Item *value_item);
+    bool get_time_value(const Item_field *field_item,
+                        Item *value_item,
+                        MYSQL_TIME *mysql_time);
+    bool have_index(const Item_field *field_item, grn_operator _operator);
+    bool have_index(const Item_field *field_item, Item_func::Functype func_type);
+
+    NormalizedType normalize_field_type(enum_field_types field_type);
+
+    void convert_binary_operation(const Item_func *func_item,
+                                  grn_obj *expression,
+                                  grn_operator _operator);
+    void convert_between(const Item_func *func_item, grn_obj *expression);
+    void append_field_value(const Item_field *field_item,
+                            grn_obj *expression);
+    void append_const_item(const Item_field *field_item,
+                           Item *const_item,
+                           grn_obj *expression);
+  };
+}
+
+#endif /* MRN_CONDITION_CONVERTER_HPP_ */