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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 02110-1301 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);
const Item_func *find_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_ */
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