1/* -*- c-basic-offset: 2 -*- */
2/*
3 Copyright(C) 2013 Kouhei Sutou <kou@clear-code.com>
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18*/
19
20#ifndef MRN_CONDITION_CONVERTER_HPP_
21#define MRN_CONDITION_CONVERTER_HPP_
22
23#include <mrn_mysql_compat.h>
24
25#include <item_cmpfunc.h>
26
27#include <groonga.h>
28
29namespace mrn {
30 class ConditionConverter {
31 public:
32 ConditionConverter(grn_ctx *ctx, grn_obj *table, bool is_storage_mode);
33 ~ConditionConverter();
34
35 bool is_convertable(const Item *item);
36 unsigned int count_match_against(const Item *item);
37 // caller must check "where" can be convertable by
38 // is_convertable(). This method doesn't validate "where".
39 void convert(const Item *where, grn_obj *expression);
40
41 private:
42 enum NormalizedType {
43 STRING_TYPE,
44 INT_TYPE,
45 TIME_TYPE,
46 UNSUPPORTED_TYPE,
47 };
48
49 grn_ctx *ctx_;
50 grn_obj *table_;
51 bool is_storage_mode_;
52 grn_obj column_name_;
53 grn_obj value_;
54
55 bool is_convertable(const Item_cond *cond_item);
56 bool is_convertable(const Item_func *func_item);
57 bool is_convertable_binary_operation(const Item_field *field_item,
58 Item *value_item,
59 Item_func::Functype func_type);
60 bool is_convertable_between(const Item_field *field_item,
61 Item *min_item,
62 Item *max_item);
63 bool is_valid_time_value(const Item_field *field_item,
64 Item *value_item);
65 bool get_time_value(const Item_field *field_item,
66 Item *value_item,
67 MYSQL_TIME *mysql_time);
68 bool have_index(const Item_field *field_item, grn_operator _operator);
69 bool have_index(const Item_field *field_item, Item_func::Functype func_type);
70
71 NormalizedType normalize_field_type(enum_field_types field_type);
72
73 void convert_binary_operation(const Item_func *func_item,
74 grn_obj *expression,
75 grn_operator _operator);
76 void convert_between(const Item_func *func_item, grn_obj *expression);
77 void append_field_value(const Item_field *field_item,
78 grn_obj *expression);
79 void append_const_item(const Item_field *field_item,
80 Item *const_item,
81 grn_obj *expression);
82 };
83}
84
85#endif /* MRN_CONDITION_CONVERTER_HPP_ */
86