aboutsummaryrefslogtreecommitdiff
path: root/odb/relational/common.hxx
blob: 9bd2da66b3a3ce827d782a0056a191b34587cf94 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
// file      : odb/relational/common.hxx
// copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
// license   : GNU GPL v3; see accompanying LICENSE file

#ifndef ODB_RELATIONAL_COMMON_HXX
#define ODB_RELATIONAL_COMMON_HXX

#include <set>
#include <cassert>

#include <odb/common.hxx>
#include <odb/relational/context.hxx>

namespace relational
{
  struct member_base: traversal::data_member, virtual context
  {
    typedef member_base base;

    member_base (semantics::type* type,
                 const custom_cxx_type* ct,
                 string const& fq_type,
                 string const& key_prefix,
                 object_section* section = 0)
        : type_override_ (type),
          custom_override_ (ct),
          fq_type_override_ (fq_type),
          key_prefix_ (key_prefix),
          section_ (section)
    {
    }

    member_base (string const& var,
                 semantics::type* type,
                 const custom_cxx_type* ct,
                 string const& fq_type,
                 string const& key_prefix,
                 object_section* section = 0)
        : var_override_ (var),
          type_override_ (type),
          custom_override_ (ct),
          fq_type_override_ (fq_type),
          key_prefix_ (key_prefix),
          section_ (section)
    {
    }

  protected:
    // For virtual inheritance only. Should not be actually called.
    //
    member_base ();

  protected:
    string var_override_;
    semantics::type* type_override_;
    const custom_cxx_type* custom_override_;
    string fq_type_override_;
    string key_prefix_;
    object_section* section_;
  };

  // Template argument is the database SQL type (sql_type).
  //
  template <typename T>
  struct member_base_impl: virtual member_base
  {
    typedef member_base_impl base_impl;

    member_base_impl (base const& x): base (x) {}

  protected:
    member_base_impl () {}

  public:
    virtual T const&
    member_sql_type (semantics::data_member&) = 0;

    virtual void
    traverse (semantics::data_member&);

    struct member_info
    {
      semantics::data_member& m; // Member.
      semantics::type& t;        // Cvr-unqualified member C++ type, note
                                 // that m.type () may not be the same as t.
      const custom_cxx_type* ct; // Translation used for t, if any.
      semantics::class_* ptr;    // Pointed-to object if m is an object
                                 // pointer. In this case t is the id type
                                 // while fq_type_ is the pointer fq-type.
      semantics::type* wrapper;  // Wrapper type if member is a composite or
                                 // container wrapper, also cvr-unqualified.
                                 // In this case t is the wrapped type.
      bool cq;                   // True if the original (wrapper) type
                                 // is const-qualified.
      T const* st;               // Member SQL type (only simple values).
      string& var;               // Member variable name with trailing '_'.

      // C++ type fq-name.
      //
      string
      fq_type (bool unwrap = true) const
      {
        semantics::names* hint;

        if (wrapper != 0 && unwrap)
        {
          // Use the hint from the wrapper unless the wrapped type
          // is qualified.
          //
          hint = wrapper->get<semantics::names*> ("wrapper-hint");
          utype (*context::wrapper (*wrapper), hint);
          return t.fq_name (hint);
        }

        // Use the original type from 'm' instead of 't' since the hint may
        // be invalid for a different type. Plus, if a type is overriden,
        // then the fq_type must be as well.
        //
        if (ptr != 0)
        {
          semantics::type& t (utype (*id_member (*ptr), hint));
          return t.fq_name (hint);
        }
        else if (fq_type_.empty ())
        {
          semantics::type& t (utype (m, hint));
          return t.fq_name (hint);
        }
        else
          // If we are translated, then fq_type_ contains the original type.
          //
          return ct == 0 ? fq_type_ : t.fq_name (ct->as_hint);
      }

      string
      ptr_fq_type () const
      {
        assert (ptr != 0);

        if (fq_type_.empty ())
        {
          // If type is overridden so should fq_type so it is safe to
          // get the type from the member.
          //
          semantics::names* hint;
          semantics::type& t (utype (m, hint));
          return t.fq_name (hint);
        }
        else
          return fq_type_;
      }

      string const& fq_type_;

      member_info (semantics::data_member& m_,
                   semantics::type& t_,
                   const custom_cxx_type* ct_,
                   semantics::type* wrapper_,
                   bool cq_,
                   string& var_,
                   string const& fq_type)
          : m (m_),
            t (t_),
            ct (ct_),
            ptr (0),
            wrapper (wrapper_),
            cq (cq_),
            st (0),
            var (var_),
            fq_type_ (fq_type)
      {
      }
    };

    bool
    container (member_info& mi)
    {
      // This cannot be a container if we have a type override.
      //
      return type_override_ == 0 && context::container (mi.m);
    }

    // The false return value indicates that no further callbacks
    // should be called for this member.
    //
    virtual bool
    pre (member_info&) {return true;}

    virtual void
    post (member_info&) {}

    virtual void
    traverse_composite (member_info&) {}

    virtual void
    traverse_container (member_info&) {}

    // Note that by default traverse_pointer() will traverse the
    // pointed-to object id type.
    //
    virtual void
    traverse_pointer (member_info&);

    virtual void
    traverse_simple (member_info&) {}
  };

  //
  //
  struct member_image_type: virtual member_base
  {
    typedef member_image_type base;

    member_image_type (): member_base (0, 0, string (), string ()) {}

    member_image_type (semantics::type* type,
                       const custom_cxx_type* ct,
                       string const& fq_type = string (),
                       string const& key_prefix = string ())
        : member_base (type, ct, fq_type, key_prefix) {}

    // Has to be overriden.
    //
    virtual string
    image_type (semantics::data_member&);
  };

  //
  //
  struct member_database_type_id: virtual member_base
  {
    typedef member_database_type_id base;

    member_database_type_id (): member_base (0, 0, string (), string ()) {}
    member_database_type_id (semantics::type* type,
                             const custom_cxx_type* ct,
                             string const& fq_type = string (),
                             string const& key_prefix = string ())
        : member_base (type, ct, fq_type, key_prefix) {}

    // Has to be overriden.
    //
    virtual string
    database_type_id (semantics::data_member&);
  };
}

#include <odb/relational/common.txx>

// Other common parts.
//
#include <odb/relational/common-query.hxx>

#endif // ODB_RELATIONAL_COMMON_HXX