1 /*
2    Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
3 
4    This program is free software; you can redistribute it and/or modify
5    it under the terms of the GNU General Public License, version 2.0,
6    as published by the Free Software Foundation.
7 
8    This program is also distributed with certain software (including
9    but not limited to OpenSSL) that is licensed under separate terms,
10    as designated in a particular file or component or in included license
11    documentation.  The authors of MySQL hereby grant you an additional
12    permission to link the program and your derivative works with the
13    separately licensed software that they have included with MySQL.
14 
15    This program is distributed in the hope that it will be useful,
16    but WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18    GNU General Public License, version 2.0, for more details.
19 
20    You should have received a copy of the GNU General Public License
21    along with this program; if not, write to the Free Software
22    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
23  */
24 
25 #ifndef NdbInfoRecAttr_H
26 #define NdbInfoRecAttr_H
27 
28 class NdbInfoRecAttr {
29 public:
ptr() const30   const void* ptr() const {
31     assert(m_requested);
32     return m_data;
33   }
34 
u_32_value() const35   Uint32 u_32_value() const {
36     assert(m_requested);
37     assert(m_len == sizeof(Uint32));
38     return *((const Uint32 *) m_data);
39   }
40 
u_64_value() const41   Uint64 u_64_value() const {
42     Uint64 val;
43     assert(m_requested);
44     assert(m_len == sizeof(Uint64));
45     memcpy(&val, m_data, sizeof(Uint64));
46     return val;
47   }
48 
c_str() const49   const char* c_str() const {
50     assert(m_requested);
51     assert(m_len > 0);
52     return m_data;
53   }
54 
length() const55   Uint32 length() const {
56     assert(m_requested);
57     return m_len;
58   }
59 
isNULL() const60   bool isNULL() const {
61     assert(m_requested);
62     return !m_defined;
63   }
64 
65 private:
66   friend class NdbInfoRecAttrCollection;
NdbInfoRecAttr()67   NdbInfoRecAttr() :
68     m_data(NULL),
69     m_len(0),
70     m_defined(false),
71     m_requested(false)
72   {}
~NdbInfoRecAttr()73   ~NdbInfoRecAttr()
74   {}
75 
76   const char* m_data;
77   Uint32 m_len;
78   bool m_defined;
79   bool m_requested;
80 };
81 
82 
83 // Fixed size collection of NdbInfoRecAttr
84 class NdbInfoRecAttrCollection {
85 public:
86   NdbInfoRecAttrCollection(); // Not implemented
87   NdbInfoRecAttrCollection(const NdbInfoRecAttrCollection&); // Not implemented
88 
NdbInfoRecAttrCollection(unsigned count)89   NdbInfoRecAttrCollection(unsigned count) :
90     m_attr_count(count)
91   {
92     m_attrs = new NdbInfoRecAttr[count];
93   }
94 
~NdbInfoRecAttrCollection()95   ~NdbInfoRecAttrCollection()
96   {
97     delete[] m_attrs;
98   }
99 
get_value(unsigned idx)100   const NdbInfoRecAttr* get_value(unsigned idx)
101   {
102     assert(idx < m_attr_count);
103     NdbInfoRecAttr* attr = &m_attrs[idx];
104     attr->m_requested = true;
105     return attr;
106   }
107 
is_requested(unsigned idx) const108   bool is_requested(unsigned idx) const
109   {
110     assert(idx < m_attr_count);
111     return m_attrs[idx].m_requested;
112   }
113 
set_recattr(unsigned idx,const char * data,Uint32 len) const114   void set_recattr(unsigned idx,
115                    const char* data,
116                    Uint32 len) const
117   {
118     assert(idx < m_attr_count);
119     NdbInfoRecAttr* attr = &m_attrs[idx];
120 
121     attr->m_data = data;
122     attr->m_len = len;
123     attr->m_defined = true;
124   }
125 
reset_recattrs(void) const126   void reset_recattrs(void) const
127   {
128     for (unsigned i = 0; i < m_attr_count; i++)
129     {
130       m_attrs[i].m_defined = false;
131     }
132   }
133 
134 private:
135   const unsigned m_attr_count;
136   NdbInfoRecAttr* m_attrs;
137 };
138 
139 #endif
140