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1 | // Serialize example |
2 | // This example shows writing JSON string with writer directly. | |
3 | ||
4 | #include "rapidjson/prettywriter.h" // for stringify JSON | |
5 | #include <cstdio> | |
6 | #include <string> | |
7 | #include <vector> | |
8 | ||
9 | using namespace rapidjson; | |
10 | ||
11 | class Person { | |
12 | public: | |
13 | Person(const std::string& name, unsigned age) : name_(name), age_(age) {} | |
14 | Person(const Person& rhs) : name_(rhs.name_), age_(rhs.age_) {} | |
15 | virtual ~Person(); | |
16 | ||
17 | Person& operator=(const Person& rhs) { | |
18 | name_ = rhs.name_; | |
19 | age_ = rhs.age_; | |
20 | return *this; | |
21 | } | |
22 | ||
23 | protected: | |
24 | template <typename Writer> | |
25 | void Serialize(Writer& writer) const { | |
26 | // This base class just write out name-value pairs, without wrapping within an object. | |
27 | writer.String("name"); | |
28 | #if RAPIDJSON_HAS_STDSTRING | |
29 | writer.String(name_); | |
30 | #else | |
31 | writer.String(name_.c_str(), static_cast<SizeType>(name_.length())); // Supplying length of string is faster. | |
32 | #endif | |
33 | writer.String("age"); | |
34 | writer.Uint(age_); | |
35 | } | |
36 | ||
37 | private: | |
38 | std::string name_; | |
39 | unsigned age_; | |
40 | }; | |
41 | ||
42 | Person::~Person() { | |
43 | } | |
44 | ||
45 | class Education { | |
46 | public: | |
47 | Education(const std::string& school, double GPA) : school_(school), GPA_(GPA) {} | |
48 | Education(const Education& rhs) : school_(rhs.school_), GPA_(rhs.GPA_) {} | |
49 | ||
50 | template <typename Writer> | |
51 | void Serialize(Writer& writer) const { | |
52 | writer.StartObject(); | |
53 | ||
54 | writer.String("school"); | |
55 | #if RAPIDJSON_HAS_STDSTRING | |
56 | writer.String(school_); | |
57 | #else | |
58 | writer.String(school_.c_str(), static_cast<SizeType>(school_.length())); | |
59 | #endif | |
60 | ||
61 | writer.String("GPA"); | |
62 | writer.Double(GPA_); | |
63 | ||
64 | writer.EndObject(); | |
65 | } | |
66 | ||
67 | private: | |
68 | std::string school_; | |
69 | double GPA_; | |
70 | }; | |
71 | ||
72 | class Dependent : public Person { | |
73 | public: | |
74 | Dependent(const std::string& name, unsigned age, Education* education = 0) : Person(name, age), education_(education) {} | |
75 | Dependent(const Dependent& rhs) : Person(rhs), education_(0) { education_ = (rhs.education_ == 0) ? 0 : new Education(*rhs.education_); } | |
76 | virtual ~Dependent(); | |
77 | ||
78 | Dependent& operator=(const Dependent& rhs) { | |
79 | if (this == &rhs) | |
80 | return *this; | |
81 | delete education_; | |
82 | education_ = (rhs.education_ == 0) ? 0 : new Education(*rhs.education_); | |
83 | return *this; | |
84 | } | |
85 | ||
86 | template <typename Writer> | |
87 | void Serialize(Writer& writer) const { | |
88 | writer.StartObject(); | |
89 | ||
90 | Person::Serialize(writer); | |
91 | ||
92 | writer.String("education"); | |
93 | if (education_) | |
94 | education_->Serialize(writer); | |
95 | else | |
96 | writer.Null(); | |
97 | ||
98 | writer.EndObject(); | |
99 | } | |
100 | ||
101 | private: | |
102 | ||
103 | Education *education_; | |
104 | }; | |
105 | ||
106 | Dependent::~Dependent() { | |
107 | delete education_; | |
108 | } | |
109 | ||
110 | class Employee : public Person { | |
111 | public: | |
112 | Employee(const std::string& name, unsigned age, bool married) : Person(name, age), dependents_(), married_(married) {} | |
113 | Employee(const Employee& rhs) : Person(rhs), dependents_(rhs.dependents_), married_(rhs.married_) {} | |
114 | virtual ~Employee(); | |
115 | ||
116 | Employee& operator=(const Employee& rhs) { | |
117 | static_cast<Person&>(*this) = rhs; | |
118 | dependents_ = rhs.dependents_; | |
119 | married_ = rhs.married_; | |
120 | return *this; | |
121 | } | |
122 | ||
123 | void AddDependent(const Dependent& dependent) { | |
124 | dependents_.push_back(dependent); | |
125 | } | |
126 | ||
127 | template <typename Writer> | |
128 | void Serialize(Writer& writer) const { | |
129 | writer.StartObject(); | |
130 | ||
131 | Person::Serialize(writer); | |
132 | ||
133 | writer.String("married"); | |
134 | writer.Bool(married_); | |
135 | ||
136 | writer.String(("dependents")); | |
137 | writer.StartArray(); | |
138 | for (std::vector<Dependent>::const_iterator dependentItr = dependents_.begin(); dependentItr != dependents_.end(); ++dependentItr) | |
139 | dependentItr->Serialize(writer); | |
140 | writer.EndArray(); | |
141 | ||
142 | writer.EndObject(); | |
143 | } | |
144 | ||
145 | private: | |
146 | std::vector<Dependent> dependents_; | |
147 | bool married_; | |
148 | }; | |
149 | ||
150 | Employee::~Employee() { | |
151 | } | |
152 | ||
153 | int main(int, char*[]) { | |
154 | std::vector<Employee> employees; | |
155 | ||
156 | employees.push_back(Employee("Milo YIP", 34, true)); | |
157 | employees.back().AddDependent(Dependent("Lua YIP", 3, new Education("Happy Kindergarten", 3.5))); | |
158 | employees.back().AddDependent(Dependent("Mio YIP", 1)); | |
159 | ||
160 | employees.push_back(Employee("Percy TSE", 30, false)); | |
161 | ||
162 | StringBuffer sb; | |
163 | PrettyWriter<StringBuffer> writer(sb); | |
164 | ||
165 | writer.StartArray(); | |
166 | for (std::vector<Employee>::const_iterator employeeItr = employees.begin(); employeeItr != employees.end(); ++employeeItr) | |
167 | employeeItr->Serialize(writer); | |
168 | writer.EndArray(); | |
169 | ||
170 | puts(sb.GetString()); | |
171 | ||
172 | return 0; | |
173 | } |