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a627774 Mar 3, 2016
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@miloyip @drewnoakes
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// Serialize example
// This example shows writing JSON string with writer directly.
#include "rapidjson/prettywriter.h" // for stringify JSON
#include <cstdio>
#include <string>
#include <vector>
using namespace rapidjson;
class Person {
public:
Person(const std::string& name, unsigned age) : name_(name), age_(age) {}
Person(const Person& rhs) : name_(rhs.name_), age_(rhs.age_) {}
virtual ~Person();
Person& operator=(const Person& rhs) {
name_ = rhs.name_;
age_ = rhs.age_;
return *this;
}
protected:
template <typename Writer>
void Serialize(Writer& writer) const {
// This base class just write out name-value pairs, without wrapping within an object.
writer.String("name");
#if RAPIDJSON_HAS_STDSTRING
writer.String(name_);
#else
writer.String(name_.c_str(), static_cast<SizeType>(name_.length())); // Supplying length of string is faster.
#endif
writer.String("age");
writer.Uint(age_);
}
private:
std::string name_;
unsigned age_;
};
Person::~Person() {
}
class Education {
public:
Education(const std::string& school, double GPA) : school_(school), GPA_(GPA) {}
Education(const Education& rhs) : school_(rhs.school_), GPA_(rhs.GPA_) {}
template <typename Writer>
void Serialize(Writer& writer) const {
writer.StartObject();
writer.String("school");
#if RAPIDJSON_HAS_STDSTRING
writer.String(school_);
#else
writer.String(school_.c_str(), static_cast<SizeType>(school_.length()));
#endif
writer.String("GPA");
writer.Double(GPA_);
writer.EndObject();
}
private:
std::string school_;
double GPA_;
};
class Dependent : public Person {
public:
Dependent(const std::string& name, unsigned age, Education* education = 0) : Person(name, age), education_(education) {}
Dependent(const Dependent& rhs) : Person(rhs), education_(0) { education_ = (rhs.education_ == 0) ? 0 : new Education(*rhs.education_); }
virtual ~Dependent();
Dependent& operator=(const Dependent& rhs) {
if (this == &rhs)
return *this;
delete education_;
education_ = (rhs.education_ == 0) ? 0 : new Education(*rhs.education_);
return *this;
}
template <typename Writer>
void Serialize(Writer& writer) const {
writer.StartObject();
Person::Serialize(writer);
writer.String("education");
if (education_)
education_->Serialize(writer);
else
writer.Null();
writer.EndObject();
}
private:
Education *education_;
};
Dependent::~Dependent() {
delete education_;
}
class Employee : public Person {
public:
Employee(const std::string& name, unsigned age, bool married) : Person(name, age), dependents_(), married_(married) {}
Employee(const Employee& rhs) : Person(rhs), dependents_(rhs.dependents_), married_(rhs.married_) {}
virtual ~Employee();
Employee& operator=(const Employee& rhs) {
static_cast<Person&>(*this) = rhs;
dependents_ = rhs.dependents_;
married_ = rhs.married_;
return *this;
}
void AddDependent(const Dependent& dependent) {
dependents_.push_back(dependent);
}
template <typename Writer>
void Serialize(Writer& writer) const {
writer.StartObject();
Person::Serialize(writer);
writer.String("married");
writer.Bool(married_);
writer.String(("dependents"));
writer.StartArray();
for (std::vector<Dependent>::const_iterator dependentItr = dependents_.begin(); dependentItr != dependents_.end(); ++dependentItr)
dependentItr->Serialize(writer);
writer.EndArray();
writer.EndObject();
}
private:
std::vector<Dependent> dependents_;
bool married_;
};
Employee::~Employee() {
}
int main(int, char*[]) {
std::vector<Employee> employees;
employees.push_back(Employee("Milo YIP", 34, true));
employees.back().AddDependent(Dependent("Lua YIP", 3, new Education("Happy Kindergarten", 3.5)));
employees.back().AddDependent(Dependent("Mio YIP", 1));
employees.push_back(Employee("Percy TSE", 30, false));
StringBuffer sb;
PrettyWriter<StringBuffer> writer(sb);
writer.StartArray();
for (std::vector<Employee>::const_iterator employeeItr = employees.begin(); employeeItr != employees.end(); ++employeeItr)
employeeItr->Serialize(writer);
writer.EndArray();
puts(sb.GetString());
return 0;
}