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/**
* @file
*
* @brief Demonstrates iteration over the members of an object
*
*/
#include <iostream>
#include <json/json.h>
#include <valijson/adapters/jsoncpp_adapter.hpp>
#include <valijson/utils/jsoncpp_utils.hpp>
using std::cerr;
using std::cout;
using std::endl;
template<typename AdapterType>
void iterateJsonObject(const AdapterType &adapter)
{
if (!adapter.maybeObject()) {
cout << "Not an object." << endl;
return;
}
cout << "Object members:" << endl;
// JSON objects are an unordered collection of key-value pairs,
// so the members of the object may be printed in an order that is
// different to that in the source JSON document.
for (auto member : adapter.asObject()) {
// The key is a std::string that can be accessed using 'first'
cout << " " << member.first << ": ";
// The value is just another Adapter, and can be accessed using 'second'
const AdapterType &value = member.second;
if (value.maybeString()) {
cout << value.asString();
}
cout << endl;
}
}
void usingJsonCppWithTemplateFn(const char *filename)
{
Json::Value value;
if (!valijson::utils::loadDocument(filename, value)) {
return;
}
valijson::adapters::JsonCppAdapter adapter(value);
iterateJsonObject(adapter);
}
int main(int argc, char **argv)
{
if (argc != 2) {
cerr << "Usage: " << endl;
cerr << " " << argv[0] << " <filename>" << endl;
return 1;
}
cout << "-- Object iteration using jsoncpp via template function --" << endl;
usingJsonCppWithTemplateFn(argv[1]);
cout << endl;
return 0;
}
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