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#ifndef CEPH_JSON_H
#define CEPH_JSON_H
#include <iostream>
#include <include/types.h>
#include <list>
#include "json_spirit/json_spirit.h"
#include "Formatter.h"
using namespace json_spirit;
class JSONObj;
class JSONObjIter {
typedef map<string, JSONObj *>::iterator map_iter_t;
map_iter_t cur;
map_iter_t last;
public:
JSONObjIter();
~JSONObjIter();
void set(const JSONObjIter::map_iter_t &_cur, const JSONObjIter::map_iter_t &_end);
void operator++();
JSONObj *operator*();
bool end() {
return (cur == last);
}
};
class JSONObj
{
JSONObj *parent;
protected:
string name; // corresponds to obj_type in XMLObj
Value data;
string data_string;
multimap<string, JSONObj *> children;
map<string, string> attr_map;
void handle_value(Value v);
public:
JSONObj() : parent(NULL){};
virtual ~JSONObj();
void init(JSONObj *p, Value v, string n);
string& get_name() { return name; }
string& get_data() { return data_string; }
bool get_data(const string& key, string *dest);
JSONObj *get_parent();
void add_child(string el, JSONObj *child);
bool get_attr(string name, string& attr);
JSONObjIter find(const string& name);
JSONObjIter find_first();
JSONObjIter find_first(const string& name);
JSONObj *find_obj(const string& name);
friend ostream& operator<<(ostream& out, JSONObj& obj); // does not work, FIXME
bool is_array();
bool is_object();
vector<string> get_array_elements();
};
class JSONParser : public JSONObj
{
int buf_len;
string json_buffer;
bool success;
public:
JSONParser();
virtual ~JSONParser();
void handle_data(const char *s, int len);
bool parse(const char *buf_, int len);
bool parse(int len);
bool parse();
bool parse(const char *file_name);
const char *get_json() { return json_buffer.c_str(); }
void set_failure() { success = false; }
};
class JSONDecoder {
public:
struct err {
string message;
err(const string& m) : message(m) {}
};
JSONParser parser;
JSONDecoder(bufferlist& bl) {
if (!parser.parse(bl.c_str(), bl.length())) {
cout << "JSONDecoder::err()" << std::endl;
throw JSONDecoder::err("failed to parse JSON input");
}
}
template<class T>
static bool decode_json(const char *name, T& val, JSONObj *obj, bool mandatory = false);
template<class T>
static void decode_json(const char *name, T& val, T& default_val, JSONObj *obj);
};
template<class T>
void decode_json_obj(T& val, JSONObj *obj)
{
val.decode_json(obj);
}
static inline void decode_json_obj(string& val, JSONObj *obj)
{
val = obj->get_data();
}
void decode_json_obj(unsigned long& val, JSONObj *obj);
void decode_json_obj(long& val, JSONObj *obj);
void decode_json_obj(unsigned& val, JSONObj *obj);
void decode_json_obj(int& val, JSONObj *obj);
void decode_json_obj(bool& val, JSONObj *obj);
template<class T>
void decode_json_obj(list<T>& l, JSONObj *obj)
{
JSONObjIter iter = obj->find_first();
for (; !iter.end(); ++iter) {
T val;
JSONObj *o = *iter;
decode_json_obj(val, o);
l.push_back(val);
}
}
template<class T>
bool JSONDecoder::decode_json(const char *name, T& val, JSONObj *obj, bool mandatory)
{
JSONObjIter iter = obj->find_first(name);
if (iter.end()) {
if (mandatory) {
string s = "missing mandatory field " + string(name);
throw err(s);
}
return false;
}
try {
decode_json_obj(val, *iter);
} catch (err& e) {
string s = string(name) + ": ";
s.append(e.message);
throw err(s);
}
return true;
}
template<class T>
void JSONDecoder::decode_json(const char *name, T& val, T& default_val, JSONObj *obj)
{
JSONObjIter iter = obj->find_first(name);
if (iter.end()) {
val = default_val;
return;
}
try {
decode_json_obj(val, *iter);
} catch (err& e) {
val = default_val;
string s = string(name) + ": ";
s.append(e.message);
throw err(s);
}
}
template<class T>
static void encode_json(const char *name, const T& val, Formatter *f)
{
f->open_object_section(name);
val.dump(f);
f->close_section();
}
template<class T>
static void encode_json(const char *name, const std::list<T>& l, Formatter *f)
{
f->open_array_section(name);
for (typename std::list<T>::const_iterator iter = l.begin(); iter != l.end(); ++iter) {
f->open_object_section("obj");
encode_json(name, *iter, f);
f->close_section();
}
f->close_section();
}
#endif
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