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//
// Object.h
//
// $Id$
//
// Library: JSON
// Package: JSON
// Module: Object
//
// Definition of the Object class.
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef JSON_Object_INCLUDED
#define JSON_Object_INCLUDED
#include "Poco/JSON/JSON.h"
#include "Poco/JSON/Array.h"
#include "Poco/JSON/Stringifier.h"
#include "Poco/SharedPtr.h"
#include "Poco/Dynamic/Var.h"
#include <map>
#include <vector>
#include <deque>
#include <iostream>
#include <sstream>
namespace Poco {
namespace JSON {
class JSON_API Object
/// Represents a JSON object.
{
public:
typedef SharedPtr<Object> Ptr;
Object(bool preserveInsertionOrder = false);
/// Default constructor. If preserveInsertionOrder, object
/// will preserve the items insertion order. Otherwise, items
/// will be sorted by keys.
Object(const Object& copy);
/// Copy constructor
virtual ~Object();
/// Destructor
Dynamic::Var get(const std::string& key) const;
/// Retrieves a property. An empty value is
/// returned when the property doesn't exist.
Array::Ptr getArray(const std::string& key) const;
/// Returns a SharedPtr to an array when the property
/// is an array. An empty SharedPtr is returned when
/// the element doesn't exist or is not an array.
Object::Ptr getObject(const std::string& key) const;
/// Returns a SharedPtr to an object when the property
/// is an object. An empty SharedPtr is returned when
/// the property doesn't exist or is not an object
template<typename T>
T getValue(const std::string& key) const
/// Retrieves the property with the given name and will
/// try to convert the value to the given template type.
/// The convert<T> method of Dynamic is called
/// which can also throw exceptions for invalid values.
/// Note: This will not work for an array or an object.
{
Dynamic::Var value = get(key);
return value.convert<T>();
}
void getNames(std::vector<std::string>& names) const;
/// Returns all property names
bool has(const std::string& key) const;
/// Returns true when the given property exists
bool isArray(const std::string& key) const;
/// Returns true when the given property contains an array
bool isNull(const std::string& key) const;
/// Returns true when the given property contains a null value
bool isObject(const std::string& key) const;
/// Returns true when the given property contains an object
template<typename T>
T optValue(const std::string& key, const T& def) const
/// Returns the value of a property when the property exists
/// and can be converted to the given type. Otherwise
/// def will be returned.
{
T value = def;
ValueMap::const_iterator it = _values.find(key);
if (it != _values.end() && ! it->second.isEmpty() )
{
try
{
value = it->second.convert<T>();
}
catch(...)
{
// The default value will be returned
}
}
return value;
}
std::size_t size() const;
/// Returns the number of properties
void set(const std::string& key, const Dynamic::Var& value);
/// Sets a new value
void stringify(std::ostream& out, unsigned int indent = 0, int step = -1) const;
/// Prints the object to out. When indent is 0, the object
/// will be printed on a single line without indentation.
void remove(const std::string& key);
/// Removes the property with the given key
private:
template <typename C>
void doStringify(const C& container, std::ostream& out, unsigned int indent, int step) const
{
out << '{';
if (indent > 0) out << std::endl;
typename C::const_iterator it = container.begin();
typename C::const_iterator end = container.end();
for (; it != end;)
{
for(int i = 0; i < indent; i++) out << ' ';
out << '"' << getKey(it) << '"';
out << ((indent > 0) ? " : " : ":");
Stringifier::stringify(getValue(it), out, indent + step, step);
if ( ++it != container.end() ) out << ',';
if (step > 0) out << '\n';
}
if (indent >= step) indent -= step;
for (int i = 0; i < indent; i++)
out << ' ';
out << '}';
}
typedef std::map<std::string, Dynamic::Var> ValueMap;
typedef std::deque<Dynamic::Var*> KeyPtrList;
const std::string& getKey(ValueMap::const_iterator& it) const;
const Dynamic::Var& getValue(ValueMap::const_iterator& it) const;
const std::string& getKey(KeyPtrList::const_iterator& it) const;
const Dynamic::Var& getValue(KeyPtrList::const_iterator& it) const;
ValueMap _values;
KeyPtrList _keys;
bool _preserveInsOrder;
};
inline bool Object::has(const std::string& key) const
{
ValueMap::const_iterator it = _values.find(key);
return it != _values.end();
}
inline bool Object::isArray(const std::string& key) const
{
ValueMap::const_iterator it = _values.find(key);
return it != _values.end() && it->second.type() == typeid(Array::Ptr);
}
inline bool Object::isNull(const std::string& key) const
{
ValueMap::const_iterator it = _values.find(key);
return it == _values.end() || it->second.isEmpty();
}
inline bool Object::isObject(const std::string& key) const
{
ValueMap::const_iterator it = _values.find(key);
return it != _values.end() && it->second.type() == typeid(Object::Ptr);
}
inline std::size_t Object::size() const
{
return static_cast<std::size_t>(_values.size());
}
inline void Object::remove(const std::string& key)
{
_values.erase(key);
}
inline const std::string& Object::getKey(ValueMap::const_iterator& it) const
{
return it->first;
}
inline const Dynamic::Var& Object::getValue(ValueMap::const_iterator& it) const
{
return it->second;
}
inline const Dynamic::Var& Object::getValue(KeyPtrList::const_iterator& it) const
{
return **it;
}
}} // Namespace Poco::JSON
namespace Poco {
namespace Dynamic {
template <>
class VarHolderImpl<JSON::Object::Ptr>: public VarHolder
{
public:
VarHolderImpl(const JSON::Object::Ptr& val): _val(val)
{
}
~VarHolderImpl()
{
}
const std::type_info& type() const
{
return typeid(JSON::Object::Ptr);
}
void convert(Int8&) const
{
throw BadCastException();
}
void convert(Int16&) const
{
throw BadCastException();
}
void convert(Int32&) const
{
throw BadCastException();
}
void convert(Int64&) const
{
throw BadCastException();
}
void convert(UInt8&) const
{
throw BadCastException();
}
void convert(UInt16&) const
{
throw BadCastException();
}
void convert(UInt32&) const
{
throw BadCastException();
}
void convert(UInt64&) const
{
throw BadCastException();
}
void convert(bool& value) const
{
value = !_val.isNull() && _val->size() > 0;
}
void convert(float&) const
{
throw BadCastException();
}
void convert(double&) const
{
throw BadCastException();
}
void convert(char&) const
{
throw BadCastException();
}
void convert(std::string& s) const
{
std::ostringstream oss;
_val->stringify(oss, 2);
s = oss.str();
}
void convert(DateTime& /*val*/) const
{
//TODO: val = _val;
throw NotImplementedException("Conversion not implemented: JSON:Object => DateTime");
}
void convert(LocalDateTime& /*ldt*/) const
{
//TODO: ldt = _val.timestamp();
throw NotImplementedException("Conversion not implemented: JSON:Object => LocalDateTime");
}
void convert(Timestamp& /*ts*/) const
{
//TODO: ts = _val.timestamp();
throw NotImplementedException("Conversion not implemented: JSON:Object => Timestamp");
}
VarHolder* clone(Placeholder<VarHolder>* pVarHolder = 0) const
{
return cloneHolder(pVarHolder, _val);
}
const JSON::Object::Ptr& value() const
{
return _val;
}
bool isArray() const
{
return false;
}
bool isInteger() const
{
return false;
}
bool isSigned() const
{
return false;
}
bool isNumeric() const
{
return false;
}
bool isString() const
{
return false;
}
private:
JSON::Object::Ptr _val;
};
}} // namespace Poco::JSON
#endif // JSON_Object_INCLUDED