ClickHouse/contrib/libpoco/Foundation/include/Poco/Dynamic/Pair.h
2016-06-07 11:23:15 +03:00

415 lines
6.9 KiB
C++

//
// Pair.h
//
// $Id: //poco/Main/Foundation/include/Poco/Dynamic/Pair.h#9 $
//
// Library: Foundation
// Package: Dynamic
// Module: Pair
//
// Definition of the Pair class.
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_Pair_INCLUDED
#define Foundation_Pair_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Dynamic/Var.h"
#include "Poco/Dynamic/VarHolder.h"
#include <utility>
namespace Poco {
namespace Dynamic {
template <typename K>
class Pair
/// Pair allows to define a pair of values.
{
public:
typedef typename std::pair<K, Var> Data;
Pair(): _data()
/// Creates an empty Pair
{
}
Pair(const Pair& other): _data(other._data)
/// Creates the Pair from another pair.
{
}
Pair(const Data& val): _data(val)
/// Creates the Pair from the given value.
{
}
template <typename T>
Pair(const std::pair<K, T>& val): _data(std::make_pair(val.first, val.second))
/// Creates Pair form standard pair.
{
}
template <typename T>
Pair(const K& first, const T& second): _data(std::make_pair(first, second))
/// Creates pair from two values.
{
}
virtual ~Pair()
/// Destroys the Pair.
{
}
Pair& swap(Pair& other)
/// Swaps the content of the two Pairs.
{
std::swap(_data, other._data);
return *this;
}
Pair& operator = (const Pair& other)
/// Copy constructs Pair from another pair.
{
Pair(other).swap(*this);
return *this;
}
inline const K& first() const
/// Returns the first member of the pair.
{
return _data.first;
}
inline const Var& second() const
/// Returns the second member of the pair.
{
return _data.second;
}
std::string toString()
{
std::string str;
Var(*this).convert<std::string>(str);
return str;
}
private:
Data _data;
};
template <>
class VarHolderImpl<Pair<std::string> >: public VarHolder
{
public:
VarHolderImpl(const Pair<std::string>& val): _val(val)
{
}
~VarHolderImpl()
{
}
const std::type_info& type() const
{
return typeid(Pair<std::string>);
}
void convert(Int8& val) const
{
throw BadCastException("Cannot cast Pair type to Int8");
}
void convert(Int16& val) const
{
throw BadCastException("Cannot cast Pair type to Int16");
}
void convert(Int32& val) const
{
throw BadCastException("Cannot cast Pair type to Int32");
}
void convert(Int64& val) const
{
throw BadCastException("Cannot cast Pair type to Int64");
}
void convert(UInt8& val) const
{
throw BadCastException("Cannot cast Pair type to UInt8");
}
void convert(UInt16& val) const
{
throw BadCastException("Cannot cast Pair type to UInt16");
}
void convert(UInt32& val) const
{
throw BadCastException("Cannot cast Pair type to UInt32");
}
void convert(UInt64& val) const
{
throw BadCastException("Cannot cast Pair type to UInt64");
}
void convert(bool& val) const
{
throw BadCastException("Cannot cast Pair type to bool");
}
void convert(float& val) const
{
throw BadCastException("Cannot cast Pair type to float");
}
void convert(double& val) const
{
throw BadCastException("Cannot cast Pair type to double");
}
void convert(char& val) const
{
throw BadCastException("Cannot cast Pair type to char");
}
void convert(std::string& val) const
{
// Serialize in JSON format: equals an object
// JSON format definition: { string ':' value } string:value pair n-times, sep. by ','
val.append("{ ");
Var key(_val.first());
Impl::appendJSONKey(val, key);
val.append(" : ");
Impl::appendJSONValue(val, _val.second());
val.append(" }");
}
void convert(Poco::DateTime&) const
{
throw BadCastException("Pair -> Poco::DateTime");
}
void convert(Poco::LocalDateTime&) const
{
throw BadCastException("Pair -> Poco::LocalDateTime");
}
void convert(Poco::Timestamp&) const
{
throw BadCastException("Pair -> Poco::Timestamp");
}
VarHolder* clone(Placeholder<VarHolder>* pVarHolder = 0) const
{
return cloneHolder(pVarHolder, _val);
}
const Pair<std::string>& value() const
{
return _val;
}
bool isArray() const
{
return false;
}
bool isStruct() const
{
return false;
}
bool isInteger() const
{
return false;
}
bool isSigned() const
{
return false;
}
bool isNumeric() const
{
return false;
}
bool isString() const
{
return false;
}
private:
Pair<std::string> _val;
};
template <>
class VarHolderImpl<Pair<int> >: public VarHolder
{
public:
VarHolderImpl(const Pair<int>& val): _val(val)
{
}
~VarHolderImpl()
{
}
const std::type_info& type() const
{
return typeid(Pair<int>);
}
void convert(Int8& val) const
{
throw BadCastException("Cannot cast Pair type to Int8");
}
void convert(Int16& val) const
{
throw BadCastException("Cannot cast Pair type to Int16");
}
void convert(Int32& val) const
{
throw BadCastException("Cannot cast Pair type to Int32");
}
void convert(Int64& val) const
{
throw BadCastException("Cannot cast Pair type to Int64");
}
void convert(UInt8& val) const
{
throw BadCastException("Cannot cast Pair type to UInt8");
}
void convert(UInt16& val) const
{
throw BadCastException("Cannot cast Pair type to UInt16");
}
void convert(UInt32& val) const
{
throw BadCastException("Cannot cast Pair type to UInt32");
}
void convert(UInt64& val) const
{
throw BadCastException("Cannot cast Pair type to UInt64");
}
void convert(bool& val) const
{
throw BadCastException("Cannot cast Pair type to bool");
}
void convert(float& val) const
{
throw BadCastException("Cannot cast Pair type to float");
}
void convert(double& val) const
{
throw BadCastException("Cannot cast Pair type to double");
}
void convert(char& val) const
{
throw BadCastException("Cannot cast Pair type to char");
}
void convert(std::string& val) const
{
// Serialize in JSON format: equals an object
// JSON format definition: { string ':' value } string:value pair n-times, sep. by ','
val.append("{ ");
Var key(_val.first());
Impl::appendJSONKey(val, key);
val.append(" : ");
Impl::appendJSONValue(val, _val.second());
val.append(" }");
}
void convert(Poco::DateTime&) const
{
throw BadCastException("Pair -> Poco::DateTime");
}
void convert(Poco::LocalDateTime&) const
{
throw BadCastException("Pair -> Poco::LocalDateTime");
}
void convert(Poco::Timestamp&) const
{
throw BadCastException("Pair -> Poco::Timestamp");
}
VarHolder* clone(Placeholder<VarHolder>* pVarHolder = 0) const
{
return cloneHolder(pVarHolder, _val);
}
const Pair<int>& value() const
{
return _val;
}
bool isArray() const
{
return false;
}
bool isStruct() const
{
return false;
}
bool isInteger() const
{
return false;
}
bool isSigned() const
{
return false;
}
bool isNumeric() const
{
return false;
}
bool isString() const
{
return false;
}
private:
Pair<int> _val;
};
} // namespace Dynamic
} // namespace Poco
#endif // Foundation_Pair_INCLUDED