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