ClickHouse/base/poco/Foundation/include/Poco/Dynamic/Struct.h

//
// Struct.h
//
// Library: Foundation
// Package: Dynamic
// Module:  Struct
//
// Definition of the Struct class.
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_Struct_INCLUDED
#define Foundation_Struct_INCLUDED


#include <map>
#include <set>
#include "Poco/Dynamic/Var.h"
#include "Poco/Dynamic/VarHolder.h"
#include "Poco/Foundation.h"
#include "Poco/SharedPtr.h"


namespace Poco
{
namespace Dynamic
{


    template <typename K>
    class Struct
    /// Struct allows to define a named collection of Var objects.
    {
    public:
        typedef typename std::map<K, Var> Data;
        typedef typename std::set<K> NameSet;
        typedef typename Data::iterator Iterator;
        typedef typename Data::const_iterator ConstIterator;
        typedef typename Struct<K>::Data::value_type ValueType;
        typedef typename Struct<K>::Data::size_type SizeType;
        typedef typename std::pair<typename Struct<K>::Iterator, bool> InsRetVal;
        typedef typename Poco::SharedPtr<Struct<K>> Ptr;

        Struct() : _data()
        /// Creates an empty Struct
        {
        }

        Struct(const Data & val) : _data(val)
        /// Creates the Struct from the given value.
        {
        }

        template <typename T>
        Struct(const std::map<K, T> & val)
        {
            typedef typename std::map<K, T>::const_iterator MapConstIterator;

            MapConstIterator it = val.begin();
            MapConstIterator end = val.end();
            for (; it != end; ++it)
                _data.insert(ValueType(it->first, Var(it->second)));
        }

        virtual ~Struct()
        /// Destroys the Struct.
        {
        }

        inline Var & operator[](const K & name)
        /// Returns the Var with the given name, creates an entry if not found.
        {
            return _data[name];
        }

        const Var & operator[](const K & name) const
        /// Returns the Var with the given name, throws a
        /// NotFoundException if the data member is not found.
        {
            ConstIterator it = find(name);
            if (it == end())
                throw NotFoundException(name);
            return it->second;
        }

        inline bool contains(const K & name) const
        /// Returns true if the Struct contains a member with the given name
        {
            return find(name) != end();
        }

        inline Iterator find(const K & name)
        /// Returns an iterator, pointing to the <name,Var> pair containing
        /// the element, or it returns end() if the member was not found
        {
            return _data.find(name);
        }

        inline ConstIterator find(const K & name) const
        /// Returns a const iterator, pointing to the <name,Var> pair containing
        /// the element, or it returns end() if the member was not found
        {
            return _data.find(name);
        }

        inline Iterator end()
        /// Returns the end iterator for the Struct
        {
            return _data.end();
        }

        inline ConstIterator end() const
        /// Returns the end const iterator for the Struct
        {
            return _data.end();
        }

        inline Iterator begin()
        /// Returns the begin iterator for the Struct
        {
            return _data.begin();
        }

        inline ConstIterator begin() const
        /// Returns the begin const iterator for the Struct
        {
            return _data.begin();
        }

        template <typename T>
        inline InsRetVal insert(const K & key, const T & value)
        /// Inserts a <name, Var> pair into the Struct,
        /// returns a pair containing the iterator and a boolean which
        /// indicates success or not (is true, when insert succeeded, false,
        /// when already another element was present, in this case Iterator
        /// points to that other element)
        {
            // fix: SunPro C++ is silly ...
            ValueType valueType(key, value);
            return insert(valueType);
        }

        inline InsRetVal insert(const ValueType & aPair)
        /// Inserts a <name, Var> pair into the Struct,
        /// returns a pair containing the iterator and a boolean which
        /// indicates success or not (is true, when insert succeeded, false,
        /// when already another element was present, in this case Iterator
        /// points to that other element)
        {
            return _data.insert(aPair);
        }

        inline SizeType erase(const K & key)
        /// Erases the element if found, returns number of elements deleted
        {
            return _data.erase(key);
        }

        inline void erase(Iterator & it)
        /// Erases the element at the given position
        {
            _data.erase(it);
        }

        inline bool empty() const
        /// Returns true if the Struct doesn't contain any members
        {
            return _data.empty();
        }

        inline void clear()
        /// Clears the Struct contents
        {
            _data.clear();
        }

        SizeType size() const
        /// Returns the number of members the Struct contains
        {
            return _data.size();
        }

        inline NameSet members() const
        /// Returns a sorted collection containing all member names
        {
            NameSet keys;
            ConstIterator it = begin();
            ConstIterator itEnd = end();
            for (; it != itEnd; ++it)
                keys.insert(it->first);
            return keys;
        }

        std::string toString()
        {
            std::string str;
            Var(*this).convert<std::string>(str);
            return str;
        }

    private:
        Data _data;
    };


    template <>
    class VarHolderImpl<Struct<std::string>> : public VarHolder
    {
    public:
        VarHolderImpl(const Struct<std::string> & val) : _val(val) { }

        ~VarHolderImpl() { }

        const std::type_info & type() const { return typeid(Struct<std::string>); }

        void convert(Int8 &) const { throw BadCastException("Cannot cast Struct type to Int8"); }

        void convert(Int16 &) const { throw BadCastException("Cannot cast Struct type to Int16"); }

        void convert(Int32 &) const { throw BadCastException("Cannot cast Struct type to Int32"); }

        void convert(Int64 &) const { throw BadCastException("Cannot cast Struct type to Int64"); }

        void convert(UInt8 &) const { throw BadCastException("Cannot cast Struct type to UInt8"); }

        void convert(UInt16 &) const { throw BadCastException("Cannot cast Struct type to UInt16"); }

        void convert(UInt32 &) const { throw BadCastException("Cannot cast Struct type to UInt32"); }

        void convert(UInt64 &) const { throw BadCastException("Cannot cast Struct type to UInt64"); }

        void convert(bool &) const { throw BadCastException("Cannot cast Struct type to bool"); }

        void convert(float &) const { throw BadCastException("Cannot cast Struct type to float"); }

        void convert(double &) const { throw BadCastException("Cannot cast Struct type to double"); }

        void convert(char &) const { throw BadCastException("Cannot cast Struct type to char"); }

        void convert(std::string & val) const
        {
            val.append("{ ");
            Struct<std::string>::ConstIterator it = _val.begin();
            Struct<std::string>::ConstIterator itEnd = _val.end();
            if (!_val.empty())
            {
                Var key(it->first);
                Impl::appendJSONKey(val, key);
                val.append(" : ");
                Impl::appendJSONValue(val, it->second);
                ++it;
            }
            for (; it != itEnd; ++it)
            {
                val.append(", ");
                Var key(it->first);
                Impl::appendJSONKey(val, key);
                val.append(" : ");
                Impl::appendJSONValue(val, it->second);
            }
            val.append(" }");
        }

        void convert(Poco::DateTime &) const { throw BadCastException("Struct -> Poco::DateTime"); }

        void convert(Poco::LocalDateTime &) const { throw BadCastException("Struct -> Poco::LocalDateTime"); }

        void convert(Poco::Timestamp &) const { throw BadCastException("Struct -> Poco::Timestamp"); }

        VarHolder * clone(Placeholder<VarHolder> * pVarHolder = 0) const { return cloneHolder(pVarHolder, _val); }

        const Struct<std::string> & value() const { return _val; }

        bool isArray() const { return false; }

        bool isStruct() const { return true; }

        bool isInteger() const { return false; }

        bool isSigned() const { return false; }

        bool isNumeric() const { return false; }

        bool isString() const { return false; }

        std::size_t size() const { return _val.size(); }

        Var & operator[](const std::string & name) { return _val[name]; }

        const Var & operator[](const std::string & name) const { return _val[name]; }

    private:
        Struct<std::string> _val;
    };


    template <>
    class VarHolderImpl<Struct<int>> : public VarHolder
    {
    public:
        VarHolderImpl(const Struct<int> & val) : _val(val) { }

        ~VarHolderImpl() { }

        const std::type_info & type() const { return typeid(Struct<int>); }

        void convert(Int8 &) const { throw BadCastException("Cannot cast Struct type to Int8"); }

        void convert(Int16 &) const { throw BadCastException("Cannot cast Struct type to Int16"); }

        void convert(Int32 &) const { throw BadCastException("Cannot cast Struct type to Int32"); }

        void convert(Int64 &) const { throw BadCastException("Cannot cast Struct type to Int64"); }

        void convert(UInt8 &) const { throw BadCastException("Cannot cast Struct type to UInt8"); }

        void convert(UInt16 &) const { throw BadCastException("Cannot cast Struct type to UInt16"); }

        void convert(UInt32 &) const { throw BadCastException("Cannot cast Struct type to UInt32"); }

        void convert(UInt64 &) const { throw BadCastException("Cannot cast Struct type to UInt64"); }

        void convert(bool &) const { throw BadCastException("Cannot cast Struct type to bool"); }

        void convert(float &) const { throw BadCastException("Cannot cast Struct type to float"); }

        void convert(double &) const { throw BadCastException("Cannot cast Struct type to double"); }

        void convert(char &) const { throw BadCastException("Cannot cast Struct type to char"); }

        void convert(std::string & val) const
        {
            val.append("{ ");
            Struct<int>::ConstIterator it = _val.begin();
            Struct<int>::ConstIterator itEnd = _val.end();
            if (!_val.empty())
            {
                Var key(it->first);
                Impl::appendJSONKey(val, key);
                val.append(" : ");
                Impl::appendJSONValue(val, it->second);
                ++it;
            }
            for (; it != itEnd; ++it)
            {
                val.append(", ");
                Var key(it->first);
                Impl::appendJSONKey(val, key);
                val.append(" : ");
                Impl::appendJSONValue(val, it->second);
            }
            val.append(" }");
        }

        void convert(Poco::DateTime &) const { throw BadCastException("Struct -> Poco::DateTime"); }

        void convert(Poco::LocalDateTime &) const { throw BadCastException("Struct -> Poco::LocalDateTime"); }

        void convert(Poco::Timestamp &) const { throw BadCastException("Struct -> Poco::Timestamp"); }

        VarHolder * clone(Placeholder<VarHolder> * pVarHolder = 0) const { return cloneHolder(pVarHolder, _val); }

        const Struct<int> & value() const { return _val; }

        bool isArray() const { return false; }

        bool isStruct() const { return true; }

        bool isInteger() const { return false; }

        bool isSigned() const { return false; }

        bool isNumeric() const { return false; }

        bool isString() const { return false; }

        std::size_t size() const { return _val.size(); }

        Var & operator[](int name) { return _val[name]; }

        const Var & operator[](int name) const { return _val[name]; }

    private:
        Struct<int> _val;
    };


} // namespace Dynamic


typedef Dynamic::Struct<std::string> DynamicStruct;


} // namespace Poco


#endif // Foundation_Struct_INCLUDED