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403 lines
12 KiB
C++
403 lines
12 KiB
C++
//
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// Struct.h
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//
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// Library: Foundation
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// Package: Dynamic
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// Module: Struct
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//
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// Definition of the Struct 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_Struct_INCLUDED
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#define Foundation_Struct_INCLUDED
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#include <map>
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#include <set>
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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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#include "Poco/SharedPtr.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 Struct
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/// Struct allows to define a named collection of Var objects.
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{
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public:
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typedef typename std::map<K, Var> Data;
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typedef typename std::set<K> NameSet;
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typedef typename Data::iterator Iterator;
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typedef typename Data::const_iterator ConstIterator;
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typedef typename Struct<K>::Data::value_type ValueType;
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typedef typename Struct<K>::Data::size_type SizeType;
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typedef typename std::pair<typename Struct<K>::Iterator, bool> InsRetVal;
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typedef typename Poco::SharedPtr<Struct<K>> Ptr;
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Struct() : _data()
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/// Creates an empty Struct
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{
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}
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Struct(const Data & val) : _data(val)
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/// Creates the Struct from the given value.
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{
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}
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template <typename T>
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Struct(const std::map<K, T> & val)
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{
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typedef typename std::map<K, T>::const_iterator MapConstIterator;
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MapConstIterator it = val.begin();
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MapConstIterator end = val.end();
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for (; it != end; ++it)
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_data.insert(ValueType(it->first, Var(it->second)));
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}
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virtual ~Struct()
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/// Destroys the Struct.
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{
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}
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inline Var & operator[](const K & name)
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/// Returns the Var with the given name, creates an entry if not found.
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{
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return _data[name];
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}
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const Var & operator[](const K & name) const
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/// Returns the Var with the given name, throws a
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/// NotFoundException if the data member is not found.
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{
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ConstIterator it = find(name);
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if (it == end())
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throw NotFoundException(name);
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return it->second;
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}
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inline bool contains(const K & name) const
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/// Returns true if the Struct contains a member with the given name
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{
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return find(name) != end();
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}
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inline Iterator find(const K & name)
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/// Returns an iterator, pointing to the <name,Var> pair containing
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/// the element, or it returns end() if the member was not found
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{
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return _data.find(name);
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}
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inline ConstIterator find(const K & name) const
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/// Returns a const iterator, pointing to the <name,Var> pair containing
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/// the element, or it returns end() if the member was not found
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{
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return _data.find(name);
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}
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inline Iterator end()
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/// Returns the end iterator for the Struct
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{
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return _data.end();
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}
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inline ConstIterator end() const
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/// Returns the end const iterator for the Struct
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{
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return _data.end();
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}
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inline Iterator begin()
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/// Returns the begin iterator for the Struct
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{
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return _data.begin();
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}
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inline ConstIterator begin() const
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/// Returns the begin const iterator for the Struct
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{
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return _data.begin();
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}
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template <typename T>
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inline InsRetVal insert(const K & key, const T & value)
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/// Inserts a <name, Var> pair into the Struct,
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/// returns a pair containing the iterator and a boolean which
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/// indicates success or not (is true, when insert succeeded, false,
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/// when already another element was present, in this case Iterator
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/// points to that other element)
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{
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// fix: SunPro C++ is silly ...
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ValueType valueType(key, value);
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return insert(valueType);
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}
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inline InsRetVal insert(const ValueType & aPair)
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/// Inserts a <name, Var> pair into the Struct,
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/// returns a pair containing the iterator and a boolean which
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/// indicates success or not (is true, when insert succeeded, false,
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/// when already another element was present, in this case Iterator
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/// points to that other element)
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{
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return _data.insert(aPair);
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}
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inline SizeType erase(const K & key)
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/// Erases the element if found, returns number of elements deleted
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{
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return _data.erase(key);
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}
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inline void erase(Iterator & it)
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/// Erases the element at the given position
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{
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_data.erase(it);
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}
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inline bool empty() const
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/// Returns true if the Struct doesn't contain any members
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{
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return _data.empty();
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}
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inline void clear()
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/// Clears the Struct contents
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{
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_data.clear();
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}
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SizeType size() const
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/// Returns the number of members the Struct contains
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{
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return _data.size();
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}
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inline NameSet members() const
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/// Returns a sorted collection containing all member names
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{
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NameSet keys;
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ConstIterator it = begin();
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ConstIterator itEnd = end();
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for (; it != itEnd; ++it)
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keys.insert(it->first);
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return keys;
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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<Struct<std::string>> : public VarHolder
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{
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public:
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VarHolderImpl(const Struct<std::string> & val) : _val(val) { }
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~VarHolderImpl() { }
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const std::type_info & type() const { return typeid(Struct<std::string>); }
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void convert(Int8 &) const { throw BadCastException("Cannot cast Struct type to Int8"); }
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void convert(Int16 &) const { throw BadCastException("Cannot cast Struct type to Int16"); }
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void convert(Int32 &) const { throw BadCastException("Cannot cast Struct type to Int32"); }
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void convert(Int64 &) const { throw BadCastException("Cannot cast Struct type to Int64"); }
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void convert(UInt8 &) const { throw BadCastException("Cannot cast Struct type to UInt8"); }
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void convert(UInt16 &) const { throw BadCastException("Cannot cast Struct type to UInt16"); }
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void convert(UInt32 &) const { throw BadCastException("Cannot cast Struct type to UInt32"); }
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void convert(UInt64 &) const { throw BadCastException("Cannot cast Struct type to UInt64"); }
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void convert(bool &) const { throw BadCastException("Cannot cast Struct type to bool"); }
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void convert(float &) const { throw BadCastException("Cannot cast Struct type to float"); }
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void convert(double &) const { throw BadCastException("Cannot cast Struct type to double"); }
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void convert(char &) const { throw BadCastException("Cannot cast Struct type to char"); }
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void convert(std::string & val) const
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{
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val.append("{ ");
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Struct<std::string>::ConstIterator it = _val.begin();
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Struct<std::string>::ConstIterator itEnd = _val.end();
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if (!_val.empty())
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{
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Var key(it->first);
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Impl::appendJSONKey(val, key);
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val.append(" : ");
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Impl::appendJSONValue(val, it->second);
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++it;
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}
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for (; it != itEnd; ++it)
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{
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val.append(", ");
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Var key(it->first);
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Impl::appendJSONKey(val, key);
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val.append(" : ");
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Impl::appendJSONValue(val, it->second);
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}
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val.append(" }");
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}
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void convert(Poco::DateTime &) const { throw BadCastException("Struct -> Poco::DateTime"); }
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void convert(Poco::LocalDateTime &) const { throw BadCastException("Struct -> Poco::LocalDateTime"); }
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void convert(Poco::Timestamp &) const { throw BadCastException("Struct -> Poco::Timestamp"); }
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VarHolder * clone(Placeholder<VarHolder> * pVarHolder = 0) const { return cloneHolder(pVarHolder, _val); }
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const Struct<std::string> & value() const { return _val; }
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bool isArray() const { return false; }
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bool isStruct() const { return true; }
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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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std::size_t size() const { return _val.size(); }
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Var & operator[](const std::string & name) { return _val[name]; }
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const Var & operator[](const std::string & name) const { return _val[name]; }
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private:
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Struct<std::string> _val;
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};
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template <>
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class VarHolderImpl<Struct<int>> : public VarHolder
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{
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public:
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VarHolderImpl(const Struct<int> & val) : _val(val) { }
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~VarHolderImpl() { }
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const std::type_info & type() const { return typeid(Struct<int>); }
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void convert(Int8 &) const { throw BadCastException("Cannot cast Struct type to Int8"); }
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void convert(Int16 &) const { throw BadCastException("Cannot cast Struct type to Int16"); }
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void convert(Int32 &) const { throw BadCastException("Cannot cast Struct type to Int32"); }
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void convert(Int64 &) const { throw BadCastException("Cannot cast Struct type to Int64"); }
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void convert(UInt8 &) const { throw BadCastException("Cannot cast Struct type to UInt8"); }
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void convert(UInt16 &) const { throw BadCastException("Cannot cast Struct type to UInt16"); }
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void convert(UInt32 &) const { throw BadCastException("Cannot cast Struct type to UInt32"); }
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void convert(UInt64 &) const { throw BadCastException("Cannot cast Struct type to UInt64"); }
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void convert(bool &) const { throw BadCastException("Cannot cast Struct type to bool"); }
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void convert(float &) const { throw BadCastException("Cannot cast Struct type to float"); }
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void convert(double &) const { throw BadCastException("Cannot cast Struct type to double"); }
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void convert(char &) const { throw BadCastException("Cannot cast Struct type to char"); }
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void convert(std::string & val) const
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{
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val.append("{ ");
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Struct<int>::ConstIterator it = _val.begin();
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Struct<int>::ConstIterator itEnd = _val.end();
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if (!_val.empty())
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{
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Var key(it->first);
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Impl::appendJSONKey(val, key);
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val.append(" : ");
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Impl::appendJSONValue(val, it->second);
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++it;
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}
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for (; it != itEnd; ++it)
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{
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val.append(", ");
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Var key(it->first);
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Impl::appendJSONKey(val, key);
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val.append(" : ");
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Impl::appendJSONValue(val, it->second);
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}
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val.append(" }");
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}
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void convert(Poco::DateTime &) const { throw BadCastException("Struct -> Poco::DateTime"); }
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void convert(Poco::LocalDateTime &) const { throw BadCastException("Struct -> Poco::LocalDateTime"); }
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void convert(Poco::Timestamp &) const { throw BadCastException("Struct -> Poco::Timestamp"); }
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VarHolder * clone(Placeholder<VarHolder> * pVarHolder = 0) const { return cloneHolder(pVarHolder, _val); }
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const Struct<int> & value() const { return _val; }
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bool isArray() const { return false; }
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bool isStruct() const { return true; }
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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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std::size_t size() const { return _val.size(); }
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Var & operator[](int name) { return _val[name]; }
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const Var & operator[](int name) const { return _val[name]; }
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private:
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Struct<int> _val;
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};
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} // namespace Dynamic
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typedef Dynamic::Struct<std::string> DynamicStruct;
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} // namespace Poco
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#endif // Foundation_Struct_INCLUDED
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