ClickHouse/contrib/libpoco/Foundation/include/Poco/Dynamic/Struct.h

564 lines
10 KiB
C++

//
// Struct.h
//
// $Id: //poco/Main/Foundation/include/Poco/Dynamic/Struct.h#9 $
//
// 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 "Poco/Foundation.h"
#include "Poco/Dynamic/Var.h"
#include "Poco/Dynamic/VarHolder.h"
#include "Poco/SharedPtr.h"
#include <map>
#include <set>
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();
}
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