text: //
  // Binding.h
  //
  // $Id: //poco/1.3/Data/include/Poco/Data/Binding.h#1 $
  //
  // Library: Data
  // Package: DataCore
  // Module:  Binding
  //
  // Definition of the Binding class.
  //
  // Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // Permission is hereby granted, free of charge, to any person or organization
  // obtaining a copy of the software and accompanying documentation covered by
  // this license (the "Software") to use, reproduce, display, distribute,
  // execute, and transmit the Software, and to prepare derivative works of the
  // Software, and to permit third-parties to whom the Software is furnished to
  // do so, all subject to the following:
  // 
  // The copyright notices in the Software and this entire statement, including
  // the above license grant, this restriction and the following disclaimer,
  // must be included in all copies of the Software, in whole or in part, and
  // all derivative works of the Software, unless such copies or derivative
  // works are solely in the form of machine-executable object code generated by
  // a source language processor.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  // DEALINGS IN THE SOFTWARE.
  //
  
  
  #ifndef Data_Binding_INCLUDED
  #define Data_Binding_INCLUDED
  
  
  #include "Poco/Data/Data.h"
  #include "Poco/Data/AbstractBinding.h"
  #include "Poco/Data/DataException.h"
  #include "Poco/Data/TypeHandler.h"
  #include <set>
  #include <vector>
  #include <map>
  #include <cstddef>
  
  
  namespace Poco {
  namespace Data {
  
  
  template <class T>
  class Binding: public AbstractBinding
  	/// A Binding maps a value to a column.
  {
  public:
  	explicit Binding(const T& val): _val(val), _bound(false)
  		/// Creates the Binding.
  	{
  	}
  
  	~Binding()
  		/// Destroys the Binding.
  	{
  	}
  
  	std::size_t numOfColumnsHandled() const
  	{
  		return TypeHandler<T>::size();
  	}
  
  	std::size_t numOfRowsHandled() const
  	{
  		return 1;
  	}
  
  	bool canBind() const
  	{
  		return !_bound;
  	}
  
  	void bind(std::size_t pos)
  	{
  		poco_assert_dbg(getBinder() != 0);
  		TypeHandler<T>::bind(pos, _val, getBinder());
  		_bound = true;
  	}
  
  	void reset ()
  	{
  		_bound = false;
  	}
  
  private:
  	const T& _val;
  	bool     _bound;
  };
  
  
  template <class T>
  class Binding<std::vector<T> >: public AbstractBinding
  	/// Specialization for std::vector.
  {
  public:
  	explicit Binding(const std::vector<T>& val): _val(val), _begin(val.begin()), _end(val.end())
  		/// Creates the Binding.
  	{
  		if (numOfRowsHandled() == 0)
  			throw BindingException("It is illegal to bind to an empty data collection");
  	}
  
  	~Binding()
  		/// Destroys the Binding.
  	{
  	}
  
  	std::size_t numOfColumnsHandled() const
  	{
  		return TypeHandler<T>::size();
  	}
  
  	std::size_t numOfRowsHandled() const
  	{
  		return _val.size();
  	}
  
  	bool canBind() const
  	{
  		return _begin != _end;
  	}
  
  	void bind(std::size_t pos)
  	{
  		poco_assert_dbg(getBinder() != 0);
  		poco_assert_dbg(canBind());
  		TypeHandler<T>::bind(pos, *_begin, getBinder());
  		++_begin;
  	}
  
  	void reset()
  	{
  		_begin = _val.begin();
  		_end   = _val.end();
  	}
  
  private:
  	const std::vector<T>&                   _val;
  	typename std::vector<T>::const_iterator _begin;
  	typename std::vector<T>::const_iterator _end;
  };
  
  
  template <class T>
  class Binding<std::set<T> >: public AbstractBinding
  	/// Specialization for std::set.
  {
  public:
  	explicit Binding(const std::set<T>& val): AbstractBinding(), _val(val), _begin(val.begin()), _end(val.end())
  		/// Creates the Binding.
  	{
  		if (numOfRowsHandled() == 0)
  			throw BindingException("It is illegal to bind to an empty data collection");
  	}
  
  	~Binding()
  		/// Destroys the Binding.
  	{
  	}
  
  	std::size_t numOfColumnsHandled() const
  	{
  		return TypeHandler<T>::size();
  	}
  
  	std::size_t numOfRowsHandled() const
  	{
  		return _val.size();
  	}
  
  	bool canBind() const
  	{
  		return _begin != _end;
  	}
  
  	void bind(std::size_t pos)
  	{
  		poco_assert_dbg(getBinder() != 0);
  		poco_assert_dbg(canBind());
  		TypeHandler<T>::bind(pos, *_begin, getBinder());
  		++_begin;
  	}
  
  	void reset()
  	{
  		_begin = _val.begin();
  		_end   = _val.end();
  	}
  
  private:
  	const std::set<T>&                   _val;
  	typename std::set<T>::const_iterator _begin;
  	typename std::set<T>::const_iterator _end;
  };
  
  
  template <class T>
  class Binding<std::multiset<T> >: public AbstractBinding
  	/// Specialization for std::multiset.
  {
  public:
  	explicit Binding(const std::multiset<T>& val): AbstractBinding(), _val(val), _begin(val.begin()), _end(val.end())
  		/// Creates the Binding.
  	{
  		if (numOfRowsHandled() == 0)
  			throw BindingException("It is illegal to bind to an empty data collection");
  	}
  
  	~Binding()
  		/// Destroys the Binding.
  	{
  	}
  
  	std::size_t numOfColumnsHandled() const
  	{
  		return TypeHandler<T>::size();
  	}
  
  	std::size_t numOfRowsHandled() const
  	{
  		return _val.size();
  	}
  
  	bool canBind() const
  	{
  		return _begin != _end;
  	}
  
  	void bind(std::size_t pos)
  	{
  		poco_assert_dbg(getBinder() != 0);
  		poco_assert_dbg(canBind());
  		TypeHandler<T>::bind(pos, *_begin, getBinder());
  		++_begin;
  	}
  
  	void reset()
  	{
  		_begin = _val.begin();
  		_end   = _val.end();
  	}
  
  private:
  	const std::multiset<T>&                   _val;
  	typename std::multiset<T>::const_iterator _begin;
  	typename std::multiset<T>::const_iterator _end;
  };
  
  
  template <class K, class V>
  class Binding<std::map<K, V> >: public AbstractBinding
  	/// Specialization for std::map.
  {
  public:
  	explicit Binding(const std::map<K, V>& val): AbstractBinding(), _val(val), _begin(val.begin()), _end(val.end())
  		/// Creates the Binding.
  	{
  		if (numOfRowsHandled() == 0)
  			throw BindingException("It is illegal to bind to an empty data collection");
  	}
  
  	~Binding()
  		/// Destroys the Binding.
  	{
  	}
  
  	std::size_t numOfColumnsHandled() const
  	{
  		return TypeHandler<V>::size();
  	}
  
  	std::size_t numOfRowsHandled() const
  	{
  		return _val.size();
  	}
  
  	bool canBind() const
  	{
  		return _begin != _end;
  	}
  
  	void bind(std::size_t pos)
  	{
  		poco_assert_dbg(getBinder() != 0);
  		poco_assert_dbg(canBind());
  		TypeHandler<V>::bind(pos, _begin->second, getBinder());
  		++_begin;
  	}
  
  	void reset()
  	{
  		_begin = _val.begin();
  		_end   = _val.end();
  	}
  
  private:
  	const std::map<K, V>&                   _val;
  	typename std::map<K, V>::const_iterator _begin;
  	typename std::map<K, V>::const_iterator _end;
  };
  
  
  template <class K, class V>
  class Binding<std::multimap<K, V> >: public AbstractBinding
  	/// Specialization for std::multimap.
  {
  public:
  	explicit Binding(const std::multimap<K, V>& val): AbstractBinding(), _val(val), _begin(val.begin()), _end(val.end())
  		/// Creates the Binding.
  	{
  		if (numOfRowsHandled() == 0)
  			throw BindingException("It is illegal to bind to an empty data collection");
  	}
  
  	~Binding()
  		/// Destroys the Binding.
  	{
  	}
  
  	std::size_t numOfColumnsHandled() const
  	{
  		return TypeHandler<V>::size();
  	}
  
  	std::size_t numOfRowsHandled() const
  	{
  		return _val.size();
  	}
  
  	bool canBind() const
  	{
  		return _begin != _end;
  	}
  
  	void bind(std::size_t pos)
  	{
  		poco_assert_dbg(getBinder() != 0);
  		poco_assert_dbg(canBind());
  		TypeHandler<V>::bind(pos, _begin->second, getBinder());
  		++_begin;
  	}
  
  	void reset()
  	{
  		_begin = _val.begin();
  		_end   = _val.end();
  	}
  
  private:
  	const std::multimap<K, V>&                   _val;
  	typename std::multimap<K, V>::const_iterator _begin;
  	typename std::multimap<K, V>::const_iterator _end;
  };
  
  
  template <typename T> Binding<T>* use(const T& t)
  	/// Convenience function for a more compact Binding creation.
  {
  	return new Binding<T>(t);
  }
  
  
  } } // namespace Poco::Data
  
  
  #endif // Data_Binding_INCLUDED
  