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Data/include/Poco/Data/Binding.h

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+//
+// Binding.h
+//
+// $Id: //poco/Main/Data/include/Poco/Data/Binding.h#4 $
+//
+// 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