<commit_before>/**
 * @file
 *
 * @brief
 *
 * @copyright BSD License (see LICENSE.md or https://www.libelektra.org)
 */

#ifndef ELEKTRA_KDBVALUE_HPP
#define ELEKTRA_KDBVALUE_HPP

#include <kdbconfig.h>

#include <algorithm>
#include <cassert>
#include <fstream>
#include <functional>
#include <iostream>
#include <kdbmeta.h>
#include <map>
#include <memory>
#include <set>
#include <stdexcept>
#include <string>
#include <unordered_map>
#include <vector>

#include <kdbproposal.h>
#include <keyset.hpp>

// #include <kdbprivate.h> // for debugging (to see values of internal structures)

namespace kdb
{


// some widely used interfaces

/**
 * @brief This type is being used as bottom type that always fails.
 */
class none_t
{
};

template <>
inline void Key::set (none_t)
{
}

template <>
inline none_t Key::get () const
{
	none_t ret;
	return ret;
}


/**
 * @brief Base class for all layers.
 */
class Layer
{
public:
	virtual std::string id () const = 0;
	virtual std::string operator() () const = 0;
};

/**
 * @brief Everything implementing this interface can be used as layer
 *
 * Different from "Layer" objects they will not be constructed on activation
 * but instead only the WrapLayer will be constructed and the wrapped object
 * will be passed along by reference.
 *
 * @note the lifetime must be beyond layer deactivation!
 */
class Wrapped
{
public:
	virtual std::string layerId () const = 0;
	virtual std::string layerVal () const = 0;
};

class WrapLayer : public Layer
{
public:
	explicit WrapLayer (Wrapped const & wrapped) : m_wrapped (wrapped)
	{
	}

	virtual std::string id () const
	{
		return m_wrapped.layerId ();
	}

	virtual std::string operator() () const
	{
		return m_wrapped.layerVal ();
	}

private:
	Wrapped const & m_wrapped;
};

class KeyValueLayer : public kdb::Layer
{
public:
	KeyValueLayer (std::string key, std::string value) : m_key (std::move (key)), m_value (std::move (value))
	{
	}
	std::string id () const override
	{
		return m_key;
	}
	std::string operator() () const override
	{
		return m_value;
	}

private:
	std::string m_key;
	std::string m_value;
};

/**
 * @brief Base class for values to be observed.
 *
 * updateContext() is called whenever a context tells a value that it
 * should reevaluate its name and update its cache.
 */
class ValueObserver
{
public:
	virtual ~ValueObserver () = 0;
	virtual void updateContext (bool write = true) const = 0;
	virtual kdb::Key getDepKey () const = 0;

	typedef std::reference_wrapper<ValueObserver> reference;
};

/**
 * @brief Needed to put a ValueObserver in a map
 *
 * @return Comparision result
 */
inline bool operator< (ValueObserver const & lhs, ValueObserver const & rhs)
{
	return &lhs < &rhs;
}

inline ValueObserver::~ValueObserver ()
{
}


class ValueSubject
{
public:
	virtual void notifyInThread () = 0;
};

/**
 * @brief Used by contexts for callbacks (to run code using a mutex).
 *
 * Following scenarios are possible:
 * !oldName && !newName: execute code, do nothing else
 * !oldName && newName: attach
 * oldName && newName: reattach
 * oldName == newName: assignment, attach for inter-thread updates
 * oldName && !newName: detach
 */
struct Command
{
public:
	typedef std::pair<std::string, std::string> Pair;
	/**
	 * @brief Typedef for function that returs oldKey, newKey pair
	 */
	typedef std::function<Pair ()> Func;
	Command (ValueSubject const & v_, Func & execute_, bool hasChanged_ = false)<commit_msg>KDB Value: Fix minor spelling mistakes<commit_after>/**
 * @file
 *
 * @brief
 *
 * @copyright BSD License (see LICENSE.md or https://www.libelektra.org)
 */

#ifndef ELEKTRA_KDBVALUE_HPP
#define ELEKTRA_KDBVALUE_HPP

#include <kdbconfig.h>

#include <algorithm>
#include <cassert>
#include <fstream>
#include <functional>
#include <iostream>
#include <kdbmeta.h>
#include <map>
#include <memory>
#include <set>
#include <stdexcept>
#include <string>
#include <unordered_map>
#include <vector>

#include <kdbproposal.h>
#include <keyset.hpp>

// #include <kdbprivate.h> // for debugging (to see values of internal structures)

namespace kdb
{


// some widely used interfaces

/**
 * @brief This type is being used as bottom type that always fails.
 */
class none_t
{
};

template <>
inline void Key::set (none_t)
{
}

template <>
inline none_t Key::get () const
{
	none_t ret;
	return ret;
}


/**
 * @brief Base class for all layers.
 */
class Layer
{
public:
	virtual std::string id () const = 0;
	virtual std::string operator() () const = 0;
};

/**
 * @brief Everything implementing this interface can be used as layer
 *
 * Different from "Layer" objects they will not be constructed on activation
 * but instead only the WrapLayer will be constructed and the wrapped object
 * will be passed along by reference.
 *
 * @note the lifetime must be beyond layer deactivation!
 */
class Wrapped
{
public:
	virtual std::string layerId () const = 0;
	virtual std::string layerVal () const = 0;
};

class WrapLayer : public Layer
{
public:
	explicit WrapLayer (Wrapped const & wrapped) : m_wrapped (wrapped)
	{
	}

	virtual std::string id () const
	{
		return m_wrapped.layerId ();
	}

	virtual std::string operator() () const
	{
		return m_wrapped.layerVal ();
	}

private:
	Wrapped const & m_wrapped;
};

class KeyValueLayer : public kdb::Layer
{
public:
	KeyValueLayer (std::string key, std::string value) : m_key (std::move (key)), m_value (std::move (value))
	{
	}
	std::string id () const override
	{
		return m_key;
	}
	std::string operator() () const override
	{
		return m_value;
	}

private:
	std::string m_key;
	std::string m_value;
};

/**
 * @brief Base class for values to be observed.
 *
 * updateContext() is called whenever a context tells a value that it
 * should reevaluate its name and update its cache.
 */
class ValueObserver
{
public:
	virtual ~ValueObserver () = 0;
	virtual void updateContext (bool write = true) const = 0;
	virtual kdb::Key getDepKey () const = 0;

	typedef std::reference_wrapper<ValueObserver> reference;
};

/**
 * @brief Needed to put a ValueObserver in a map
 *
 * @return Comparison result
 */
inline bool operator< (ValueObserver const & lhs, ValueObserver const & rhs)
{
	return &lhs < &rhs;
}

inline ValueObserver::~ValueObserver ()
{
}


class ValueSubject
{
public:
	virtual void notifyInThread () = 0;
};

/**
 * @brief Used by contexts for callbacks (to run code using a mutex).
 *
 * Following scenarios are possible:
 * !oldName && !newName: execute code, do nothing else
 * !oldName && newName: attach
 * oldName && newName: reattach
 * oldName == newName: assignment, attach for inter-thread updates
 * oldName && !newName: detach
 */
struct Command
{
public:
	typedef std::pair<std::string, std::string> Pair;
	/**
	 * @brief Typedef for function that returns oldKey, newKey pair
	 */
	typedef std::function<Pair ()> Func;
	Command (ValueSubject const & v_, Func & execute_, bool hasChanged_ = false)
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