manifest.h

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// Manifest.h
//
// $Id: //poco/Main/Foundation/include/Foundation/Manifest.h#5 $
//
// Definition of the Manifest class.
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef Foundation_Manifest_INCLUDED
#define Foundation_Manifest_INCLUDED


#ifndef Foundation_Foundation_INCLUDED
#include "Foundation/Foundation.h"
#endif
#ifndef Foundation_MetaObject_INCLUDED
#include "Foundation/MetaObject.h"
#endif
#ifndef STD_MAP_INCLUDED
#include <map>
#define STD_MAP_INCLUDED
#endif


Foundation_BEGIN


class Foundation_API ManifestBase
	/// ManifestBase is a common base class for
	/// all instantiations of Manifest.
{
public:
	ManifestBase();
	virtual ~ManifestBase();
};


template <class B>
class Manifest: public ManifestBase
	/// A Manifest maintains a list of all classes
	/// contained in a dynamically loadable class
	/// library.
	/// Internally, the information is held
	/// in a map. An iterator is provided to
	/// iterate over all the classes in a Manifest.
{
public:
	typedef AbstractMetaObject<B> Meta;
	typedef std::map<std::string, const Meta*> MetaMap;

	class Iterator
		/// The Manifest's very own iterator class.
	{
	public:
		Iterator(const typename MetaMap::const_iterator& it)
		{
			_it = it;
		}
		Iterator(const Iterator& it)
		{
			_it = it._it;
		}
		~Iterator()
		{
		}
		Iterator& operator = (const Iterator& it)
		{
			_it = it._it;
			return *this;
		}
		inline bool operator == (const Iterator& it) const
		{
			return _it == it._it;
		}
		inline bool operator != (const Iterator& it) const
		{
			return _it != it._it;
		}
		Iterator& operator ++ () // prefix
		{
			++_it;
			return *this;
		}
		Iterator operator ++ (int) // postfix
		{
			Iterator result(_it);
			++_it;
			return result;
		}
		inline const Meta* operator * () const
		{
			return _it->second;
		}
		inline const Meta* operator -> () const
		{
			return _it->second;
		}

	private:
		typename MetaMap::const_iterator _it;
	};

	Manifest()
		/// Creates an empty Manifest.
	{
	}

	virtual ~Manifest()
		/// Destroys the Manifest.
	{
		clear();
	}

	Iterator find(const std::string& className) const
		/// Returns an iterator pointing to the MetaObject
		/// for the given class. If the MetaObject cannot
		/// be found, the iterator points to end().
	{
		return Iterator(_metaMap.find(className));
	}

	Iterator begin() const
	{
		return Iterator(_metaMap.begin());
	}

	Iterator end() const
	{
		return Iterator(_metaMap.end());
	}

	bool insert(const Meta* pMeta)
		/// Inserts a MetaObject. Returns true if insertion
		/// was successful, false if a class with the same
		/// name already exists.
	{
		return _metaMap.insert(typename MetaMap::value_type(pMeta->name(), pMeta)).second;
	}

	void clear()
		/// Removes all MetaObjects from the manifest.
	{
		for (typename MetaMap::iterator it = _metaMap.begin(); it != _metaMap.end(); ++it)
		{
			delete it->second;
		}
		_metaMap.clear();
	}

	int size() const
		/// Returns the number of MetaObjects in the Manifest.
	{
		return int(_metaMap.size());
	}

	bool empty() const
		/// Returns true iff the Manifest does not contain any MetaObjects.
	{
		return _metaMap.empty();
	}

private:
	MetaMap _metaMap;
};


Foundation_END


#endif // Foundation_Manifest_INCLUDED