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/************************************************************************************
TerraLib - a library for developing GIS applications.
Copyright © 2001-2007 INPE and Tecgraf/PUC-Rio.

This code is part of the TerraLib library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

You should have received a copy of the GNU Lesser General Public
License along with this library.

The authors reassure the license terms regarding the warranties.
They specifically disclaim any warranties, including, but not limited to,
the implied warranties of merchantability and fitness for a particular purpose.
The library provided hereunder is on an "as is" basis, and the authors have no
obligation to provide maintenance, support, updates, enhancements, or modifications.
In no event shall INPE and Tecgraf / PUC-Rio be held liable to any party for direct,
indirect, special, incidental, or consequential damages arising out of the use
of this library and its documentation.
*************************************************************************************/
/*! \file TeComposite.h
    \brief This file contains definition of composite structures in TerraLib
*/

#ifndef  __TERRALIB_INTERNAL_COMPOSITE_H
#define  __TERRALIB_INTERNAL_COMPOSITE_H

#include "TeCounted.h"

#include <vector>
#include <algorithm>
using namespace std;

//!  Defines a templated class for handling an object built of one single atomic element
template <class T>
class TeSingle
{
public:
	//! Constructor
	TeSingle<T>() {}

	//! Destructor
	virtual ~TeSingle<T>() {}

	//! Copy constructor
	TeSingle<T> ( T& elem ): elem_ ( elem  ) {}

	//! Adds the single element
	void add ( T& elem )
	{	elem_ = elem; }

	//! Returns a referency to the single element
	T&	location ()
	{	return elem_; }

	//! Returns a constant reference to the single element
	const T& location() const
	{
		return elem_;
	}

	//! Returns a referency to the single element
	T&	elem ()
	{	return elem_; }

protected:
	T	elem_;	//!< the single element

};

//! Defines a template for handling a composite object
/*! 
	Provides a vector for storing components and ensures 
	proper destruction of them, by means of a handle/body idiom. 
	Provide a handle to an implementation and thus allow efficient 
	copying of derived objects

	\note This is a specialised example of the "Composite"
	design pattern, with support for the "Bridge" pattern
	(also known as the handle/body idiom).
*/
template <class T>
class TeComposite: public TeCounted
{
public:
	
	using TeCounted::attach;
	using TeCounted::detach;

	//! An iterator to the composite elements 
	typedef typename vector<T>::iterator iterator;
	typedef typename vector<T>::const_iterator const_iterator;

	//! Adds a new component
	void add ( const T& elem )
	{ components_.push_back ( elem ); }

	//! Removes the i-th component
	bool erase ( unsigned int i )
	{ 	
		if ( components_.size() < i )
			return false;
		return ! ( components_.erase ( components_.begin() + i ) == components_.end() );
	}

	//! Removes a specific element 
	/*!
		\param elem the element to be removed
	*/
	bool erase ( T& elem )
	{ 
		typename vector<T>::iterator location = find(components_.begin(),components_.end(), elem);
		if ( location != components_.end())
		{
			components_.erase(location);
			return true;
		}
		else
			return false; 
	}

	//! Removes an element pointed by an iterator
	iterator erase(iterator it)
	{
		return components_.erase(it);
	}

	//! Removes all elements
	void clear ()
	{	components_.clear (); }

	//! Returns the size of the composite
	size_t size() const
	{ return components_.size(); }

	//! Returns the i-th element
	T& operator [] ( int i )
	{ return components_[ i ]; }

	//! Returns TRUE if the composite is empty
	bool empty() const
	{ return components_.empty(); }

	//! Reserves space for n elements (reserve is available for vectors)  
	void reserve(int nelem)
	{ components_.reserve(nelem); }

	//! Returns an iterator to the composite first element
	iterator begin(void)
	{
		return components_.begin();
	}

	//! Returns a iterator to the composite last plus one element
    iterator end(void)
	{
		return components_.end();
	}

	//! A reverse iterator to the composite elements 
	typedef typename vector<T>::reverse_iterator reverse_iterator;

	//! The iterator to the first position in the TeComposite in reverse order
	reverse_iterator rbegin(void) 
	{
		return components_.rbegin();
	}

	//! The iterator to the last plus one position in the TeComposite in reverse order
    reverse_iterator rend(void) 
	{
		return components_.rend();
	}


protected:
	vector<T>	components_; //!< a vector of components
};

#endif