/*******************************************************************
*
*  DESCRIPTION: class Zone
*
*  AUTHOR: Amir Barylko & Jorge Beyoglonian 
*
*  EMAIL: mailto://amir@dc.uba.ar
*         mailto://jbeyoglo@dc.uba.ar
*
*  DATE: 27/6/1998  
*
*******************************************************************/

#ifndef __ZONE_H
#define __ZONE_H

/** include files **/
#include "cellpos.h"
#include "except.h"

/** declarations **/

class ZoneException : public MException
{
protected:
	ZoneException( const string &str = "Invalid String Zone " ): MException( str )
	{} ;
};	// ZoneException


class Zone
{
public:
	Zone( const string &zoneStr )
		{createFrom( zoneStr );}

	struct Iterator
	{
		Iterator()	// default 
			{}
			
		Iterator( const CellPosition &f, const CellPosition &l, const CellPosition &off );
		Iterator( const CellPosition &f, const CellPosition &l );
		Iterator( const Iterator & ) ;

		Iterator &operator =( const Iterator &zoneStr );
			
		Iterator &operator ++(int) ;
		
		const CellPosition &operator *() const
			{ return current; }

		bool operator ==( const Iterator &it ) const
			{ return (current == *it); }

		CellPosition first, last, current ;
	} ;

	Iterator begin()
		{ return Iterator( first, last ); }
	
	Iterator end() ;

	Zone &operator =( const string &zoneStr )
		{ createFrom( zoneStr ); return *this; }

private:
	friend struct Iterator ;
	Zone &createFrom( const string & ) ;

	CellPosition first, last ;

} ; // Zone

#endif // __ZONE_H