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/*! 
	@file : CObject.cpp 
	Contains the implementation of class CObject. 
 
	@author Sarmad Kh. Abdulla 
*/ 
//------------------------------------------------------------------------------ 
 
 
//////////////////////////////////////////////////////////////////////////////// 
// Header files 
#include "stdafx.h" 
 
 
/*! 
 * Initializes the link tree variables of this object 
 * 
 * @param none 
 * 
 * @return  :  
 */ 
CObject::CObject() 
{ 
	pFirstChild = NULL; 
	pLastChild = NULL; 
	pPrevSibling = NULL; 
	pNextSibling = NULL; 
	pOwner = NULL; 
} 
 
 
/*! 
 * Removes the object from the tree by detaching it from its parent and detaching all 
 * the childs of this object. 
 * 
 * @param none 
 * 
 * @return  :  
 */ 
CObject::~CObject() 
{ 
	// detaches all the childs 
	while( pFirstChild ) DetachChild( *pFirstChild ); 
 
	// detaches this object from it's parent 
	if( pOwner ) 
		pOwner->DetachChild( *this ); 
} 
 
 
/*! 
 * Attaches a child object to this object. 
 * 
 * @param object : A reference to the child object to attach. 
 * 
 * @return void  :  
 */ 
void CObject::AttachChild( CObject & object ) 
{ 
	if( object.pOwner ) 
		object.pOwner->DetachChild( object ); 
 
	object.pPrevSibling = pLastChild; 
	object.pNextSibling = NULL; 
	if( pLastChild ) 
		pLastChild->pNextSibling = &object; 
	if( !pFirstChild ) 
		pFirstChild = &object; 
	pLastChild = &object; 
	object.pOwner = this; 
} 
 
 
/*! 
 * Detaches a child object from this object. 
 * 
 * @param object : A reference to the child object to detach. 
 * 
 * @return void  :  
 */ 
void CObject::DetachChild( CObject & object ) 
{ 
	if( object.pPrevSibling ) 
		object.pPrevSibling->pNextSibling = object.pNextSibling; 
	if( object.pNextSibling ) 
		object.pNextSibling->pPrevSibling = object.pPrevSibling; 
	if( !object.pPrevSibling ) 
		pFirstChild = object.pNextSibling; 
	if( !object.pNextSibling ) 
		pLastChild = object.pPrevSibling; 
	object.pPrevSibling = NULL; 
	object.pNextSibling = NULL; 
	object.pOwner = NULL; 
} 
 
 
/*! 
 * Delete all the childs attached to this object 
 * 
 * @param void :  
 * 
 * @return void  :  
 */ 
void CObject::DeleteChilds( void ) 
{ 
	CObject * pobj = GetFirstChild(); 
	while( pobj ) 
	{ 
		pobj->DeleteChilds(); 
		delete pobj; 
		pobj = GetFirstChild(); 
	} 
}