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#include "definitions.h"
#include "List.h"
Cell::Cell()
{
item_ = NULL;
next_ = NULL;
prev_ = NULL;
}
Cell::Cell(Linkable *new_item)
{
item_ = new_item;
next_ = NULL;
prev_ = NULL;
}
Cell::Cell(Linkable *new_item, Cell *prev)
{
item_ = new_item;
prev_ = prev;
next_ = NULL;
}
Cell::Cell(Linkable *new_item, Cell *next, Cell *prev)
{
item_ = new_item;
next_ = next;
prev_ = prev;
}
Cell::~Cell()
{
next_ = NULL;
prev_ = NULL;
item_ = NULL;
}
Linkable* Cell::item(){return item_;}
Cell* Cell::next(){return next_;}
Cell* Cell::prev(){return prev_;}
void Cell::set_next(Cell *next) {next_ = next;}
void Cell::set_prev(Cell *prev) {next_ = prev;}
/*----------------------------------------------------*/
List::List()
{
head_ = NULL;
tail_ = NULL;
old_search_val_ = NULL;
}
List::~List()
{
Cell* ptr = head_;
Cell* tmp;
while(ptr != NULL)
{
tmp = ptr->next();
delete ptr;
ptr = tmp;
}
head_ = NULL;
tail_ = NULL;
old_search_val_ = NULL;
}
/* Simply add to the beginning of the list */
void List::insert(Linkable* new_item)
{
add_first(new_item);
}
/* Add to the end of the list */
void List::add_last(Linkable *new_item)
{
Cell* tmp;
if ((tail_ == NULL) && (head_ == NULL))
{
/* The list is empty */
tmp = new Cell(new_item);
tail_ =tmp;
head_ = tmp;
return;
}
else if ((tail_ != NULL) && (head_ != NULL))
{
tmp = new Cell(new_item , tail_);
tail_->set_next(tmp);
tail_ = tmp;
return;
}
else
{
printf("Error in List obj\n");
}
}
/* Add to the beginning of the list */
void List::add_first(Linkable *new_item)
{
Cell *tmp;
if ((tail_ == NULL) && (head_ == NULL))
{
/* The list is empty */
tmp = new Cell(new_item);
head_ = tmp;
tail_ = tmp;
return;
}
else if ((tail_ != NULL) && (head_ != NULL))
{
tmp = new Cell(new_item, head_);
head_ = tmp;
return;
}
else
{
printf("Error in List obj\n");
}
}
/* Remove the item from the List */
void List::remove(Linkable *new_item)
{
Cell *ptr = head_, *prev, *next;
while (ptr)
{
if (ptr->item()==new_item)
{
prev = ptr->prev();
next = ptr->next();
if ((prev != NULL) && (next != NULL))
{
prev->set_next(next);
next->set_prev(prev);
delete ptr;
}
else if (prev != NULL)
{
/* ptr must be the last item */
prev->set_next(NULL);
tail_ = prev;
delete ptr;
}
else if (next != NULL)
{
/* ptr must be the first item */
next->set_prev(NULL);
head_ = next;
delete ptr;
}
else
{
head_ = tail_ = NULL;
delete ptr;
}
return;
}
else ptr = ptr->next();
}
}
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