void *
Coll_List_popBack(
Coll_List *_this)
{
Coll_Iter *element_to_remove;
void *object = NULL;
assert(_this);
element_to_remove = _this->_last_element;
if (element_to_remove){
object = Coll_Iter_getObject(element_to_remove);
/* detach element from linked list */
_this->_last_element = Coll_Iter_getPrev(element_to_remove);
if (_this->_last_element){
Coll_Iter_setNext(_this->_last_element, NULL);
} else {
_this->_first_element = NULL;
}
_this->_nr_elements--;
/* delete the element */
Coll_Iter_delete(element_to_remove);
}
return object;
}
/* but sometimes you are just into italian food... */
void*
Coll_Set_remove(
Coll_Set *_this,
void *object)
{
void* returnVal = NULL;
Coll_Iter *iter;
Coll_Iter *prev;
Coll_Iter *next;
DLRL_INFO_OBJECT(INF_ENTER);
assert(_this);
/* object may be null */
iter = Coll_Set_find(_this, object);
if (iter){
returnVal = Coll_Iter_getObject(iter);
prev = Coll_Iter_getPrev(iter);
next = Coll_Iter_getNext(iter);
/* delink the found element from the set */
if (prev){
Coll_Iter_setNext(prev, next);
}
if (next){
Coll_Iter_setPrev(next, prev);
}
/* update set administration */
if (iter == _this->_first_element){
_this->_first_element = next;
}
if (iter == _this->_last_element){
_this->_last_element = prev;
}
_this->_nr_elements--;
/* Free element */
Coll_Iter_delete(iter);
}
DLRL_INFO(INF_EXIT);
return returnVal;
}
long
Coll_Set_add(
Coll_Set *_this,
void *object)
{
long retValue;
Coll_Iter *new_element;
DLRL_INFO_OBJECT(INF_ENTER);
assert(_this);
/* object may be null */
if (!_this->_is_sorted && !Coll_Set_find(_this, object)){
/* set is unsorted and does not contain the to be added object => the object can be added as a unique object */
retValue = Coll_Set_addUniqueObject(_this, object);
} else {
/* set is sorted, add the object at the right place */
new_element = Coll_Iter_new();
if (!new_element){
retValue = COLL_ERROR_ALLOC;
} else {
Coll_Iter_setObject(new_element, object);
if ( (_this->_nr_elements == 0) || (_this->_isLess(object, Coll_Iter_getObject(_this->_first_element) ) ) ){
/* first object to insert */
Coll_Iter_setNext(new_element, _this->_first_element);
if (_this->_first_element){
Coll_Iter_setPrev(_this->_first_element, new_element);
}
_this->_first_element = new_element;
/* update set administration */
_this->_nr_elements++;
} else {
int ready = 0;
/* insert object at the right place */
Coll_Iter *iter = _this->_first_element;
while (!ready) {
int isLess = _this->_isLess(object, Coll_Iter_getObject(iter));
if ( !(isLess || _this->_isLess(Coll_Iter_getObject(iter), object)) ) {
/* equal => element already exists in set => delete iterator object again */
Coll_Iter_delete(new_element);
ready = 1;
} else if (isLess) {
/* smaller => insert the new element here */
Coll_Iter_setNext(new_element, iter);
Coll_Iter_setPrev(new_element, Coll_Iter_getPrev(iter));
Coll_Iter_setNext(Coll_Iter_getPrev(iter), new_element);
Coll_Iter_setPrev(iter, new_element);
/* update set administration */
_this->_nr_elements++;
ready = 1;
} else if (Coll_Iter_getNext(iter) == NULL){
/* append new element to the end of the set */
Coll_Iter_setPrev(new_element, iter);
Coll_Iter_setNext(iter, new_element);
/* update set administration */
_this->_last_element = new_element;
_this->_nr_elements++;
ready = 1;
} else {
/* do nothing */
}
iter = Coll_Iter_getNext(iter);
}
}
retValue = COLL_OK;
}
}
DLRL_INFO(INF_EXIT);
return retValue;
}
