/*
* Delete a data rectangle from an index structure.
* Pass in a pointer to a Rect, the tid of the record, ptr to ptr to root node.
* Returns 1 if record not found, 0 if success.
* RTreeDeleteRect provides for eliminating the root.
*/
int RTreeDeleteRect(struct Rect *R, long Tid, struct Node**Nn)
{
register struct Rect *r = R;
register long tid = Tid;
register struct Node **nn = Nn;
register int i;
struct Node *tmp_nptr = NULL;
struct ListNode *reInsertList = NULL;
register struct ListNode *e;
assert(r && nn);
assert(*nn);
assert(tid >= 0);
if (!RTreeDeleteRect2(r, tid, *nn, &reInsertList))
{
/* found and deleted a data item */
/* reinsert any branches from eliminated nodes */
while (reInsertList)
{
tmp_nptr = reInsertList->node;
for (i = 0; i < MAXKIDS(tmp_nptr); i++)
{
if (tmp_nptr->branch[i].child)
{
RTreeInsertRect(
&(tmp_nptr->branch[i].rect),
(long)(tmp_nptr->branch[i].child),
nn,
tmp_nptr->level);
}
}
e = reInsertList;
reInsertList = reInsertList->next;
RTreeFreeNode(e->node);
RTreeFreeListNode(e);
}
/* check for redundant root (not leaf, 1 child) and eliminate */
if ((*nn)->count == 1 && (*nn)->level > 0)
{
for (i = 0; i < NODECARD; i++)
{
tmp_nptr = (*nn)->branch[i].child;
if(tmp_nptr)
break;
}
assert(tmp_nptr);
RTreeFreeNode(*nn);
*nn = tmp_nptr;
}
return 0;
}
else
{
return 1;
}
}
/*
* should be called by RTreeDeleteRect() only
*
* Delete a data rectangle from an index structure.
* Pass in a pointer to a Rect, the tid of the record, ptr RTree.
* Returns 1 if record not found, 0 if success.
* RTreeDeleteRect1 provides for eliminating the root.
*/
int RTreeDeleteRectF(struct RTree_Rect *r, union RTree_Child child, struct RTree *t)
{
int i;
struct RTree_Node *n;
struct RTree_ListNode *e, *reInsertList = NULL;
if (!RTreeDeleteRect2F(r, child, t, &reInsertList)) {
/* found and deleted a data item */
/* reinsert any branches from eliminated nodes */
while (reInsertList) {
t->n_nodes--;
n = reInsertList->node;
if (n->level > 0) { /* reinsert node branches */
for (i = 0; i < t->nodecard; i++) {
if (n->branch[i].child.pos > -1) {
RTreeInsertRectF(&(n->branch[i].rect),
n->branch[i].child, n->level, t);
}
}
}
else { /* reinsert leaf branches */
for (i = 0; i < t->leafcard; i++) {
if (n->branch[i].child.id) {
RTreeInsertRectF(&(n->branch[i].rect),
n->branch[i].child, n->level, t);
}
}
}
e = reInsertList;
reInsertList = reInsertList->next;
RTreeFreeNode(e->node);
RTreeFreeListNode(e);
}
/* check for redundant root (not leaf, 1 child) and eliminate */
n = RTreeGetNode(t->rootpos, t->rootlevel, t);
if (n->count == 1 && n->level > 0) {
for (i = 0; i < t->nodecard; i++) {
if (n->branch[i].child.pos > -1)
break;
}
RTreeAddNodePos(t->rootpos, t->rootlevel, t);
t->rootpos = n->branch[i].child.pos;
t->rootlevel--;
t->n_nodes--;
}
return 0;
}
return 1;
}
