/* CreateObject
* This is the first time you have
* access to the editdata, so it
* needs to be initialized with
* default values. Just be aware
* that if the user chooses to
* create your object from a file,
* CreateFromFile will be called
* instead of this function.
*/
int MMF2Func CreateObject(mv *mV, LO *lo, SerializedED *SED)
{
#ifndef RUN_ONLY
if(IS_COMPATIBLE(mV)) //Make sure MMF2 hasn't changed in a way that makes your extension incompatible
{
Edif::Init(mV, SED);
EditData().Serialize(mV, SED); //create & store the default editdata
return 0;
}
#endif
return -1;
}
t_rc INXM_IndexHandle::FindAndAppend(int rootPageID, void *key, const REM_RecordID &rid) {
t_rc rc;
STORM_PageHandle leafPageHandle;
rc = FindLeaf(rootPageID, key, leafPageHandle);
if (rc != OK) { return rc; }
INXM_InitPageHeader initPageHeader;
rc = LoadInitHeaders(leafPageHandle, initPageHeader);
if (rc != OK) { return rc; }
INXM_Node node;
int i;
for (i=0; i < initPageHeader.nItems; i++) {
rc = ReadNode(leafPageHandle, i, node);
if (rc != OK) { return rc; }
if (KeyCmp(key, node.key) == 0) {
break;
}
}
if (i == initPageHeader.nItems) {
return(INXM_KEY_NOT_FOUND);
} else {
int slotOfNewData;
STORM_PageHandle lastDataPageHandle;
rc = this->sfh.GetPage(this->inxmFileHeader.lastDataPage, lastDataPageHandle);
if (rc != OK) { return rc; }
/* Check if last data page has room. */
INXM_InitPageHeader initPageHeader;
rc = LoadInitHeaders(lastDataPageHandle, initPageHeader);
if (rc != OK) { return rc; }
int room = PAGE_DATA_SIZE-(INXM_INITPAGEHEADER_SIZE+(initPageHeader.nItems+1)*INXM_DATA_SIZE);
/* If no room. Reserve new last data page. */
if (room < 0 ) {
CreateLastDataPage(lastDataPageHandle);
/* Write last data. */
WriteData(lastDataPageHandle, rid, slotOfNewData);
} else if (room == 0) {
/* Write last data. */
WriteData(lastDataPageHandle, rid, slotOfNewData);
CreateLastDataPage(lastDataPageHandle);
} else {
/* Write last data. */
WriteData(lastDataPageHandle, rid, slotOfNewData);
}
/* Update last-1 link data. */
STORM_PageHandle listDataPageHandle;
this->sfh.GetPage(node.left, listDataPageHandle);
INXM_Data data;
ReadData(listDataPageHandle, node.slot, data);
int fromWhere = node.slot;
while (data.nextPageID != 0) {
this->sfh.GetPage(data.nextPageID, listDataPageHandle);
fromWhere = data.nextSlot;
ReadData(listDataPageHandle, data.nextSlot, data);
}
data.nextPageID=this->inxmFileHeader.lastDataPage;
data.nextSlot=slotOfNewData;
/* Write updated last-1 data of list. */
EditData(listDataPageHandle, fromWhere, data);
return(OK);
}
}
