private void SplitPage()
{
#if DUMP_INSERTS
System.Diagnostics.Trace.WriteLine("Split page #" + this.RecordNo);
#endif
var ndxFile = (NdxFile)mHolder.mFile;
// split needed (on save)
int mid = EntriesCount / 2;
if (ParentPage == null)
{
ParentPage = (NdxPage)ndxFile.NewPage(null);
var rootEntry = new NdxEntry();
var lastEntry = GetEntry(EntriesCount - 1);
rootEntry.DbfRecordNo = lastEntry.DbfRecordNo;
rootEntry.Fields = lastEntry.Fields.Clone();
rootEntry.LowerPageRecordNo = this.RecordNo;
ParentPage.EntriesClear();
ParentPage.EntriesInsert(0, rootEntry);
ndxFile.mNdxHeader.StartingPageRecordNo = ParentPage.RecordNo;
//ParentPage.mNbChildEntries = mNbChildEntries;
ParentPage.mIsModified = true;
#if DUMP_INSERTS
System.Diagnostics.Trace.WriteLine(" Create new parent page #" + mParentPage.RecordNo);
mParentPage.Dump(" ");
#endif
}
var newPage = (NdxPage)ndxFile.NewPage(ParentPage);
newPage.EntriesClear();
newPage.mIsModified = true;
newPage.ParentPage = ParentPage;
for (int i = 0; i < mid; i++)
{
//mNbChildEntries = mNbChildEntries;
newPage.EntriesInsert(i, GetEntry(i));
var lowerPageRecordNo = GetEntry(i).LowerPageRecordNo;
if (lowerPageRecordNo != UInt32.MaxValue)
{
var ndxPage2 = ndxFile.InternalGetPage(
ParentPage,
lowerPageRecordNo,
/* returnNullIfNotInCache */ true) as NdxPage;
if (ndxPage2 != null)
{
ndxPage2.ParentPage = newPage;
}
}
}
EntriesRemoveRange(0, mid);
var midEntry = newPage.GetEntry(mid - 1);
var newMidEntry = new NdxEntry()
{
DbfRecordNo = midEntry.DbfRecordNo,
LowerPageRecordNo = newPage.RecordNo,
Fields = midEntry.Fields.Clone()
};
#if DUMP_INSERTS
System.Diagnostics.Trace.WriteLine(" newPage #" + newPage.RecordNo);
newPage.Dump(" ");
System.Diagnostics.Trace.WriteLine(" this page #" + RecordNo);
Dump(" ");
#endif
int midEntryPos = ParentPage.FindInsertPos(newMidEntry, ndxFile);
ParentPage.InsertInThisPage(newMidEntry, midEntryPos);
}