/// <summary>
/// Load one older log entry from temp file
/// </summary>
/// <returns></returns>
public override bool LoadOlderLogEntry()
{
if (IsAddingNewestEntries)
{
return(false);
}
if (LineNumberTopTempFile == 0 && LogEntryCollection[0].ID < 1)
{
return(false);
}
Log9KEntry entry = null;
bool success = false;
uint tries = 0;
while (!success)
{
if (tries > 100)
{
break;
}
entry = ReadEntry(LineNumberTopTempFile);
if (entry == null)
{
return(false);
}
uint firstLogEntryInCollectionID = LogEntryCollection[0].ID;
uint entryIDshoulBe = firstLogEntryInCollectionID - 1;
if (entry.ID != entryIDshoulBe)
{
if (entry.ID < entryIDshoulBe)
{
LineNumberTopTempFile++;
}
else if (entry.ID > entryIDshoulBe)
{
LineNumberTopTempFile--;
}
}
else
{
success = true;
}
tries++;
}
if (tries > 100)
{
uint lineNumber = LineNumberTopTempFile;
for (int i = 0; i < 30; i++)
{
lineNumber--;
if (ReadOlderLogEntryAndCheckIt(out entry, lineNumber))
{
LineNumberTopTempFile = lineNumber;
break;
}
}
for (int i = 0; i < 30; i++)
{
lineNumber++;
if (ReadOlderLogEntryAndCheckIt(out entry, lineNumber))
{
LineNumberTopTempFile = lineNumber;
break;
}
}
}
if (entry == null || LogEntryCollection.Contains(entry))
{
uint lineNumber;
if (FindLineNumber(LogEntryCollection[0].ID - 1, out lineNumber))
{
entry = ReadEntry(lineNumber);
}
}
if (entry != null)
{
CollectionInsert(0, entry);
}
return(true);
}
