/// <summary>
/// Moves to the first row (as defined by the cursor) where the index entries
/// are >= the given values.
/// </summary>
/// <remarks>
/// Moves to the first row (as defined by the cursor) where the index entries
/// are >= the given values. If a an exception is thrown, the cursor is
/// restored to its previous state.
/// </remarks>
/// <param name="entryValues">the column values for the index's columns.</param>
/// <exception cref="System.IO.IOException"></exception>
public virtual void FindClosestRowByEntry(params object[] entryValues)
{
Cursor.Position curPos = _curPos;
Cursor.Position prevPos = _prevPos;
bool found = false;
try
{
FindRowByEntryImpl(ToRowValues(entryValues), false);
found = true;
}
finally
{
if (!found)
{
try
{
RestorePosition(curPos, prevPos);
}
catch (IOException e)
{
System.Console.Error.WriteLine("Failed restoring position");
Sharpen.Runtime.PrintStackTrace(e, System.Console.Error);
}
}
}
}
/// <exception cref="System.IO.IOException"></exception>
protected internal override Cursor.Position FindAnotherPosition(Table.RowState rowState
, Cursor.Position curPos, bool moveForward)
{
IndexCursor.IndexDirHandler handler = ((IndexCursor.IndexDirHandler)GetDirHandler
(moveForward));
IndexCursor.IndexPosition endPos = (IndexCursor.IndexPosition)handler.GetEndPosition
();
IndexData.Entry entry = handler.GetAnotherEntry();
return((!entry.Equals(endPos.GetEntry())) ? new IndexCursor.IndexPosition(entry)
: endPos);
}
/// <exception cref="System.IO.IOException"></exception>
protected internal override void RestorePositionImpl(Cursor.Position curPos, Cursor.Position
prevPos)
{
if (!(curPos is IndexCursor.IndexPosition) || !(prevPos is IndexCursor.IndexPosition
))
{
throw new ArgumentException("Restored positions must be index positions");
}
_entryCursor.RestorePosition(((IndexCursor.IndexPosition)curPos).GetEntry(), ((IndexCursor.IndexPosition
)prevPos).GetEntry());
base.RestorePositionImpl(curPos, prevPos);
}
