/// <summary>
/// Conditionally sets a bookmark for use in a future run.
/// </summary>
/// <param name="sourcePath">The source path associated with the bookmark.</param>
/// <param name="latestFound">The dateTime of the latest item found.</param>
/// <remarks>Only sets a bookmark if <see cref="SelectIncremental"/> is set AND
/// sourcePath has a value. Otherwise, does nothing.
/// </remarks>
public bool SetBookmark(string sourcePath, DateTime?latestFound)
{
if (!SelectIncremental)
{
return(false);
}
if (!latestFound.HasValue)
{
return(false);
}
var bookmark = new IncrementalBookmark(DestinationDirectory);
bookmark.SetBookmark(sourcePath, latestFound.Value);
return(true);
}
/// <summary>
/// Determine the date after which items should be selected based on bookmark and source path.
/// </summary>
/// <param name="sourcePath">The source path which is used to look up a bookmark.</param>
/// <returns>A <see cref="DateTime?"/> which, if it has a value, is the date-time after which items should be selected.</returns>
/// <remarks>
/// Picks the latter of <see cref="SelectAfter"/> or the bookmark associated with
/// sourcePath contingent on whether SelectAfter and <see cref="SelectIncremental"/>
/// is set.
/// </remarks>
public DateTime?GetBookmarkOrAfter(string sourcePath)
{
// Determine the "after" threshold from SelectAfter and SelectIncremental
DateTime?after = SelectAfter;
if (SelectIncremental)
{
var bookmark = new IncrementalBookmark(DestinationDirectory);
var incrementalAfter = bookmark.GetBookmark(sourcePath);
if (incrementalAfter.HasValue)
{
if (!after.HasValue || after.Value < incrementalAfter.Value)
{
after = incrementalAfter;
}
}
}
return(after);
}
