/// <summary>
/// Combines the content of the current SnapshotDifference with the one given.
/// </summary>
/// <param name="difference">SnapshotDifference to combine with</param>
/// <returns>SnapshotDifference with data combined.</returns>
public SnapshotDifference CombineWith(SnapshotDifference difference)
{
var existingKeys = new HashSet <DeserializerKey>(_missingItems.Select(item => item.Key));
var result = new List <MissingDeserializerInfo>(_missingItems);
result.AddRange(difference._missingItems.Where(item => !existingKeys.Contains(item.Key)));
return(new SnapshotDifference(result));
}
/// <summary>
/// Compares the snapshot (considered as actual) to the given base snapshots and returns the differences as a <see cref="SnapshotDifference"/>.
/// </summary>
/// <param name="snapshots">The list of base snapshots.</param>
/// <returns>The difference between the snapshots.</returns>
public SnapshotDifference CompareToBase(IEnumerable <Snapshot> snapshots)
{
SnapshotDifference result = SnapshotDifference.Empty;
foreach (Snapshot snapshot in snapshots.OrderByDescending(item => item.TakenDate))
{
result = result.CombineWith(CompareToBase(snapshot));
}
return(result);
}