private static SnapshotTableDifferences GetTableDifferences(TableDefinition tableDefinition, Snapshot before, Snapshot after)
{
var beforeKeys = SnapshotKeyExtractor.GetKeys(before, tableDefinition)?.Keys ?? new Dictionary <SnapshotRowKey, SnapshotRow>().Keys;
var afterKeys = SnapshotKeyExtractor.GetKeys(after, tableDefinition)?.Keys ?? new Dictionary <SnapshotRowKey, SnapshotRow>().Keys;
var deletedKeys = beforeKeys.Except(afterKeys).ToList();
var insertedKeys = afterKeys.Except(beforeKeys).ToList();
var differences = beforeKeys.Intersect(afterKeys)
.Select(k => new { Key = k, Before = before.GetRow(k, tableDefinition.TableName), After = after.GetRow(k, tableDefinition.TableName) })
.Select(rr => new { rr.Key, Differences = RowDataComparer.Compare(tableDefinition, rr.Key, rr.Before, rr.After) })
.Where(m => !m.Differences.Matched)
.ToList();
if (!deletedKeys.Any() && !insertedKeys.Any() && !differences.Any())
{
return(null);
}
var rowDiffs = deletedKeys.Select(k => new RowDifference(k, DifferenceType.Deleted, before.GetRow(k, tableDefinition.TableName), null))
.Concat(insertedKeys.Select(k => new RowDifference(k, DifferenceType.Inserted, null, after.GetRow(k, tableDefinition.TableName))))
.Concat(differences.Select(d => new RowDifference(d.Key, d.Differences, DifferenceType.Updated)))
.OrderBy(d => d.Key)
.ToList();
return(new SnapshotTableDifferences(rowDiffs, tableDefinition));
}
public static bool Match(SnapshotCollection collection, Snapshot before, Snapshot after)
{
foreach (var tableDefinition in collection.TablesInDefinitionOrder.Where(t => !t.ExcludeFromComparison))
{
//find all keys
var beforeRows = SnapshotKeyExtractor.GetKeys(before, tableDefinition) ?? new Dictionary <SnapshotRowKey, SnapshotRow>();
var afterRows = SnapshotKeyExtractor.GetKeys(after, tableDefinition) ?? new Dictionary <SnapshotRowKey, SnapshotRow>();
if (!beforeRows.Keys.SequenceEqual(afterRows.Keys))
{
return(false); //snapshots have row difference
}
foreach (var snapshotRowKey in beforeRows.Keys)
{
var beforeRow = beforeRows[snapshotRowKey];
var afterRow = afterRows[snapshotRowKey];
var match = RowDataComparer.Compare(tableDefinition, snapshotRowKey, beforeRow, afterRow);
if (!match.Matched)
{
return(false);
}
}
}
return(true);
}