public static CatalogDelta Create
(
[NotNull] CatalogState first,
[NotNull] CatalogState second
)
{
Sure.NotNull(first, "first");
Sure.NotNull(second, "second");
RecordState[] firstRecords = first.Records
.ThrowIfNull("first.Records");
RecordState[] secondRecords = second.Records
.ThrowIfNull("second.Records");
int[] firstDeleted = first.LogicallyDeleted
.ThrowIfNull("first.LogicallyDeleted");
int[] secondDeleted = second.LogicallyDeleted
.ThrowIfNull("second.LogicallyDeleted");
// TODO compare first.Database with second.Database?
CatalogDelta result = new CatalogDelta
{
FirstDate = first.Date,
SecondDate = second.Date,
Database = first.Database,
NewRecords = secondRecords.Except
(
firstRecords,
new RecordStateComparer.ByMfn()
)
.Select(state => state.Mfn)
.Where(mfn => mfn != 0)
.ToArray()
};
result.AlteredRecords = secondRecords.Except
(
firstRecords,
new RecordStateComparer.ByVersion()
)
.Select(state => state.Mfn)
.Where(mfn => mfn != 0)
.Except(result.NewRecords.ThrowIfNull("result.NewRecords"))
.Except(secondDeleted)
.ToArray();
result.DeletedRecords
= secondDeleted.Except(firstDeleted)
.Where(mfn => mfn != 0)
.ToArray();
return(result);
}
public virtual CatalogState GetCatalogState
(
[NotNull] string database
)
{
Sure.NotNullNorEmpty(database, nameof(database));
CatalogState result = new CatalogState
{
Database = database,
Date = PlatformAbstraction.Value.Today(),
Records = new RecordState[0]
};
return(result);
}