/// <summary>
/// Tries to merge values.
/// </summary>
/// <typeparam name="T">The type of the value to merge.</typeparam>
/// <param name="first">First value.</param>
/// <param name="second">Second value.</param>
/// <param name="valueSelector">Value selector.</param>
/// <returns>The result of the merge attempt.</returns>
private static Result <T?> TryMergeValue <T>(
SongDirectorDataModel first,
SongDirectorDataModel second,
Func <SongDirectorDataModel, T?> valueSelector)
{
T?firstValue = valueSelector(first);
T?secondValue = valueSelector(second);
if (firstValue == null && secondValue == null)
{
return(Result.Ok <T?>(default));
/// <summary>
/// Tries to merge two data models.
/// </summary>
/// <param name="first">First data model.</param>
/// <param name="second">Second data model.</param>
/// <returns>The result of the attempt.</returns>
private static Result <SongDirectorDataModel> TryMerge(
SongDirectorDataModel first, SongDirectorDataModel second)
{
// Return a failure result if the ids of the two data models can't be merged
if (first.Id != second.Id)
{
return(Result.Fail("Song director data models with different ids can't be merged."));
}
// Merge values
Result <string?> mergeFullNameResult = TryMergeValue(first, second, m => m.FullName);
Result <string?> mergeEmailAddressResult = TryMergeValue(
first, second, m => m.EmailAddress);
Result <string?> mergePhoneNumberResult = TryMergeValue(
first, second, m => m.PhoneNumber);
Result <string?> mergeRankNameResult = TryMergeValue(first, second, m => m.RankName);
Result <bool?> mergeIsActiveResult = TryMergeValue(first, second, m => m.IsActive);
// Validate merges
Result mergeResult = Result.Merge(
mergeEmailAddressResult,
mergeFullNameResult,
mergeIsActiveResult,
mergePhoneNumberResult,
mergeRankNameResult);
// Return a failure result if any merges failed
if (mergeResult.IsFailed)
{
return(mergeResult);
}
// Return a success result if the merges succeeded
return(Result.Ok(new SongDirectorDataModel(
first.Id,
mergeFullNameResult.Value,
mergeEmailAddressResult.Value,
mergePhoneNumberResult.Value,
mergeRankNameResult.Value,
mergeIsActiveResult.Value)));
}
/// <summary>
/// Tries to merge song director data models.
/// </summary>
/// <param name="songDirectorDataModels">The song director data models to merge.</param>
/// <returns>The result of the merge attempt.</returns>
public static Result <SongDirectorDataModel> TryMerge(
IEnumerable <SongDirectorDataModel> songDirectorDataModels)
{
SongDirectorDataModel[] dataModelArray = songDirectorDataModels.ToArray();
SongDirectorDataModel current = dataModelArray[0];
for (int i = 1; i < dataModelArray.Length; i++)
{
SongDirectorDataModel next = dataModelArray[i];
Result <SongDirectorDataModel> mergeResult = TryMerge(current, next);
if (mergeResult.IsFailed)
{
return(mergeResult);
}
current = mergeResult.Value;
}
return(Result.Ok(current));
}
