internal static TypeErrors Merge(this TypeErrors first, TypeErrors other)
{
if (first == null)
{
return other;
}
if (other == null)
{
return first;
}
if (first == other)
{
return first;
}
if (first.Type == other.Type)
{
if (first.Errors.Count == 0)
{
return other;
}
if (other.Errors.Count == 0)
{
return first;
}
var errors = new MergedErrors(first.Errors, other.Errors);
return new TypeErrors(first.Type, errors);
}
return new TypeErrors(null, new[] { first, other });
}
internal static TypeErrors Merge(this TypeErrors first, TypeErrors other)
{
if (first == null)
{
return(other);
}
if (other == null)
{
return(first);
}
if (first == other)
{
return(first);
}
if (first.Type == other.Type)
{
if (first.Errors.Count == 0)
{
return(other);
}
if (other.Errors.Count == 0)
{
return(first);
}
var errors = new MergedErrors(first.Errors, other.Errors);
return(new TypeErrors(first.Type, errors));
}
return(new TypeErrors(null, new[] { first, other }));
}
internal static StringBuilder AppendSuggestImmutable(this StringBuilder errorBuilder, TypeErrors errors)
{
var fixableTypes = errors.AllErrors.OfType<TypeErrors>()
.Where(x => x.Type != errors.Type)
.Select(x => x.Type)
.Distinct()
.ToArray();
if (!fixableTypes.Any())
{
return errorBuilder;
}
foreach (var type in fixableTypes)
{
var line = type.Assembly == typeof(int).Assembly
? $"* Use an immutable type instead of {type.PrettyName()}."
: $"* Make {type.PrettyName()} immutable or use an immutable type.";
errorBuilder.AppendLine(line);
}
errorBuilder.AppendLine(" - For immutable types the following must hold:")
.AppendLine(" - Must be a sealed class or a struct.")
.AppendLine(" - All fields and properties must be readonly.")
.AppendLine(" - All field and property types must be immutable.")
.AppendLine(" - All indexers must be readonly.")
.AppendLine(" - Event fields are ignored.");
return errorBuilder;
}
private static void ThrowIfHasErrors(this TypeErrors errors, MemberSettings settings, string className, string methodName)
{
if (errors == null)
{
return;
}
if (errors.Errors.Count == 1 && ReferenceEquals(errors.Errors[0], RequiresReferenceHandling.ComplexType))
{
return;
}
var errorBuilder = new StringBuilder();
errorBuilder.AppendFailed(className, methodName)
.AppendNotSupported(errors)
.AppendSolveTheProblemBy()
.AppendSuggestEquatable(errors)
.AppendLine($"* Use {settings.GetType().Name} and specify how comparing is performed:")
.AppendSuggestReferenceHandling(errors, settings)
.AppendSuggestExclude(errors);
var message = errorBuilder.ToString();
throw new NotSupportedException(message);
}
// ReSharper disable once UnusedParameter.Local
internal static void IfHasErrors(TypeErrors errors, MemberSettings settings, string className, string methodName)
{
if (errors.HasErrors())
{
var message = GetErrorText(errors, settings, className, methodName);
throw new NotSupportedException(message);
}
}
public static IReadOnlyList <Error> MergeAll(TypeErrors typeErrors, IReadOnlyCollection <Error> errors)
{
var allErrors = new List <Error> {
typeErrors
};
Add(errors, allErrors);
return(allErrors);
}
internal static void CanTrackValue(object value, PropertiesSettings settings)
{
var errors = GetOrCreateErrors(value.GetType(), settings);
if (errors != null)
{
var typeErrors = new TypeErrors(null, errors);
Throw.IfHasErrors(typeErrors, settings, typeof(Track).Name, nameof(Track.Changes));
}
}
// ReSharper disable once UnusedParameter.Local
internal static Exception CannotCopyFixesSizeCollections(
IEnumerable source,
IEnumerable target,
MemberSettings settings)
{
var error = new CannotCopyFixedSizeCollectionsError(source, target);
var typeErrors = new TypeErrors(target.GetType(), error);
var message = typeErrors.GetErrorText(settings, typeof(Copy).Name, settings.CopyMethodName());
return(new InvalidOperationException(message));
}
private static bool TryEquals(TypeErrors x, TypeErrors y, out bool result)
{
if (x == null || y == null)
{
result = false;
return(false);
}
result = x.Type == y.Type;
return(true);
}
// ReSharper disable once UnusedParameter.Local
internal static void ReadonlyMemberDiffers(
SourceAndTargetValue sourceAndTargetValue,
MemberInfo member,
MemberSettings settings)
{
var error = new ReadonlyMemberDiffersError(sourceAndTargetValue, member);
var typeErrors = new TypeErrors(sourceAndTargetValue.Source?.GetType(), error);
var message = typeErrors.GetErrorText(settings, typeof(Copy).Name, settings.CopyMethodName());
throw new InvalidOperationException(message);
}
internal static StringBuilder AppendSuggestNotify(this StringBuilder errorBuilder, TypeErrors errors)
{
foreach (var error in errors.AllErrors.OfType<TypeErrors>().Where(te => te.HasError<IFixWithNotify>()).Distinct())
{
var fixable = error.Errors.OfType<IFixWithNotify>()
.First();
fixable.AppendSuggestFixWithNotify(errorBuilder, error.Type);
}
return errorBuilder;
}
internal static InvalidOperationException CreateCannotCreateInstanceException(
object sourceValue,
MemberSettings settings,
Exception exception)
{
var cannotCopyError = new CannotCreateInstanceError(sourceValue);
var typeErrors = new TypeErrors(sourceValue.GetType(), new Error[] { cannotCopyError });
var message = typeErrors.GetErrorText(settings, typeof(Copy).Name, settings.CopyMethodName());
return(new InvalidOperationException(message, exception));
}
// ReSharper disable once UnusedParameter.Local
internal static void ReadonlyMemberDiffers(
SourceAndTargetValue sourceAndTargetValue,
MemberInfo member,
MemberSettings settings)
{
var error = new ReadonlyMemberDiffersError(sourceAndTargetValue, member);
var typeErrors = new TypeErrors(sourceAndTargetValue.Source?.GetType(), error);
var message = typeErrors.GetErrorText(settings, typeof(Copy).Name, settings.CopyMethodName());
throw new InvalidOperationException(message);
}
private static bool HasErrors(this TypeErrors errors)
{
if (errors == null)
{
return(false);
}
if (errors.Errors.Count == 1 && ReferenceEquals(errors.Errors[0], RequiresReferenceHandling.ComplexType))
{
return(false);
}
return(true);
}
// ReSharper disable once UnusedParameter.Local
private static void ThrowIfHasErrors(this TypeErrors errors, MemberSettings settings, string className, string methodName)
{
if (errors == null)
{
return;
}
if (errors.Errors.Count == 1 && ReferenceEquals(errors.Errors[0], RequiresReferenceHandling.ComplexType))
{
return;
}
var message = errors.GetErrorText(settings, className, methodName);
throw new NotSupportedException(message);
}
internal static StringBuilder AppendSuggestEquatable(this StringBuilder errorBuilder, TypeErrors errors)
{
const string Format = "IEquatable<{0}>";
var types = errors.AllErrors.OfType<TypeErrors>()
.Select(x => x.Type)
.Distinct();
foreach (var type in types)
{
var iEquatable = string.Format(Format, type.PrettyName());
var line = type.Assembly == typeof(int).Assembly
? $"* Use a type that implements IEquatable<> instead of {type.PrettyName()}."
: $"* Implement {iEquatable} for {type.PrettyName()} or use a type that does.";
errorBuilder.AppendLine(line);
}
return errorBuilder;
}
private bool TryMerge(TypeErrors error)
{
if (error == null)
{
return(false);
}
var match = this.errors.OfType <TypeErrors>().SingleOrDefault(e => e.Type == error.Type);
if (match != null)
{
this.errors.Remove(match);
var merged = match.Merge(error);
this.errors.Add(merged);
return(true);
}
this.errors.Add(error);
return(true);
}
// ReSharper disable once UnusedParameter.Local
private static string GetErrorText(this TypeErrors errors, MemberSettings settings, string className, string methodName)
{
var errorBuilder = new StringBuilder();
errorBuilder.AppendCopyFailed(className, methodName)
.AppendNotSupported(errors)
.AppendSolveTheProblemBy()
.AppendSuggestImmutable(errors)
.AppendSuggestResizableCollection(errors)
.AppendSuggestDefaultCtor(errors)
.AppendLine($"* Use {settings.GetType().Name} and specify how copying is performed:")
.AppendLine($" - {typeof(ReferenceHandling).Name}.{nameof(ReferenceHandling.Structural)} means that a the entire graph is traversed and immutable property values are copied.")
.AppendLine($" - For structural Activator.CreateInstance is used to create instances so a parameterless constructor may be needed, can be private.")
.AppendLine($" - {typeof(ReferenceHandling).Name}.{nameof(ReferenceHandling.References)} means that references are copied.")
.AppendSuggestExclude(errors);
var message = errorBuilder.ToString();
return(message);
}
// ReSharper disable once UnusedParameter.Local
private static string GetErrorText(TypeErrors errors, MemberSettings settings, string className, string methodName)
{
var errorBuilder = new StringBuilder();
errorBuilder.AppendLine($"{className}.{methodName}(x, y) failed.")
.AppendNotSupported(errors)
.AppendSolveTheProblemBy()
.AppendSuggestNotify(errors)
.AppendSuggestImmutable(errors)
.AppendSuggestResizableCollection(errors)
.AppendSuggestDefaultCtor(errors)
.AppendLine($"* Use {settings?.GetType().Name} and specify how change tracking is performed:")
.AppendLine($" - {typeof(ReferenceHandling).Name}.{nameof(ReferenceHandling.Structural)} means that a the entire graph is tracked.")
.AppendLine($" - {typeof(ReferenceHandling).Name}.{nameof(ReferenceHandling.References)} means that only the root level changes are tracked.")
.AppendSuggestExclude(errors);
var message = errorBuilder.ToString();
return(message);
}
private static StringBuilder AppendSuggestReferenceHandling(
this StringBuilder errorBuilder,
TypeErrors errors,
MemberSettings settings)
{
var references = $" - {typeof(ReferenceHandling).Name}.{nameof(ReferenceHandling.References)} means that reference equality is used.";
if (settings.ReferenceHandling == ReferenceHandling.Throw)
{
if (errors.AllErrors.OfType<RequiresReferenceHandling>().Any())
{
return errorBuilder.AppendLine($" - {typeof(ReferenceHandling).Name}.{nameof(ReferenceHandling.Structural)} means that a deep equals is performed.")
.AppendLine(references);
}
}
if (errors.AllErrors.OfType<ReferenceLoop>().Any())
{
return errorBuilder.AppendLine(references);
}
return errorBuilder;
}
internal static StringBuilder AppendNotSupported(this StringBuilder errorBuilder, TypeErrors errors)
{
foreach (var error in errors.AllErrors.OfType<INotSupported>().Distinct())
{
error.AppendNotSupported(errorBuilder);
}
foreach (var member in errors.AllErrors.OfType<MemberErrors>().Select(x => x.Member).Distinct())
{
errorBuilder.AppendNotSupportedMember(member);
}
if (errors.AllErrors.OfType<UnsupportedIndexer>().Any())
{
errorBuilder.AppendLine("Indexers are not supported.");
foreach (var indexer in errors.AllErrors.OfType<UnsupportedIndexer>().Select(x => x.Indexer).Distinct())
{
errorBuilder.AppendNotSupportedMember(indexer);
}
}
return errorBuilder;
}
private static StringBuilder AppendSuggestReferenceHandling(
this StringBuilder errorBuilder,
TypeErrors errors,
MemberSettings settings)
{
var references = $" - {typeof(ReferenceHandling).Name}.{nameof(ReferenceHandling.References)} means that reference equality is used.";
if (settings.ReferenceHandling == ReferenceHandling.Throw)
{
if (errors.AllErrors.OfType <RequiresReferenceHandling>().Any())
{
return(errorBuilder.AppendLine($" - {typeof(ReferenceHandling).Name}.{nameof(ReferenceHandling.Structural)} means that a deep equals is performed.")
.AppendLine(references));
}
}
if (errors.AllErrors.OfType <ReferenceLoop>().Any())
{
return(errorBuilder.AppendLine(references));
}
return(errorBuilder);
}
internal static StringBuilder AppendNotSupported(this StringBuilder errorBuilder, TypeErrors errors)
{
foreach (var error in errors.AllErrors.OfType <INotSupported>().Distinct())
{
error.AppendNotSupported(errorBuilder);
}
foreach (var member in errors.AllErrors.OfType <MemberErrors>().Select(x => x.Member).Distinct())
{
errorBuilder.AppendNotSupportedMember(member);
}
if (errors.AllErrors.OfType <UnsupportedIndexer>().Any())
{
errorBuilder.AppendLine("Indexers are not supported.");
foreach (var indexer in errors.AllErrors.OfType <UnsupportedIndexer>().Select(x => x.Indexer).Distinct())
{
errorBuilder.AppendNotSupportedMember(indexer);
}
}
return(errorBuilder);
}
internal static StringBuilder AppendSuggestDefaultCtor(this StringBuilder errorBuilder, TypeErrors errors)
{
foreach (var type in errors.AllErrors.OfType<CannotCreateInstanceError>().Select(x => x.Type).Distinct())
{
errorBuilder.AppendLine($"* Add a parameterless constructor to {type.PrettyName()}, can be private.");
}
return errorBuilder;
}
internal static StringBuilder AppendSuggestResizableCollection(this StringBuilder errorBuilder, TypeErrors errors)
{
foreach (var type in errors.AllErrors.OfType<CannotCopyFixedSizeCollectionsError>().Select(x => x.Type).Distinct())
{
errorBuilder.AppendLine($"* Use a resizable collection like List<{type.GetItemType().PrettyName()}> instead of {type.PrettyName()}.")
.AppendLine("* Check that the collections are the same size before calling.");
}
return errorBuilder;
}
public MemberErrors(MemberPath path, TypeErrors errors)
{
this.Path = path;
this.Error = errors;
this.Errors = errors == null ? EmptyErrors : new[] { errors };
}
// ReSharper disable once UnusedParameter.Local
internal static Exception CannotCopyFixesSizeCollections(
IEnumerable source,
IEnumerable target,
MemberSettings settings)
{
var error = new CannotCopyFixedSizeCollectionsError(source, target);
var typeErrors = new TypeErrors(target.GetType(), error);
var message = typeErrors.GetErrorText(settings, typeof(Copy).Name, settings.CopyMethodName());
return new InvalidOperationException(message);
}
internal static InvalidOperationException CreateCannotCreateInstanceException(
object sourceValue,
MemberSettings settings,
Exception exception)
{
var cannotCopyError = new CannotCreateInstanceError(sourceValue);
var typeErrors = new TypeErrors(sourceValue.GetType(), new Error[] { cannotCopyError });
var message = typeErrors.GetErrorText(settings, typeof(Copy).Name, settings.CopyMethodName());
return new InvalidOperationException(message, exception);
}
internal static StringBuilder AppendSuggestResizableCollection(this StringBuilder errorBuilder, TypeErrors errors)
{
foreach (var type in errors.AllErrors.OfType <CannotCopyFixedSizeCollectionsError>().Select(x => x.Type).Distinct())
{
errorBuilder.AppendLine($"* Use a resizable collection like List<{type.GetItemType().PrettyName()}> instead of {type.PrettyName()}.")
.AppendLine("* Check that the collections are the same size before calling.");
}
return(errorBuilder);
}
internal static StringBuilder AppendSuggestDefaultCtor(this StringBuilder errorBuilder, TypeErrors errors)
{
foreach (var type in errors.AllErrors.OfType <CannotCreateInstanceError>().Select(x => x.Type).Distinct())
{
errorBuilder.AppendLine($"* Add a parameterless constructor to {type.PrettyName()}, can be private.");
}
return(errorBuilder);
}
internal static StringBuilder AppendSuggestEquatable(this StringBuilder errorBuilder, TypeErrors errors)
{
const string Format = "IEquatable<{0}>";
var types = errors.AllErrors.OfType <TypeErrors>()
.Select(x => x.Type)
.Distinct();
foreach (var type in types)
{
var iEquatable = string.Format(Format, type.PrettyName());
var line = type.Assembly == typeof(int).Assembly
? $"* Use a type that implements IEquatable<> instead of {type.PrettyName()}."
: $"* Implement {iEquatable} for {type.PrettyName()} or use a type that does.";
errorBuilder.AppendLine(line);
}
return(errorBuilder);
}
internal static StringBuilder AppendSuggestImmutable(this StringBuilder errorBuilder, TypeErrors errors)
{
var fixableTypes = errors.AllErrors.OfType <TypeErrors>()
.Where(x => x.Type != errors.Type)
.Select(x => x.Type)
.Distinct()
.ToArray();
if (!fixableTypes.Any())
{
return(errorBuilder);
}
foreach (var type in fixableTypes)
{
var line = type.Assembly == typeof(int).Assembly
? $"* Use an immutable type instead of {type.PrettyName()}."
: $"* Make {type.PrettyName()} immutable or use an immutable type.";
errorBuilder.AppendLine(line);
}
errorBuilder.AppendLine(" - For immutable types the following must hold:")
.AppendLine(" - Must be a sealed class or a struct.")
.AppendLine(" - All fields and properties must be readonly.")
.AppendLine(" - All field and property types must be immutable.")
.AppendLine(" - All indexers must be readonly.")
.AppendLine(" - Event fields are ignored.");
return(errorBuilder);
}
public CollectionErrors(MemberPath memberPath, TypeErrors typeErrors)
{
this.Path = memberPath;
this.Errors = new[] { typeErrors };
}
public CollectionErrors(MemberPath memberPath, TypeErrors typeErrors)
{
this.Path = memberPath;
this.Errors = new[] { typeErrors };
}
internal static StringBuilder AppendSuggestNotify(this StringBuilder errorBuilder, TypeErrors errors)
{
foreach (var error in errors.AllErrors.OfType <TypeErrors>().Where(te => te.HasError <IFixWithNotify>()).Distinct())
{
var fixable = error.Errors.OfType <IFixWithNotify>()
.First();
fixable.AppendSuggestFixWithNotify(errorBuilder, error.Type);
}
return(errorBuilder);
}
internal static StringBuilder AppendSuggestExclude(this StringBuilder errorBuilder, TypeErrors errors)
{
var types = errors.AllErrors.OfType <TypeErrors>()
.Where(e => e.Type != errors.Type)
.Select(x => x.Type)
.Distinct()
.ToArray();
if (types.Any() || errors.AllErrors.OfType <IExcludableMember>().Any())
{
errorBuilder.AppendLine(" - Exclude a combination of the following:");
foreach (var member in errors.AllErrors.OfType <IExcludableMember>().Select(x => x.Member).Distinct())
{
errorBuilder.AppendSuggestExcludeMember(member);
}
foreach (var type in types)
{
if (type == errors.Type)
{
continue;
}
errorBuilder.AppendLine($" - The type {type.PrettyName()}.");
}
}
return(errorBuilder);
}
internal static StringBuilder AppendSuggestExclude(this StringBuilder errorBuilder, TypeErrors errors)
{
var types = errors.AllErrors.OfType<TypeErrors>()
.Where(e => e.Type != errors.Type)
.Select(x => x.Type)
.Distinct()
.ToArray();
if (types.Any() || errors.AllErrors.OfType<IExcludableMember>().Any())
{
errorBuilder.AppendLine(" - Exclude a combination of the following:");
foreach (var member in errors.AllErrors.OfType<IExcludableMember>().Select(x => x.Member).Distinct())
{
errorBuilder.AppendSuggestExcludeMember(member);
}
foreach (var type in types)
{
if (type == errors.Type)
{
continue;
}
errorBuilder.AppendLine($" - The type {type.PrettyName()}.");
}
}
return errorBuilder;
}
public MemberErrors(MemberPath path, TypeErrors errors)
{
this.Path = path;
this.Error = errors;
this.Errors = errors == null ? EmptyErrors : new[] { errors };
}