static object Clone(object instance, VisitedGraph visited, object clone)
{
if (visited.ContainsKey(instance))
{
return(visited[instance]);
}
visited.Add(instance, clone);
Type type = instance.GetType();
while (type != null)
{
var ta = TypeAccessor.GetAccessor(type);
foreach (FieldInfo field in type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
{
object value = ta.GetField(field.Name, instance);
object cloneValue = visited.ContainsKey(value) ? visited[value] : Clone(value, visited);
ta.SetField(field.Name, clone, cloneValue);
}
type = type.BaseType;
}
return(clone);
}
/// <summary>
/// Creates a deep copy of an object using the supplied dictionary of visited objects as
/// a source of objects already encountered in the copy traversal. The dictionary of visited
/// objects is used for holding objects that have already been copied, to avoid erroneous
/// duplication of parts of the object graph.
/// </summary>
/// <param name="instance">The object to be copied.</param>
/// <param name="visited">The graph of objects visited so far.</param>
/// <returns></returns>
private static object Clone(this object instance, VisitedGraph visited)
{
if (instance == null)
return null;
Type instanceType = instance.GetType();
if (instanceType.IsValueType || instanceType == typeof(string))
return instance; // Value types and strings are immutable
else if (instanceType.IsArray)
{
int length = ((Array)instance).Length;
Array copied = (Array)Activator.CreateInstance(instanceType, length);
visited.Add(instance, copied);
for (int i = 0; i < length; ++i)
copied.SetValue(((Array)instance).GetValue(i).Clone(visited), i);
return copied;
}
else
return Clone(instance, visited, InstanceCreator.GetInstance(instanceType));
}
static object Clone(object instance, VisitedGraph visited)
{
if (instance == null)
{
return(null);
}
Type instanceType = instance.GetType();
if (instanceType.IsPointer || instanceType == typeof(Pointer) || instanceType.IsPrimitive || instanceType == typeof(string))
{
return(instance); // Pointers, primitive types and strings are considered immutable
}
if (instanceType.GetInterface(CloneableInterface) != null)
{
return(((ICloneable)instance).Clone());
}
if (typeof(Type).IsAssignableFrom(instanceType) || typeof(MemberInfo).IsAssignableFrom(instanceType) || typeof(ParameterInfo).IsAssignableFrom(instanceType))
{
return(instance);
}
if (instanceType.IsArray)
{
var array = (Array)instance;
int length = array.Length;
Array copied = (Array)Activator.CreateInstance(instanceType, length);
visited.Add(instance, copied);
for (int i = 0; i < length; ++i)
{
var clone = Clone(array.GetValue(i), visited);
copied.SetValue(clone, i);
}
return(copied);
}
return(Clone(instance, visited, CreateInstance(instanceType)));
}
private static object Clone(this object instance, VisitedGraph visited, object copy)
{
visited.Add(instance, copy);
var type = instance.GetType();
foreach (var field in GetTypeCopyableFieldList(type))
{
object value = field.Getter(instance);
object cloned;
if (value == null)
cloned = null;
else if (!visited.TryGetValue(value, out cloned))
cloned = value.Clone(visited);
field.Setter(copy, cloned);
}
return copy;
}
/// <summary>
/// Creates a deep copy of an object using the supplied dictionary of visited objects as
/// a source of objects already encountered in the copy traversal. The dictionary of visited
/// objects is used for holding objects that have already been copied, to avoid erroneous
/// duplication of parts of the object graph.
/// </summary>
/// <param name="instance">The object to be copied.</param>
/// <param name="visited">The graph of objects visited so far.</param>
/// <param name="copy">The object to copy to.</param>
/// <param name="expectedType">The type that should be found.</param>
/// <param name="overrideSettings">Settings to override the copy logic.</param>
/// <typeparam name="T">The type of the instance given.</typeparam>
/// <returns>The copied object.</returns>
private static T Clone <T>(this T instance, VisitedGraph visited, T copy, Type expectedType, IList <ICopyOverrideSettings> overrideSettings = null)
{
if (ShouldUseVisitedGraph(overrideSettings))
{
if (visited.ContainsKey(instance))
{
return((T)visited[instance]);
}
else
{
visited.Add(instance, copy);
}
}
Type type = instance.GetType();
string instanceTypeNameString = type.FullName;
bool shouldSkip = CheckIfShouldSkip(overrideSettings, type.FullName, false);
if (shouldSkip)
{
return(default(T));
}
BindingFlags flags = overrideSettings?.Any(s => s.IncludeNonPublic) ?? true
? BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance
: BindingFlags.Public | BindingFlags.Instance;
while (type != null)
{
List <ICopyOverrideSettings> currentSettings = overrideSettings?.Where(s => s.ContainingClassType.IsAssignableFrom(type))
.ToList() ?? new List <ICopyOverrideSettings>();
foreach (FieldInfo field in type.GetFields(flags))
{
shouldSkip = false;
shouldSkip = CheckIfShouldSkip(overrideSettings, field?.FieldType?.FullName, shouldSkip);
if (shouldSkip || ShouldSkipDotNet(type, field.FieldType, field.Name))
{
continue;
}
object value = field.GetValue(instance);
ICopyOverrideSettings currentOverride = currentSettings.SingleOrDefault(s => s.FieldValueOverrideType.IsAssignableFrom(field.FieldType) &&
s.ContainingClassType.IsAssignableFrom(type) &&
s.AffectedFieldName == field.Name);
try
{
if (currentOverride != null)
{
if (!currentOverride.ShouldSkipOverrideInsteadOfSet)
{
var settableValue = currentOverride.UseFieldValueOverrideFunction
? currentOverride.FieldValueOverrideFunction(instance)
: currentOverride.FieldValueOverride;
field.SetValue(copy, settableValue);
if (currentOverride.OnlyOverrideFirst)
{
overrideSettings.Remove(overrideSettings.Single(s => s.AffectedFieldName == s.AffectedFieldName &&
s.ContainingClassType == s.ContainingClassType && s.FieldValueOverride == s.FieldValueOverride &&
s.FieldValueOverrideType == s.FieldValueOverrideType && s.OnlyOverrideFirst == s.OnlyOverrideFirst));
}
}
}
else if (ShouldUseVisitedGraph(overrideSettings) && visited.ContainsKey(value))
{
var settableValue = visited[value];
field.SetValue(copy, settableValue);
}
else
{
var settableValue = value.Clone(visited, field.FieldType, overrideSettings);
field.SetValue(copy, settableValue);
}
}
catch (Exception ex)
{
if (ShouldThrow(overrideSettings, field?.FieldType?.FullName, true, ex))
{
throw;
}
}
}
foreach (PropertyInfo propertyInfo in type.GetProperties(flags))
{
if (!propertyInfo.CanRead || !propertyInfo.CanWrite)
{
continue;
}
shouldSkip = false;
shouldSkip = CheckIfShouldSkip(overrideSettings, propertyInfo?.PropertyType?.FullName, shouldSkip);
ParameterInfo[] propParameters = propertyInfo.GetIndexParameters();
if (!shouldSkip && propParameters?.Where(pp => !pp.IsOptional).Count() > 0)
{
shouldSkip = true;
}
if (shouldSkip || ShouldSkipDotNet(type, propertyInfo.PropertyType, propertyInfo.Name))
{
continue;
}
object value = propertyInfo.GetValue(instance);
ICopyOverrideSettings currentOverride = currentSettings.SingleOrDefault(s => s.FieldValueOverrideType.IsAssignableFrom(propertyInfo.PropertyType) &&
s.ContainingClassType.IsAssignableFrom(type) &&
s.AffectedFieldName == propertyInfo.Name);
try
{
if (currentOverride != null)
{
if (!currentOverride.ShouldSkipOverrideInsteadOfSet)
{
var settableValue = currentOverride.UseFieldValueOverrideFunction
? currentOverride.FieldValueOverrideFunction(instance)
: currentOverride.FieldValueOverride;
propertyInfo.SetValue(copy, settableValue);
if (currentOverride.OnlyOverrideFirst)
{
overrideSettings.Remove(overrideSettings.Single(s => s.AffectedFieldName == s.AffectedFieldName &&
s.ContainingClassType == s.ContainingClassType && s.FieldValueOverride == s.FieldValueOverride &&
s.FieldValueOverrideType == s.FieldValueOverrideType && s.OnlyOverrideFirst == s.OnlyOverrideFirst));
}
}
}
else if (ShouldUseVisitedGraph(overrideSettings) && visited.ContainsKey(value))
{
var settableValue = visited[value];
propertyInfo.SetValue(copy, settableValue);
}
else
{
var settableValue = value.Clone(visited, propertyInfo.PropertyType, overrideSettings);
propertyInfo.SetValue(copy, settableValue);
}
}
catch (Exception ex)
{
if (ShouldThrow(overrideSettings, propertyInfo?.PropertyType?.FullName, true, ex))
{
throw;
}
}
}
type = type.BaseType;
}
// call the post copy actions
if (overrideSettings?.Any(s => s?.PostCopyActions != null) ?? false)
{
foreach (ICopyOverrideSettings setting in overrideSettings)
{
if (!(setting?.PostCopyActions?.Any() ?? false))
{
continue;
}
// try the exact post copy action
if (setting.PostCopyActions.ContainsKey(copy.GetType()))
{
setting.PostCopyActions[copy.GetType()](instance, copy, expectedType);
}
// try the default post copy action
else if (setting.PostCopyActions.ContainsKey(setting.DefaultPostActionType))
{
setting.PostCopyActions[setting.DefaultPostActionType](instance, copy, expectedType);
}
}
}
return(copy);
}
/// <summary>
/// Creates a deep copy of an object using the supplied dictionary of visited objects as
/// a source of objects already encountered in the copy traversal. The dictionary of visited
/// objects is used for holding objects that have already been copied, to avoid erroneous
/// duplication of parts of the object graph.
/// </summary>
/// <param name="instance">The object to be copied.</param>
/// <param name="visited">The graph of objects visited so far.</param>
/// <param name="expectedType">The type that should be found.</param>
/// <param name="overrideSettings">Settings to override the copy logic.</param>
/// <typeparam name="T">The type of the instance given.</typeparam>
/// <returns>The copied object.</returns>
private static T Clone <T>(this T instance, VisitedGraph visited, Type expectedType, IList <ICopyOverrideSettings> overrideSettings = null)
{
if (instance == null)
{
return(default(T));
}
Type instanceType = instance.GetType();
string instanceTypeNameString = instanceType.FullName;
bool shouldSkip = false;
shouldSkip = CheckIfShouldSkip(overrideSettings, instanceType.FullName, false);
if (shouldSkip)
{
return(default(T));
}
if (typeof(Type).IsAssignableFrom(instanceType))
{
return(instance);
}
Tuple <bool, T> primitiveValue = instance.DeduceInstanceForTypeIfValueType();
if (primitiveValue.Item1)
{
return(primitiveValue.Item2);
}
if (instanceType.IsArray)
{
int length = ((Array)(object)instance).Length;
Array copied = (Array)Activator.CreateInstance(instanceType, length);
if (ShouldUseVisitedGraph(overrideSettings))
{
visited.Add(instance, copied);
}
Type elementType = instance.GetType().GetElementType();
bool gotARealType = elementType != null;
if (!gotARealType)
{
for (int i = 0; i < length || gotARealType; i++)
{
object current = ((Array)(object)instance).GetValue(i);
if (current != null)
{
elementType = current.GetType();
gotARealType = true;
}
}
}
for (int i = 0; i < length; ++i)
{
object current = ((Array)(object)instance).GetValue(i);
copied.SetValue(current.Clone(visited, gotARealType ? elementType : current?.GetType(), overrideSettings), i);
}
return((T)(object)copied);
}
else if (typeof(IList).IsAssignableFrom(instanceType))
{
IList copied = (IList)Activator.CreateInstance(instanceType);
Type elementType = null;
bool gotAType = false;
if (instanceType.IsGenericType)
{
elementType = instanceType.GetGenericArguments().Single();
gotAType = true;
}
if (!gotAType)
{
elementType = instance.GetType().GetElementType();
gotAType = true;
}
if (ShouldUseVisitedGraph(overrideSettings))
{
visited.Add(instance, copied);
}
foreach (object item in (IList)instance)
{
object clonedItem = item.Clone(visited, elementType, overrideSettings);
copied.Add(clonedItem);
}
return((T)(object)copied);
}
else if (typeof(IDictionary).IsAssignableFrom(instanceType))
{
return(Clone(instance, visited, DeduceInstance(instance), expectedType, overrideSettings));
}
else if (typeof(IEnumerable).IsAssignableFrom(instanceType))
{
// This isn't a fully featured solution IEnumerable and ICollection can still be left out
Type[] arguments = instanceType.GenericTypeArguments;
IEnumerable copied = (IEnumerable)DeduceInstance(instance);
if (ShouldUseVisitedGraph(overrideSettings))
{
visited.Add(instance, copied);
}
List <object> test = new List <object>();
MethodInfo castMethod = typeof(Enumerable).GetMethod("Cast", BindingFlags.Static | BindingFlags.Public);
MethodInfo castGenericMethod = castMethod.MakeGenericMethod(arguments);
IEnumerable <dynamic> casted = (dynamic)castGenericMethod.Invoke(null, new object[] { ((IEnumerable)instance) });
copied = ((IEnumerable)instance).Cast <dynamic>().ToList().AsEnumerable();
return((T)(object)copied);
}
else if (typeof(DateTime).IsAssignableFrom(instanceType))
{
if (((DateTime)(object)instance) == DateTime.MinValue)
{
// This is a min value allowed by SQL Server for some datetime fields
return((T)(object)(new DateTime(1753, 1, 1)));
}
}
return(Clone(instance, visited, DeduceInstance(instance), expectedType, overrideSettings));
}
private static object Clone(this object instance, VisitedGraph visited, object copy)
{
if (visited.ContainsKey(instance))
return visited[instance];
else
visited.Add(instance, copy);
Type type = instance.GetType();
while (type != null)
{
foreach (FieldInfo field in type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
{
object value = field.GetValue(instance);
if (visited.ContainsKey(value))
field.SetValue(copy, visited[value]);
else
field.SetValue(copy, value.Clone(visited));
}
type = type.BaseType;
}
return copy;
}
/// <summary>
/// Creates a deep copy of an object using the supplied dictionary of visited objects as
/// a source of objects already encountered in the copy traversal. The dictionary of visited
/// objects is used for holding objects that have already been copied, to avoid erroneous
/// duplication of parts of the object graph.
/// </summary>
/// <param name="instance">The object to be copied.</param>
/// <param name="visited">The graph of objects visited so far.</param>
/// <returns></returns>
private static object Clone(this object instance, VisitedGraph visited)
{
if (instance == null)
return null;
Type instanceType = instance.GetType();
if(typeof(Type).IsAssignableFrom(instanceType))
{
return instance;
}
if (instanceType.IsPointer || instanceType == typeof(Pointer) || instanceType.IsPrimitive || instanceType == typeof(string))
return instance; // Pointers, primitive types and strings are considered immutable
if (instanceType.IsArray)
{
int length = ((Array)instance).Length;
Array copied = (Array)Activator.CreateInstance(instanceType, length);
visited.Add(instance, copied);
for (int i = 0; i < length; ++i)
copied.SetValue(((Array)instance).GetValue(i).Clone(visited), i);
return copied;
}
return Clone(instance, visited, DeduceInstance(instance));
}
