/// <summary>
/// Sets all members of the given member.
/// </summary>
/// <typeparam name="T">The type to create an instance of.</typeparam>
/// <param name="options">Some create instance options.</param>
/// <param name="memberInformation">The current member.</param>
private static void SetAllMembers <T>(ICreateInstanceOptionsComplete <T> options, IMemberInformation memberInformation) where T : class
{
// Check if children should be set or not
if (!IncludeChildMembers(options, memberInformation))
{
return;
}
// Get the properties of the current member as member information
var propertyInfos = memberInformation.MemberType.GetPublicSettableProperties()
.GetMemberInformation(memberInformation);
propertyInfos.ForEach(x =>
{
// Check if member should be set or not
if (!IncludeMember(options, x))
{
return;
}
// Create member value
var value = GetValue(options, x);
x.PropertyInfo.SetValue(memberInformation.MemberObject, value, null);
// Set children of value (recursive call)
var currentMember = x as MemberInformation;
if (currentMember != null)
{
currentMember.MemberObject = value;
}
SetAllMembers(options, currentMember);
});
}
/// <summary>
/// Tries to create an array value for the given type.
/// </summary>
/// <typeparam name="T">The type of the instance to create.</typeparam>
/// <param name="options">Some create instance options.</param>
/// <param name="memberInformation">The member to check.</param>
/// <returns>Returns the created value, or null if the given type is not an array type.</returns>
private static Object TryCreateArrayValue <T>(ICreateInstanceOptionsComplete <T> options, IMemberInformation memberInformation) where T : class
{
// Check if member is an array type
if (!memberInformation.MemberType.IsArray)
{
return(null);
}
// Create the array
var elementType = memberInformation.MemberType.GetElementType();
var array = Array.CreateInstance(elementType, GetCollectionItemCount(options));
// Add items
var anonymousItemName = GetAnonymousItemName(options);
for (var i = 0; i < array.Length; i++)
{
var currentMember = new MemberInformation
{
MemberType = elementType,
MemberPath = $"{memberInformation.MemberPath}.{anonymousItemName}",
MemberName = anonymousItemName
};
// Get the value of the current array item.
var arrayItemValue = GetValue(options, currentMember);
currentMember.MemberObject = arrayItemValue;
SetAllMembers(options, currentMember);
array.SetValue(arrayItemValue, i);
}
return(array);
}
/// <summary>
/// Gets the matching factory for the given member.
/// </summary>
/// <exception cref="CreateInstanceException">Multiple matching factories found.</exception>
/// <typeparam name="T">The type of the instance to create.</typeparam>
/// <param name="options">Some create instance options.</param>
/// <param name="memberInformation">The member to check.</param>
/// <returns>Returns the matching factory, or null if no factory was found.</returns>
private static IInstanceFactory GetFactory <T>(ICreateInstanceOptionsComplete <T> options, IMemberInformation memberInformation) where T : class
{
// Get matching factory
var factory = GetExactlymatchingFactory(options, memberInformation);
if (factory != null)
{
return(factory);
}
// Try get inner type of null-able
var nullableType = memberInformation.MemberType.GetTypeFromNullable();
if (nullableType == null)
{
return(null);
}
// Update type
if (memberInformation is MemberInformation info)
{
info.MemberType = nullableType;
}
return(GetExactlymatchingFactory(options, memberInformation));
}
/// <summary>
/// Populates the given instance if it is a collection, based on the collection configuration.
/// </summary>
/// <typeparam name="T">The type of the instance to create.</typeparam>
/// <param name="options">Some create instance options.</param>
/// <param name="memberInformation">The member to check.</param>
/// <param name="collectionInstance">The instance to populate.</param>
/// <returns>Returns the populated or unmodified instance.</returns>
private static Object TryPopulateCollection <T>(ICreateInstanceOptionsComplete <T> options, IMemberInformation memberInformation, Object collectionInstance) where T : class
{
// Check if collection should get populated or not
if (!PopulateCollection(options) || collectionInstance == null)
{
return(collectionInstance);
}
// Check if type is collection type
if (!memberInformation.MemberType.ImplementsICollectionT())
{
return(collectionInstance);
}
// Get generic parameter type
var genericArgumentTypes = memberInformation
.MemberType
.GetGenericTypeArguments()
.ToArray();
// Get the add method
var addMethod = memberInformation.MemberType
.GetRuntimeMethod("Add", genericArgumentTypes);
// Add items
var anonymousItemName = GetAnonymousItemName(options);
var collectionCount = GetCollectionItemCount(options);
for (var i = 0; i < collectionCount; i++)
{
var addParameters = new List <Object>();
genericArgumentTypes
.ForEach(x =>
{
var currentMember = new MemberInformation
{
MemberType = x,
MemberPath = $"{memberInformation.MemberPath}.{anonymousItemName}",
MemberName = anonymousItemName
};
// Get the value for the current collection item.
var collectionItemValue = GetValue(options, currentMember);
currentMember.MemberObject = collectionItemValue;
SetAllMembers(options, currentMember);
addParameters.Add(collectionItemValue);
});
addMethod.Invoke(collectionInstance, addParameters.ToArray());
}
return(collectionInstance);
}
/// <summary>
/// Gets the number of items to create for a collection.
/// </summary>
/// <typeparam name="T">The type of the instance to create.</typeparam>
/// <param name="options">Some create instance options.</param>
/// <returns>Returns the number of items to create.</returns>
private static Int32 GetCollectionItemCount <T>(ICreateInstanceOptionsComplete <T> options) where T : class
{
//Return count of 0 if collection should net get populated
if (!PopulateCollection(options))
{
return(0);
}
var min = options.PopulateCollectionsMinCount ?? PopulateCollectionsMinCount;
var max = options.PopulateCollectionsMaxCount ?? PopulateCollectionsMaxCount;
return(RandomValueEx.GetRandomInt32(min, max));
}
/// <summary>
/// Gets a value for the given member.
/// </summary>
/// <exception cref="CreateInstanceException">Value creation failed.</exception>
/// <typeparam name="T">The type of the instance to create.</typeparam>
/// <param name="options">Some create instance options.</param>
/// <param name="memberInformation">The member to check.</param>
/// <returns>Returns the created value.</returns>
private static Object GetValue <T>(ICreateInstanceOptionsComplete <T> options, IMemberInformation memberInformation) where T : class
{
// Try get value from factory
var factory = GetFactory(options, memberInformation);
if (factory != null)
{
try
{
return(factory.CreateValue(memberInformation));
}
catch (Exception ex)
{
throw new CreateInstanceException("Factory has thrown exception.", ex, factory.ToString(), null, memberInformation);
}
}
// Try create array value
var value = TryCreateArrayValue(options, memberInformation);
if (value != null)
{
return(value);
}
// Create value (first try IEnumerable than anything else)
value = TryCreateCollectionValue(memberInformation);
// ReSharper disable once InvertIf
if (value == null)
{
try
{
value = CreateValueUsingAcrivator(memberInformation);
}
catch (Exception ex)
{
throw new CreateInstanceException($"Failed to create instance due to missing or invalid factory for type '{memberInformation.MemberType}'.",
ex,
null,
null,
memberInformation);
}
}
// Populate collection if collection (could be ICollection)
return(TryPopulateCollection(options, memberInformation, value));
}
/// <summary>
/// Creates the root instance.
/// </summary>
/// <exception cref="CreateInstanceException">Value creation failed.</exception>
/// <typeparam name="T">The type of the instance to create.</typeparam>
/// <param name="options">Some create instance options.</param>
/// <param name="memberInformation">The member to create.</param>
/// <returns>Returns the created value.</returns>
private static T CreateRootMember <T>(ICreateInstanceOptionsComplete <T> options, IMemberInformation memberInformation) where T : class
{
try
{
var value = GetValue(options, memberInformation);
return((T)value);
}
catch (Exception ex)
{
throw new CreateInstanceException($"Failed to create root object of type: {typeof(T).Name}.",
ex,
options.Factories.Concat(DefaultFactories)
.StringJoin(Environment.NewLine),
null,
memberInformation);
}
}
/// <summary>
/// Gets the matching factory for the given member.
/// </summary>
/// <exception cref="CreateInstanceException">Multiple matching factories found.</exception>
/// <typeparam name="T">The type of the instance to create.</typeparam>
/// <param name="options">Some create instance options.</param>
/// <param name="memberInformation">The member to check.</param>
/// <returns>Returns the matching factory, or null if no factory was found.</returns>
private static IInstanceFactory GetExactlymatchingFactory <T>(ICreateInstanceOptionsComplete <T> options, IMemberInformation memberInformation) where T : class
{
// Get factory from options
var matchingFactories = options.Factories.Where(x => RuleInspector.Inspect(x.SelectionRules, memberInformation) == MemberSelectionResult.IncludeMember)
.ToList();
if (matchingFactories.Count == 1)
{
return(matchingFactories.Single());
}
// Check if multiple factories have matched
if (matchingFactories.Any())
{
throw new CreateInstanceException(
$"Found multiple matching factories for member (in options). Type is '{memberInformation.MemberType}'. Please make sure only one factory matches the member.",
null,
options.Factories.StringJoin(Environment.NewLine),
null,
memberInformation);
}
// Get factory from default factories
matchingFactories = DefaultFactories.Where(x => RuleInspector.Inspect(x.SelectionRules, memberInformation) == MemberSelectionResult.IncludeMember)
.ToList();
if (matchingFactories.Count == 1)
{
return(matchingFactories.Single());
}
//Check if multiple factories have matched
if (matchingFactories.Any())
{
throw new CreateInstanceException(
$"Found multiple matching factories for member (in global configuration). Type is '{memberInformation.MemberType}'. Please make sure only one factory matches the member.",
null,
DefaultFactories.StringJoin(Environment.NewLine),
null,
memberInformation);
}
// No factory found
return(null);
}
public static T CreateInstance <T>([NotNull] this ICreateInstanceOptionsComplete <T> options) where T : class
{
options.ThrowIfNull(nameof(options));
//Create instance
var rootMemberInformation = new MemberInformation
{
MemberType = typeof(T),
MemberPath = String.Empty,
MemberName = String.Empty
};
var instance = CreateRootMember(options, rootMemberInformation);
rootMemberInformation.MemberObject = instance;
//Set each member of the created instance.
SetAllMembers(options, rootMemberInformation);
return(instance);
}
/// <summary> /// Gets the name for anonymous items. /// </summary> /// <typeparam name="T">The type of the instance to create.</typeparam> /// <param name="options">Some create instance options.</param> /// <returns>Returns the name to use.</returns> private static String GetAnonymousItemName <T>(ICreateInstanceOptionsComplete <T> options) where T : class => options.AnonymousItemName ?? AnonymousItemName;
/// <summary> /// Gets a value determining whether collections should get populated or not. /// </summary> /// <typeparam name="T">The type of the instance to create.</typeparam> /// <param name="options">Some create instance options.</param> /// <returns>Returns a value of true if collections should get populated or not.</returns> private static Boolean PopulateCollection <T>(ICreateInstanceOptionsComplete <T> options) where T : class => options.PopulateCollections ?? PopulateCollections;
/// <summary> /// Gets a value determining whether the children should be included or not. /// </summary> /// <exception cref="CreateInstanceException">No matching rule was found.</exception> /// <typeparam name="T">The type of the instance to create.</typeparam> /// <param name="options">Some create instance options.</param> /// <param name="memberInformation">The member to check.</param> /// <returns>Returns a value of true if the children should be included; otherwise, false.</returns> private static Boolean IncludeChildMembers <T>(ICreateInstanceOptionsComplete <T> options, IMemberInformation memberInformation) => ShouldMemberBeIncluded(memberInformation, options.MemberChildrenSelectionRules, DefaultMemberChildreSelectionRules);
