/// <summary>
/// Performs a mapping operation from the <see cref="IEnumerable{IPublishedContent}"/> to a new <see cref="IEnumerable{Object}"/> instance
/// </summary>
/// <param name="content">The content to map</param>
/// <param name="type">The <see cref="Type"/> of items to return.</param>
/// <returns>
/// The converted <see cref="IEnumerable{Object}"/>.
/// </returns>
public static IEnumerable <object> MapTo(this IEnumerable <IPublishedContent> content, Type type)
{
IEnumerable <object> typedItems = content.Select(x => x.MapTo(type));
// We need to cast back here as nothing is strong typed anymore.
return((IEnumerable <object>)EnumerableInvocations.Cast(type, typedItems));
}
/// <inheritdoc/>
public override object Map(IPublishedContent content, object value)
{
Type propType = this.PropertyType;
bool propTypeIsEnumerable = propType.IsEnumerableType();
Type baseType = propTypeIsEnumerable ? propType.GetEnumerableType() : propType;
var types = (IEnumerable <Type>)ApplicationContext.Current.ApplicationCache.StaticCache.GetCacheItem("UmbMapperFactoryAttribute_ResolveTypes_" + baseType.AssemblyQualifiedName, () =>
{
// Workaround for http://issues.umbraco.org/issue/U4-9011
if (baseType.Assembly.IsAppCodeAssembly())
{
// This logic is taken from the core type finder so it should be performing the same checks
return(baseType.Assembly
.GetTypes()
.Where(t => baseType.IsAssignableFrom(t) &&
t.IsClass &&
!t.IsAbstract &&
!t.IsSealed &&
!t.IsNestedPrivate &&
t.GetCustomAttribute <HideFromTypeFinderAttribute>(true) == null)
.ToArray());
}
return(PluginManagerInvocations.ResolveTypes(baseType));
});
// Check for IEnumerable<IPublishedContent> value
if (value is IEnumerable <IPublishedContent> enumerableValue)
{
IEnumerable <object> items = enumerableValue.Select(x =>
{
string typeName = this.ResolveTypeName(x);
Type type = types.FirstOrDefault(y => y.Name.InvariantEquals(typeName));
return(type != null ? x.MapTo(type) : null);
});
return(EnumerableInvocations.Cast(baseType, items));
}
// Check for IPublishedContent value
if (value is IPublishedContent ipublishedContentValue)
{
string typeName = this.ResolveTypeName(ipublishedContentValue);
Type type = types.FirstOrDefault(y => y.Name.InvariantEquals(typeName));
return(type != null?ipublishedContentValue.MapTo(type) : null);
}
// No other possible options
return(this.DefaultValue);
}
private static object SantizeValue(object value, PropertyMapInfo info)
{
bool propertyIsCastableEnumerable = info.IsCastableEnumerableType;
bool propertyIsConvertableEnumerable = info.IsConvertableEnumerableType;
if (value != null)
{
Type valueType = value.GetType();
if (valueType == info.PropertyType)
{
return(value);
}
bool valueIsConvertableEnumerable = valueType.IsConvertableEnumerableType();
// You cannot set an enumerable of type from an empty object array.
// This should allow the casting back of IEnumerable<T> to an empty List<T> Collection<T> etc.
// I cant think of any that don't have an empty constructor
if (value.Equals(Enumerable.Empty <object>()) && propertyIsCastableEnumerable)
{
Type typeArg = info.PropertyType.GetTypeInfo().GenericTypeArguments.First();
return(info.PropertyType.IsInterface ? EnumerableInvocations.Cast(typeArg, (IEnumerable)value) : info.PropertyType.GetInstance());
}
// Ensure only a single item is returned when requested.
if (valueIsConvertableEnumerable && !propertyIsConvertableEnumerable)
{
// Property is not enumerable, but value is, so grab first item
IEnumerator enumerator = ((IEnumerable)value).GetEnumerator();
return(enumerator.MoveNext() ? enumerator.Current : null);
}
// And now check for the reverse situation.
if (!valueIsConvertableEnumerable && propertyIsConvertableEnumerable)
{
var array = Array.CreateInstance(value.GetType(), 1);
array.SetValue(value, 0);
return(array);
}
}
else
{
if (propertyIsCastableEnumerable)
{
if (info.PropertyType.IsInterface && !info.IsEnumerableOfKeyValueType)
{
// Value is null, but property is enumerable interface, so return empty enumerable
return(EnumerableInvocations.Empty(info.PropertyType.GenericTypeArguments.First()));
}
// Concrete enumerables cannot be cast from Array so we create an instance and return it
// if we know it has an empty constructor.
ParameterInfo[] constructorParams = info.PropertyType.GetConstructorParameters();
if (constructorParams != null && constructorParams.Length == 0)
{
// Internally this uses Activator.CreateInstance which is heavily optimized.
return(info.PropertyType.GetInstance());
}
}
}
return(value);
}
