protected override void VisitList(
IList <object> list,
ConverterContext context)
{
Type elementType = DotNetTypeInfoFactory
.GetInnerListType(context.ClrType);
if (elementType != null)
{
Type listType = typeof(List <>).MakeGenericType(elementType);
IList temp = (IList)Activator.CreateInstance(listType);
for (int i = 0; i < list.Count; i++)
{
var valueContext = new ConverterContext();
valueContext.ClrType = elementType;
Visit(list[i], valueContext);
temp.Add(valueContext.Object);
}
context.Object = context.ClrType.IsAssignableFrom(listType)
? temp
: _converter.Convert(listType, context.ClrType, temp);
}
}
private bool TryCreateListTypeConverter(Type from, Type to,
out ChangeType listConverter)
{
Type fromElement = DotNetTypeInfoFactory.GetInnerListType(from);
Type toElement = DotNetTypeInfoFactory.GetInnerListType(to);
if (fromElement != null && toElement != null &&
TryGetOrCreateConverter(fromElement, toElement,
out ChangeType converter))
{
if (to.IsArray)
{
listConverter = source => GenericArrayConverter(
toElement, (ICollection)source, converter);
Register(from, to, listConverter);
}
else
{
Type listType = to.IsInterface
? typeof(List <>).MakeGenericType(toElement)
: to;
listConverter = source => GenericListConverter(
listType, (ICollection)source, converter);
Register(from, to, listConverter);
}
return(true);
}
listConverter = null;
return(false);
}
public void Unwrap(Type type, Type expectedReducedType)
{
// arrange
// act
Type reducedType = DotNetTypeInfoFactory.Unwrap(type);
// assert
Assert.Equal(expectedReducedType, reducedType);
}
public bool TryCreateConverter(
Type source,
Type target,
ChangeTypeProvider root,
[NotNullWhen(true)] out ChangeType?converter)
{
Type sourceElement = DotNetTypeInfoFactory.GetInnerListType(source);
Type targetElement = DotNetTypeInfoFactory.GetInnerListType(target);
if (sourceElement != null &&
targetElement != null &&
root(sourceElement, targetElement, out ChangeType? elementConverter))
{
if (target.IsArray)
{
converter = input => GenericArrayConverter(
(ICollection?)input, targetElement, elementConverter);
return(true);
}
if (target.IsGenericType &&
target.GetGenericTypeDefinition() == typeof(Dictionary <,>))
{
MethodInfo converterMethod =
_dictionaryConvert.MakeGenericMethod(targetElement.GetGenericArguments());
converter = source => converterMethod.Invoke(
null, new[] { source, elementConverter });
return(true);
}
if (target.IsGenericType &&
target.IsInterface)
{
Type listType = typeof(List <>).MakeGenericType(targetElement);
if (target.IsAssignableFrom(listType))
{
converter = source => GenericListConverter(
(ICollection?)source, listType, elementConverter);
return(true);
}
}
if (target.IsGenericType &&
target.IsClass &&
typeof(ICollection).IsAssignableFrom(target))
{
converter = source => GenericListConverter(
(ICollection?)source, target, elementConverter);
return(true);
}
}
converter = null;
return(false);
}
public void NotSupportedCases(Type clrType)
{
// arrange
var factory = new DotNetTypeInfoFactory();
// act
bool success = factory.TryCreate(clrType, out TypeInfo typeInfo);
// assert
Assert.False(success);
}
public void CreateTypeInfoFromValueType(Type nativeType, string expectedTypeName)
{
// arrange
DotNetTypeInfoFactory factory = new DotNetTypeInfoFactory();
// act
bool success = factory.TryCreate(nativeType, out TypeInfo typeInfo);
// assert
Assert.True(success);
Assert.Equal(expectedTypeName, typeInfo.TypeFactory(new IntType()).Visualize());
}
public void MixedTypes(Type clrType, string expectedTypeName)
{
// arrange
var factory = new DotNetTypeInfoFactory();
// act
bool success = factory.TryCreate(clrType, out TypeInfo typeInfo);
// assert
Assert.True(success);
Assert.Equal(expectedTypeName,
typeInfo.TypeFactory(new StringType()).Visualize());
}
public void Rewrite(
Type type,
bool isNonNullType,
bool isElementNonNullType,
Type expectedReducedType)
{
// arrange
// act
Type reducedType = DotNetTypeInfoFactory.Rewrite(
type, isNonNullType, isElementNonNullType);
// assert
Assert.Equal(expectedReducedType, reducedType);
}
private bool TryCreateListTypeConverter(Type from, Type to,
out ChangeType listConverter)
{
Type fromElement = DotNetTypeInfoFactory.GetInnerListType(from);
Type toElement = DotNetTypeInfoFactory.GetInnerListType(to);
if (fromElement != null && toElement != null &&
TryGetOrCreateConverter(fromElement, toElement,
out ChangeType converter))
{
if (to.IsArray)
{
listConverter = source => GenericArrayConverter(
toElement, (ICollection)source, converter);
Register(from, to, listConverter);
}
else if (to.IsGenericType &&
to.GetGenericTypeDefinition() == typeof(Dictionary <,>))
{
MethodInfo converterMethod =
_dictionaryConvert.MakeGenericMethod(toElement.GetGenericArguments());
listConverter = source => converterMethod.Invoke(
null, new[] { source, converter });
Register(from, to, listConverter);
}
else
{
Type listType = to.IsInterface
? typeof(List <>).MakeGenericType(toElement)
: to;
listConverter = source => GenericListConverter(
listType, (ICollection)source, converter);
Register(from, to, listConverter);
}
return(true);
}
listConverter = null;
return(false);
}
public void Create_TypeInfo_From_RewrittenType()
{
// arrange
Type type = typeof(ListType <NonNullType <NativeType <string> > >);
var factory = new DotNetTypeInfoFactory();
// act
bool success = factory.TryCreate(type, out TypeInfo typeInfo);
// assert
Assert.True(success);
Assert.Collection(typeInfo.Components,
t => Assert.Equal(typeof(ListType <NonNullType <NativeType <string> > >), t),
t => Assert.Equal(typeof(NonNullType <NativeType <string> >), t),
t => Assert.Equal(typeof(string), t));
IType schemaType = typeInfo.TypeFactory(new StringType());
Assert.IsType <StringType>(
Assert.IsType <NonNullType>(
Assert.IsType <ListType>(schemaType).ElementType).Type);
}