/// <summary>
/// Returns bindings for all assigned generic arguments in the specified list of bindings.
/// </summary>
public static void GetAssignedGenericArguments(BindingCollection bindings, Type concreteType, Type genericType)
{
Debug.Assert(bindings != null);
Debug.Assert(concreteType != null);
Debug.Assert(genericType != null);
Debug.Assert(concreteType.Is(genericType));
IEnumerable <Tuple <Type, Type> > concreteTypes = GetConcreteTypes(concreteType, genericType);
bindings.Expand(concreteTypes, (currentBindings, tuple) => {
Type type = tuple.Item1;
Type generic = tuple.Item2;
Type[] assignedArguments = type.GetGenericArguments( );
Type[] unassignedArguments = generic.GetGenericArguments( );
Debug.Assert(assignedArguments.Length == unassignedArguments.Length);
for (int i = 0; currentBindings.Count > 0 && i < unassignedArguments.Length; ++i)
{
Type unassignedArgument = unassignedArguments[i];
Type assignedArgument = assignedArguments[i];
if (assignedArgument.IsGenericParameter)
{
continue;
}
if (!unassignedArgument.IsGenericParameter)
{
if (unassignedArgument.ContainsGenericParameters)
{
GenericTypeResolver.GetAssignedGenericArguments(currentBindings, assignedArgument, unassignedArgument);
}
continue;
}
if (!assignedArgument.Is(unassignedArgument))
{
currentBindings.Clear( );
break;
}
currentBindings.Reduce(b => {
Binding existingBinding = Binding.ForArgument(b, unassignedArgument);
return(existingBinding == null
? b.Add(new Binding(unassignedArgument, assignedArgument))
: (existingBinding.Type == assignedArgument ? b : null));
});
}
if (genericType.IsGenericParameter)
{
currentBindings.Reduce(b => b.Add(new Binding(genericType, concreteType)));
}
});
}
private static IEnumerable <IInstanceCreator> GetMethodCreators(Type targetType, MethodBase method)
{
Debug.Assert(targetType != null);
Debug.Assert(method != null);
Debug.Assert(method.IsGenericMethod || !targetType.ContainsGenericParameters);
// Ignore recursive parameters.
var parameters = method.GetParameters( );
if (parameters.Any(p => p.ParameterType.Is(targetType) || p.ParameterType.Is(method.DeclaringType)))
{
yield break;
}
// Retrieve creators for each parameter.
var availableArguments = parameters.Select((p) => TypeCreator.GetInstanceCreators(p.ParameterType).AsEnumerable( ));
// Call constructor with all argument permutations.
foreach (var arguments in Permuter.Permute(availableArguments))
{
// If method is concrete, use it.
if (!method.IsGenericMethod)
{
yield return(WeakInstanceCreator.ForMethod(targetType, method, arguments));
}
// Otherwise, try to resolve generic arguments on method.
else if (method is MethodInfo)
{
var methodInfo = (MethodInfo)method;
var bindings = new BindingCollection(Binding.EmptyBindings);
for (int i = 0; i < parameters.Length; ++i)
{
ParameterInfo parameter = parameters[i];
IInstanceCreator argument = arguments[i];
if (parameter.ParameterType.ContainsGenericParameters)
{
GenericTypeResolver.GetAssignedGenericArguments(bindings, argument.InstanceType, parameter.ParameterType);
}
}
foreach (LinkList <Binding> b in bindings)
{
var concreteMethod = GenericTypeResolver.MakeConcreteMethod(methodInfo, b);
if (concreteMethod != null)
{
targetType = concreteMethod.ReturnType;
yield return(WeakInstanceCreator.ForMethod(targetType, concreteMethod, arguments));
}
}
}
}
}
private static IEnumerable <IInstanceCreator> GetConstructorCreators(Type targetType, Type availableType)
{
Debug.Assert(targetType != null);
Debug.Assert(availableType != null);
Debug.Assert(!availableType.IsAbstract);
if (targetType.ContainsGenericParameters)
{
Type definition = targetType.IsGenericParameter ? targetType : targetType.GetGenericTypeDefinition( );
var bindings = new BindingCollection(Binding.EmptyBindings);
GenericTypeResolver.GetAssignedGenericArguments(bindings, availableType, definition);
foreach (var binding in bindings)
{
Type resolvedType =
definition.IsGenericParameter
? Binding.ForArgument(binding, definition).Type
: GenericTypeResolver.MakeConcreteType(definition, binding);
targetType = resolvedType;
break;
}
}
var creators = new List <IInstanceCreator>( );
// If type is an enumeration, get creator for enum values.
if (availableType.IsEnum || availableType == typeof(bool))
{
creators.AddRange(WeakInstanceCreator.ForEnum(availableType));
}
// Otherwise, get creator for any default constructor.
else if (Constraint.HasDefaultConstructor(availableType))
{
creators.Add(WeakInstanceCreator.ForType(availableType));
}
// Get creators for any parameterized constructors.
var parameterizedConstructors = availableType.GetConstructors( ).Where((c) => c.GetParameters( ).Length > 0).ToArray( );
if (parameterizedConstructors.Length < 3)
{
foreach (var constructor in parameterizedConstructors)
{
creators.AddRange(TypeCreator.GetMethodCreators(targetType, constructor));
}
}
return(creators);
}
private static ICollection <MethodInfo> GetConcreteMethods(MethodInfo method, LinkList <Binding> bindings)
{
Debug.Assert(method != null);
Debug.Assert(bindings != null);
// Try to resolve generic arguments on method.
var openArguments = GenericTypeResolver.GetOpenGenericArguments(method.GetGenericArguments( ));
var concreteBindings = new BindingCollection(bindings);
GenericTypeResolver.BindGenericArguments(concreteBindings, openArguments);
var concreteMethods = concreteBindings.Transform((b) => MakeConcreteMethod(method, openArguments, b));
// If generic arguments cannot be resolved statically, try to bind method arguments by searching for creatable parameter types.
if (concreteMethods.Count == 0)
{
var genericParameterTypes = method.GetParameters( )
.Select(p => p.ParameterType)
.Where(t => t.IsGenericType)
.ToArray( );
Debug.Assert(genericParameterTypes.All(t => !t.IsGenericParameter));
var creatableParameterTypes = genericParameterTypes
.Select(t => TypeCreator.GetCreators(t)
.Select(c => c.InstanceType)
.Distinct( )
);
var parameterBindings = new BindingCollection(bindings);
parameterBindings.Expand(Permuter.Permute(creatableParameterTypes), (b, permutation) => {
for (int i = 0; i < permutation.Length; ++i)
{
Type permutationType = permutation[i];
Type genericParameterType = genericParameterTypes[i];
GenericTypeResolver.GetAssignedGenericArguments(b, permutationType, genericParameterType);
}
});
concreteMethods = parameterBindings.Transform((b) => MakeConcreteMethod(method, openArguments, b));
}
return(concreteMethods);
}
protected override IEnumerable <LinkList <Binding> > SatisfyCore(Type availableType, LinkList <Binding> bindings)
{
var newBindings = new List <LinkList <Binding> >( );
var currentBindngs = new BindingCollection(bindings);
// Check if the available type derives from the base type.
if (availableType.Is(this.requiredBaseType_))
{
// Add any generic arguments assigned by the base type.
if (this.requiredBaseType_.IsGenericType && !this.requiredBaseType_.ContainsGenericParameters)
{
IEnumerable <Type> correspondingTypes = GenericTypeResolver.GetCorrespondingBaseTypes(availableType, this.requiredBaseType_);
foreach (Type correspondingType in correspondingTypes)
{
if (correspondingType.ContainsGenericParameters)
{
GenericTypeResolver.GetAssignedGenericArguments(currentBindngs, this.requiredBaseType_, correspondingType);
}
}
}
// Check all concrete version of the available type.
foreach (LinkList <Binding> b in currentBindngs)
{
var concreteTypes = GenericTypeResolver.GetConcreteTypes(availableType, b);
foreach (Type concreteAvailableType in concreteTypes)
{
// Add any newly assigned bindings from concrete and base types.
var assignedBindings = new BindingCollection(b);
GenericTypeResolver.GetAssignedGenericArguments(assignedBindings, concreteAvailableType, availableType);
if (this.requiredBaseType_.ContainsGenericParameters)
{
GenericTypeResolver.GetAssignedGenericArguments(assignedBindings, concreteAvailableType, this.requiredBaseType_);
}
newBindings.AddRange(assignedBindings);
}
}
}
return(newBindings);
}