private static MethodInfo MakeConcreteMethod(MethodInfo method, LinkList <Type> openArguments, LinkList <Binding> bindings)
{
Debug.Assert(method != null);
Debug.Assert(openArguments != null);
Debug.Assert(bindings != null);
// If the method is not generic, return it immediately.
if (!method.IsGenericMethodDefinition)
{
Debug.Assert(openArguments.IsEmpty);
return(method);
}
// Otherwise, retrieve bindings for open arguments and construct the method.
var boundArguments = GenericTypeResolver.BindConcreteArguments(openArguments, bindings);
var concreteMethod = (boundArguments.Length == openArguments.Count
? method.MakeGenericMethod(boundArguments)
: null);
return(concreteMethod);
}
private static Type MakeConcreteType(Type genericType, LinkList <Type> openArguments, LinkList <Binding> bindings)
{
Debug.Assert(genericType != null);
Debug.Assert(openArguments != null);
Debug.Assert(bindings != null);
// If the type is concrete, return it immediately.
if (!genericType.ContainsGenericParameters)
{
Debug.Assert(openArguments.IsEmpty);
return(genericType);
}
// Otherwise, retrieve bindings for open arguments and construct the type.
var boundArguments = GenericTypeResolver.BindConcreteArguments(openArguments, bindings);
Debug.Assert(boundArguments.Length <= openArguments.Count);
var concreteType = (boundArguments.Length == openArguments.Count
? genericType.MakeGenericType(boundArguments)
: null);
return(concreteType);
}
private static BindingCollection GetConcreteTypeBindings(Type type, LinkList <Binding> bindings, out LinkList <Type> openArguments)
{
Debug.Assert(type != null);
Debug.Assert(bindings != null);
// Avoid recursive searches for generic type.
if (type.ContainsGenericParameters)
{
if (Binding.ContainsType(bindings, type))
{
openArguments = LinkList <Type> .Empty;
return(new BindingCollection( ));
}
bindings = bindings.Add(new Binding(null, type));
}
// Bind all unassigned generic argument on the generic type.
openArguments = GenericTypeResolver.GetOpenGenericArguments(type);
var collection = new BindingCollection(bindings);
GenericTypeResolver.BindGenericArguments(collection, openArguments);
return(collection);
}
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);
}
protected override IEnumerable <LinkList <Binding> > SatisfyCore(Type availableType, LinkList <Binding> bindings)
{
if (this.condition_(availableType))
{
return(bindings.MakeEnumerable( ));
}
return(Constraint.NoBindings);
}
public static MethodInfo MakeConcreteMethod(MethodInfo method, LinkList <Binding> bindings)
{
var openArguments = GenericTypeResolver.GetOpenGenericArguments(method.GetGenericArguments( ));
return(GenericTypeResolver.MakeConcreteMethod(method, openArguments, bindings));
}
public static Type MakeConcreteType(Type genericType, LinkList <Binding> bindings)
{
var openArguments = GenericTypeResolver.GetOpenGenericArguments(genericType);
return(GenericTypeResolver.MakeConcreteType(genericType, openArguments, bindings));
}
public static ReadOnlyCollection <Type> GetConcreteTypes(Type genericType, LinkList <Binding> bindings)
{
return(GenericTypeResolver.GetConcreteTypesCore(genericType, bindings));
}
/// <summary>
/// Creates an instance of the <paramref name="genericType"/> by assigning each of the <paramref name="openArguments"/>
/// to the concrete type specified by the <paramref name="bindings"/>.
/// </summary>
public static Type CreateConcreteType(Type genericType, LinkList <Type> openArguments, LinkList <Binding> bindings)
{
return(GenericTypeResolver.MakeConcreteType(genericType, openArguments, bindings));
}
private static IEnumerable <T[]> Permute <T>(LinkList <LinkList <T> > availableItems, LinkList <T> currentPermutation)
{
// If there are no remaining available items, return current permutation.
if (availableItems.IsEmpty)
{
return(currentPermutation.ToArray( ).MakeEnumerable( ));
}
// Otherwise, loop through all of the current available items,
// returning permutations of the remaining items.
var currentAvailableItems = availableItems.Value;
var remainingAvailableItems = availableItems.Tail;
Debug.Assert(currentAvailableItems != null);
return
(from item in currentAvailableItems
let nextPermutation = currentPermutation.Add(item)
from permutation in Permuter.Permute(remainingAvailableItems, nextPermutation)
select permutation);
}
/// <summary>
/// Adds the specified bindings to the collection.
/// </summary>
public void Add(LinkList <Binding> bindings)
{
Debug.Assert(bindings != null);
this.bindings_.Add(bindings);
}
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);
}
private static ReadOnlyCollection <Type> GetConcreteTypesCore(Type genericType, LinkList <Binding> bindings)
{
Debug.Assert(genericType != null);
Debug.Assert(bindings != null);
bool cached = concreteTypeCache_.ContainsKey(genericType);
bool unbound = genericType.GetGenericArguments( )
.All((a) => !Binding.ContainsArgument(bindings, a));
// If the type has already been evaluated and there are no interfering bindings, return cached value.
if (cached && unbound)
{
return(concreteTypeCache_[genericType]);
}
// Otherwise, get a concrete type for each set of bindings.
LinkList <Type> openArguments;
BindingCollection concreteTypeBindngs = GenericTypeResolver.GetConcreteTypeBindings(genericType, bindings, out openArguments);
var concreteTypes = concreteTypeBindngs
.Transform((argumentBindings) => MakeConcreteType(genericType, openArguments, argumentBindings))
.ToReadOnlyCollection( );
// If there are no interfering bindings, cache the concrete types.
if (!cached && unbound)
{
concreteTypeCache_.TryAdd(genericType, concreteTypes);
concreteTypes = concreteTypeCache_[genericType];
}
return(concreteTypes);
}
/// <summary> /// Implements the logic behind <see cref="Constraint.Satisfy"/>. /// </summary> protected abstract IEnumerable <LinkList <Binding> > SatisfyCore(Type availableType, LinkList <Binding> bindings);
