protected override ComposablePartDefinition CreatePart(Type partType, bool typeExplicitlyRequested)
{
Requires.NotNull(partType, nameof(partType));
var partTypeInfo = partType.GetTypeInfo();
// We want to ignore abstract classes, but we want to consider static classes.
// Static classes claim to be both abstract and sealed. So to ignore just abstract
// ones, we check that they are not sealed.
if (partTypeInfo.IsAbstract && !partTypeInfo.IsSealed)
{
return(null);
}
BindingFlags everythingLocal = BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic;
BindingFlags instanceLocal = BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
// If the type is abstract only find local static exports
var exportBindingFlags = everythingLocal;
if (partTypeInfo.IsAbstract)
{
exportBindingFlags &= ~BindingFlags.Instance;
}
var declaredMethods = partType.GetMethods(exportBindingFlags); // methods can only export, not import
var declaredProperties = partType.GetProperties(everythingLocal);
var declaredFields = partType.GetFields(everythingLocal);
var allLocalMembers = declaredMethods.Concat <MemberInfo>(declaredProperties).Concat(declaredFields);
var exportingMembers = from member in allLocalMembers
from export in member.GetAttributes <ExportAttribute>()
select new KeyValuePair <MemberInfo, ExportAttribute>(member, export);
var exportedTypes = from export in partTypeInfo.GetAttributes <ExportAttribute>()
select new KeyValuePair <MemberInfo, ExportAttribute>(partTypeInfo, export);
var inheritedExportedTypes = from baseTypeOrInterface in partType.GetInterfaces().Concat(partType.EnumTypeAndBaseTypes().Skip(1))
where baseTypeOrInterface != typeof(object)
from export in baseTypeOrInterface.GetTypeInfo().GetAttributes <InheritedExportAttribute>()
select new KeyValuePair <MemberInfo, ExportAttribute>(baseTypeOrInterface.GetTypeInfo(), export);
var exportsByMember = (from export in exportingMembers.Concat(exportedTypes).Concat(inheritedExportedTypes)
group export.Value by export.Key into exportsByType
select exportsByType).Select(g => new KeyValuePair <MemberInfo, ExportAttribute[]>(g.Key, g.ToArray())).ToArray();
if (exportsByMember.Length == 0)
{
return(null);
}
// Check for PartNotDiscoverable only after we've established it's an interesting part.
// This optimizes for the fact that most types have no exports, in which case it's not a discoverable
// part anyway. Checking for the PartNotDiscoverableAttribute first, which is rarely defined,
// doesn't usually pay for itself in terms of short-circuiting. But it does add an extra
// attribute to look for that we don't need to find for all the types that have no export attributes either.
if (!typeExplicitlyRequested && partTypeInfo.IsAttributeDefined <PartNotDiscoverableAttribute>())
{
return(null);
}
foreach (var exportingMember in exportsByMember)
{
this.ThrowOnInvalidExportingMember(exportingMember.Key);
}
TypeRef partTypeRef = TypeRef.Get(partType, this.Resolver);
Type partTypeAsGenericTypeDefinition = partTypeInfo.IsGenericType ? partType.GetGenericTypeDefinition() : null;
// Collect information for all imports.
var imports = ImmutableList.CreateBuilder <ImportDefinitionBinding>();
this.AddImportsFromMembers(declaredProperties, declaredFields, partTypeRef, imports);
Type baseType = partTypeInfo.BaseType;
while (baseType != null && baseType != typeof(object))
{
this.AddImportsFromMembers(baseType.GetProperties(instanceLocal), baseType.GetFields(instanceLocal), partTypeRef, imports);
baseType = baseType.GetTypeInfo().BaseType;
}
var partCreationPolicy = CreationPolicy.Any;
var partCreationPolicyAttribute = partTypeInfo.GetFirstAttribute <PartCreationPolicyAttribute>();
if (partCreationPolicyAttribute != null)
{
partCreationPolicy = (CreationPolicy)partCreationPolicyAttribute.CreationPolicy;
}
var allExportsMetadata = ImmutableDictionary.CreateRange(PartCreationPolicyConstraint.GetExportMetadata(partCreationPolicy));
var inheritedExportContractNamesFromNonInterfaces = ImmutableHashSet.CreateBuilder <string>();
var exportDefinitions = ImmutableList.CreateBuilder <KeyValuePair <MemberInfo, ExportDefinition> >();
foreach (var export in exportsByMember)
{
var memberExportMetadata = allExportsMetadata.AddRange(GetExportMetadata(export.Key));
if (export.Key is MethodInfo)
{
var method = export.Key as MethodInfo;
var exportAttributes = export.Value;
if (exportAttributes.Any())
{
foreach (var exportAttribute in exportAttributes)
{
Type exportedType = exportAttribute.ContractType ?? ReflectionHelpers.GetContractTypeForDelegate(method);
string contractName = string.IsNullOrEmpty(exportAttribute.ContractName) ? GetContractName(exportedType) : exportAttribute.ContractName;
var exportMetadata = memberExportMetadata
.Add(CompositionConstants.ExportTypeIdentityMetadataName, ContractNameServices.GetTypeIdentity(exportedType));
var exportDefinition = new ExportDefinition(contractName, exportMetadata);
exportDefinitions.Add(new KeyValuePair <MemberInfo, ExportDefinition>(export.Key, exportDefinition));
}
}
}
else
{
MemberInfo exportingTypeOrPropertyOrField = export.Key;
Verify.Operation(export.Key is TypeInfo || !partTypeInfo.IsGenericTypeDefinition, Strings.ExportsOnMembersNotAllowedWhenDeclaringTypeGeneric);
Type exportSiteType = ReflectionHelpers.GetMemberType(exportingTypeOrPropertyOrField);
foreach (var exportAttribute in export.Value)
{
Type exportedType = exportAttribute.ContractType ?? partTypeAsGenericTypeDefinition ?? exportSiteType;
string contractName = string.IsNullOrEmpty(exportAttribute.ContractName) ? GetContractName(exportedType) : exportAttribute.ContractName;
if (export.Key is TypeInfo && exportAttribute is InheritedExportAttribute)
{
if (inheritedExportContractNamesFromNonInterfaces.Contains(contractName))
{
// We already have an export with this contract name on this type (from a more derived type)
// using InheritedExportAttribute.
continue;
}
if (!((TypeInfo)export.Key).IsInterface)
{
inheritedExportContractNamesFromNonInterfaces.Add(contractName);
}
}
var exportMetadata = memberExportMetadata
.Add(CompositionConstants.ExportTypeIdentityMetadataName, ContractNameServices.GetTypeIdentity(exportedType));
var exportDefinition = new ExportDefinition(contractName, exportMetadata);
exportDefinitions.Add(new KeyValuePair <MemberInfo, ExportDefinition>(export.Key, exportDefinition));
}
}
}
MethodInfo onImportsSatisfied = null;
if (typeof(IPartImportsSatisfiedNotification).IsAssignableFrom(partType))
{
onImportsSatisfied = OnImportsSatisfiedMethodInfo;
}
var importingConstructorParameters = ImmutableList.CreateBuilder <ImportDefinitionBinding>();
var importingCtor = GetImportingConstructor <ImportingConstructorAttribute>(partType, publicOnly: false);
if (importingCtor != null) // some parts have exports merely for metadata -- they can't be instantiated
{
foreach (var parameter in importingCtor.GetParameters())
{
var import = this.CreateImport(parameter);
if (import.ImportDefinition.Cardinality == ImportCardinality.ZeroOrMore)
{
Verify.Operation(PartDiscovery.IsImportManyCollectionTypeCreateable(import), Strings.CollectionMustBePublicAndPublicCtorWhenUsingImportingCtor);
}
importingConstructorParameters.Add(import);
}
}
var partMetadata = ImmutableDictionary.CreateBuilder <string, object>();
foreach (var partMetadataAttribute in partTypeInfo.GetAttributes <PartMetadataAttribute>())
{
partMetadata[partMetadataAttribute.Name] = partMetadataAttribute.Value;
}
var exportsOnType = exportDefinitions.Where(kv => kv.Key is TypeInfo).Select(kv => kv.Value).ToArray();
var exportsOnMembers = (from kv in exportDefinitions
where !(kv.Key is TypeInfo)
group kv.Value by kv.Key into byMember
select byMember).ToDictionary(g => MemberRef.Get(g.Key, this.Resolver), g => (IReadOnlyCollection <ExportDefinition>)g.ToArray());
var assemblyNamesForMetadataAttributes = ImmutableHashSet.CreateBuilder <AssemblyName>(ByValueEquality.AssemblyName);
foreach (var export in exportsByMember)
{
GetAssemblyNamesFromMetadataAttributes <MetadataAttributeAttribute>(export.Key, assemblyNamesForMetadataAttributes);
}
return(new ComposablePartDefinition(
TypeRef.Get(partType, this.Resolver),
partMetadata.ToImmutable(),
exportsOnType,
exportsOnMembers,
imports.ToImmutable(),
partCreationPolicy != CreationPolicy.NonShared ? string.Empty : null,
MethodRef.Get(onImportsSatisfied, this.Resolver),
MethodRef.Get(importingCtor, this.Resolver),
importingCtor != null ? importingConstructorParameters.ToImmutable() : null, // some MEF parts are only for metadata
partCreationPolicy,
assemblyNamesForMetadataAttributes,
partCreationPolicy != CreationPolicy.NonShared));
}
private ValueForImportSite GetValueForImportSite(RuntimePartLifecycleTracker importingPartTracker, RuntimeComposition.RuntimeImport import)
{
Requires.NotNull(import, nameof(import));
Func <Func <object>, object, object> lazyFactory = import.LazyFactory;
var exports = import.SatisfyingExports;
if (import.Cardinality == ImportCardinality.ZeroOrMore)
{
if (import.ImportingSiteType.IsArray || (import.ImportingSiteType.GetTypeInfo().IsGenericType&& import.ImportingSiteType.GetGenericTypeDefinition().IsEquivalentTo(typeof(IEnumerable <>))))
{
Array array = Array.CreateInstance(import.ImportingSiteTypeWithoutCollection, exports.Count);
using (var intArray = ArrayRental <int> .Get(1))
{
int i = 0;
foreach (var export in exports)
{
intArray.Value[0] = i++;
var exportedValue = this.GetValueForImportElement(importingPartTracker, import, export, lazyFactory);
this.ThrowIfExportedValueIsNotAssignableToImport(import, export, exportedValue);
array.SetValue(exportedValue, intArray.Value);
}
}
return(new ValueForImportSite(array));
}
else
{
object collectionObject = null;
MemberInfo importingMember = import.ImportingMember;
if (importingMember != null)
{
collectionObject = GetImportingMember(importingPartTracker.Value, importingMember);
}
bool preexistingInstance = collectionObject != null;
if (!preexistingInstance)
{
if (PartDiscovery.IsImportManyCollectionTypeCreateable(import.ImportingSiteType, import.ImportingSiteTypeWithoutCollection))
{
using (var typeArgs = ArrayRental <Type> .Get(1))
{
typeArgs.Value[0] = import.ImportingSiteTypeWithoutCollection;
Type listType = typeof(List <>).MakeGenericType(typeArgs.Value);
if (import.ImportingSiteType.GetTypeInfo().IsAssignableFrom(listType.GetTypeInfo()))
{
collectionObject = Activator.CreateInstance(listType);
}
else
{
collectionObject = Activator.CreateInstance(import.ImportingSiteType);
}
}
SetImportingMember(importingPartTracker.Value, importingMember, collectionObject);
}
else
{
throw new CompositionFailedException(
string.Format(
CultureInfo.CurrentCulture,
Strings.UnableToInstantiateCustomImportCollectionType,
import.ImportingSiteType.FullName,
$"{import.DeclaringTypeRef.FullName}.{import.ImportingMemberRef?.Name}"));
}
}
var collectionAccessor = CollectionServices.GetCollectionWrapper(import.ImportingSiteTypeWithoutCollection, collectionObject);
if (preexistingInstance)
{
collectionAccessor.Clear();
}
foreach (var export in exports)
{
var exportedValue = this.GetValueForImportElement(importingPartTracker, import, export, lazyFactory);
this.ThrowIfExportedValueIsNotAssignableToImport(import, export, exportedValue);
collectionAccessor.Add(exportedValue);
}
return(default(ValueForImportSite)); // signal caller should not set value again.
}
}
else
{
var export = exports.FirstOrDefault();
if (export == null)
{
return(new ValueForImportSite(null));
}
var exportedValue = this.GetValueForImportElement(importingPartTracker, import, export, lazyFactory);
this.ThrowIfExportedValueIsNotAssignableToImport(import, export, exportedValue);
return(new ValueForImportSite(exportedValue));
}
}
protected override ComposablePartDefinition CreatePart(Type partType, bool typeExplicitlyRequested)
{
Requires.NotNull(partType, nameof(partType));
var partTypeInfo = partType.GetTypeInfo();
if (!typeExplicitlyRequested)
{
bool isPublic = partType.IsNested ? partTypeInfo.IsNestedPublic : partTypeInfo.IsPublic;
if (!this.IsNonPublicSupported && !isPublic)
{
// Skip non-public types.
return(null);
}
}
var declaredProperties = partTypeInfo.GetProperties(BindingFlags.Instance | this.PublicVsNonPublicFlags);
var exportingProperties = from member in declaredProperties
from export in member.GetAttributes <ExportAttribute>()
select new KeyValuePair <MemberInfo, ExportAttribute>(member, export);
var exportedTypes = from export in partTypeInfo.GetAttributes <ExportAttribute>()
select new KeyValuePair <MemberInfo, ExportAttribute>(partTypeInfo, export);
var exportsByMember = (from export in exportingProperties.Concat(exportedTypes)
group export.Value by export.Key into exportsByType
select exportsByType).Select(g => new KeyValuePair <MemberInfo, ExportAttribute[]>(g.Key, g.ToArray())).ToArray();
if (exportsByMember.Length == 0)
{
return(null);
}
// Check for PartNotDiscoverable only after we've established it's an interesting part.
// This optimizes for the fact that most types have no exports, in which case it's not a discoverable
// part anyway. Checking for the PartNotDiscoverableAttribute first, which is rarely defined,
// doesn't usually pay for itself in terms of short-circuiting. But it does add an extra
// attribute to look for that we don't need to find for all the types that have no export attributes either.
if (!typeExplicitlyRequested && partTypeInfo.IsAttributeDefined <PartNotDiscoverableAttribute>())
{
return(null);
}
TypeRef partTypeRef = TypeRef.Get(partType, this.Resolver);
Type partTypeAsGenericTypeDefinition = partTypeInfo.IsGenericType ? partType.GetGenericTypeDefinition() : null;
string sharingBoundary = null;
var sharedAttribute = partTypeInfo.GetFirstAttribute <SharedAttribute>();
if (sharedAttribute != null)
{
sharingBoundary = sharedAttribute.SharingBoundary ?? string.Empty;
}
CreationPolicy partCreationPolicy = sharingBoundary != null ? CreationPolicy.Shared : CreationPolicy.NonShared;
var allExportsMetadata = ImmutableDictionary.CreateRange(PartCreationPolicyConstraint.GetExportMetadata(partCreationPolicy));
var exportsOnType = ImmutableList.CreateBuilder <ExportDefinition>();
var exportsOnMembers = ImmutableDictionary.CreateBuilder <MemberRef, IReadOnlyCollection <ExportDefinition> >();
var imports = ImmutableList.CreateBuilder <ImportDefinitionBinding>();
foreach (var export in exportsByMember)
{
var member = export.Key;
var memberExportMetadata = allExportsMetadata.AddRange(this.GetExportMetadata(member));
if (member is TypeInfo)
{
foreach (var exportAttribute in export.Value)
{
Type exportedType = exportAttribute.ContractType ?? partTypeAsGenericTypeDefinition ?? partType;
ExportDefinition exportDefinition = CreateExportDefinition(memberExportMetadata, exportAttribute, exportedType);
exportsOnType.Add(exportDefinition);
}
}
else // property
{
var property = (PropertyInfo)member;
Verify.Operation(!partTypeInfo.IsGenericTypeDefinition, Strings.ExportsOnMembersNotAllowedWhenDeclaringTypeGeneric);
var exportDefinitions = ImmutableList.CreateBuilder <ExportDefinition>();
foreach (var exportAttribute in export.Value)
{
Type exportedType = exportAttribute.ContractType ?? property.PropertyType;
ExportDefinition exportDefinition = CreateExportDefinition(memberExportMetadata, exportAttribute, exportedType);
exportDefinitions.Add(exportDefinition);
}
exportsOnMembers.Add(MemberRef.Get(member, this.Resolver), exportDefinitions.ToImmutable());
}
}
foreach (var member in declaredProperties)
{
var importAttribute = member.GetFirstAttribute <ImportAttribute>();
var importManyAttribute = member.GetFirstAttribute <ImportManyAttribute>();
Requires.Argument(!(importAttribute != null && importManyAttribute != null), "partType", Strings.MemberContainsBothImportAndImportMany, member.Name);
var importConstraints = GetImportConstraints(member);
ImportDefinition importDefinition;
if (this.TryCreateImportDefinition(ReflectionHelpers.GetMemberType(member), member, importConstraints, out importDefinition))
{
var importDefinitionBinding = new ImportDefinitionBinding(
importDefinition,
TypeRef.Get(partType, this.Resolver),
MemberRef.Get(member, this.Resolver),
TypeRef.Get(member.PropertyType, this.Resolver),
TypeRef.Get(GetImportingSiteTypeWithoutCollection(importDefinition, member.PropertyType), this.Resolver));
imports.Add(importDefinitionBinding);
}
}
MethodInfo onImportsSatisfied = null;
foreach (var method in partTypeInfo.GetMethods(this.PublicVsNonPublicFlags | BindingFlags.Instance))
{
if (method.IsAttributeDefined <OnImportsSatisfiedAttribute>())
{
Verify.Operation(method.GetParameters().Length == 0, Strings.OnImportsSatisfiedTakeNoParameters);
Verify.Operation(onImportsSatisfied == null, Strings.OnlyOneOnImportsSatisfiedMethodIsSupported);
onImportsSatisfied = method;
}
}
var importingConstructorParameters = ImmutableList.CreateBuilder <ImportDefinitionBinding>();
var importingCtor = GetImportingConstructor <ImportingConstructorAttribute>(partType, publicOnly: !this.IsNonPublicSupported);
Verify.Operation(importingCtor != null, Strings.NoImportingConstructorFound);
foreach (var parameter in importingCtor.GetParameters())
{
var import = this.CreateImport(parameter, GetImportConstraints(parameter));
if (import.ImportDefinition.Cardinality == ImportCardinality.ZeroOrMore)
{
Verify.Operation(PartDiscovery.IsImportManyCollectionTypeCreateable(import), Strings.CollectionMustBePublicAndPublicCtorWhenUsingImportingCtor);
}
importingConstructorParameters.Add(import);
}
var partMetadata = ImmutableDictionary.CreateBuilder <string, object>();
foreach (var partMetadataAttribute in partTypeInfo.GetAttributes <PartMetadataAttribute>())
{
partMetadata[partMetadataAttribute.Name] = partMetadataAttribute.Value;
}
var assemblyNamesForMetadataAttributes = ImmutableHashSet.CreateBuilder <AssemblyName>(ByValueEquality.AssemblyName);
foreach (var export in exportsByMember)
{
GetAssemblyNamesFromMetadataAttributes <MetadataAttributeAttribute>(export.Key, assemblyNamesForMetadataAttributes);
}
return(new ComposablePartDefinition(
TypeRef.Get(partType, this.Resolver),
partMetadata.ToImmutable(),
exportsOnType.ToImmutable(),
exportsOnMembers.ToImmutable(),
imports.ToImmutable(),
sharingBoundary,
MethodRef.Get(onImportsSatisfied, this.Resolver),
MethodRef.Get(importingCtor, this.Resolver),
importingConstructorParameters.ToImmutable(),
partCreationPolicy,
assemblyNamesForMetadataAttributes));
}