public override bool Equals(IReadOnlyDictionary <string, object> x, IReadOnlyDictionary <string, object> y)
{
if (object.ReferenceEquals(x, y))
{
return(true);
}
// Be sure we're comparing TypeRefs instead of resolved Types to avoid loading assemblies unnecessarily.
return(base.Equals(LazyMetadataWrapper.TryUnwrap(x), LazyMetadataWrapper.TryUnwrap(y)));
}
protected void Write(IReadOnlyDictionary <string, object> metadata)
{
using (this.Trace("Metadata"))
{
this.WriteCompressedUInt((uint)metadata.Count);
// Special case certain values to avoid defeating lazy load later.
// Check out the ReadMetadata below, how it wraps the return value.
var serializedMetadata = new LazyMetadataWrapper(metadata.ToImmutableDictionary(), LazyMetadataWrapper.Direction.ToSubstitutedValue, this.Resolver);
foreach (var entry in serializedMetadata)
{
this.Write(entry.Key);
this.WriteObject(entry.Value);
}
}
}
/// <summary>
/// Gets the constructed type (non generic type definition) for a part.
/// </summary>
private static Reflection.TypeRef GetPartConstructedTypeRef(RuntimeComposition.RuntimePart part, IReadOnlyDictionary <string, object?> importMetadata)
{
Requires.NotNull(part, nameof(part));
Requires.NotNull(importMetadata, nameof(importMetadata));
if (part.TypeRef.IsGenericTypeDefinition)
{
var bareMetadata = LazyMetadataWrapper.TryUnwrap(importMetadata);
object?typeArgsObject;
if (bareMetadata.TryGetValue(CompositionConstants.GenericParametersMetadataName, out typeArgsObject) && typeArgsObject is object)
{
IEnumerable <TypeRef> typeArgs = typeArgsObject is LazyMetadataWrapper.TypeArraySubstitution
? ((LazyMetadataWrapper.TypeArraySubstitution)typeArgsObject).TypeRefArray
: ReflectionHelpers.TypesToTypeRefs((Type[])typeArgsObject, part.TypeRef.Resolver);
return(part.TypeRef.MakeGenericTypeRef(typeArgs.ToImmutableArray()));
}
}
return(part.TypeRef);
}
protected void Write(IReadOnlyDictionary <string, object?> metadata)
{
using (this.Trace("Metadata"))
{
this.WriteCompressedUInt((uint)metadata.Count);
// Special case certain values to avoid defeating lazy load later.
// Check out the ReadMetadata below, how it wraps the return value.
IReadOnlyDictionary <string, object?> serializedMetadata;
// Unwrap the metadata if its an instance of LazyMetaDataWrapper, the wrapper may end up
// implicitly resolving TypeRefs to Types which is undesirable.
metadata = LazyMetadataWrapper.TryUnwrap(metadata);
serializedMetadata = new LazyMetadataWrapper(metadata.ToImmutableDictionary(), LazyMetadataWrapper.Direction.ToSubstitutedValue, this.Resolver);
foreach (var entry in serializedMetadata)
{
this.Write(entry.Key);
this.WriteObject(entry.Value);
}
}
}
internal static void GetInputAssembliesFromMetadata(ISet <AssemblyName> assemblies, IReadOnlyDictionary <string, object> metadata)
{
Requires.NotNull(assemblies, nameof(assemblies));
Requires.NotNull(metadata, nameof(metadata));
// Get the underlying metadata (should not load the assembly)
metadata = LazyMetadataWrapper.TryUnwrap(metadata);
foreach (var value in metadata.Values.Where(v => v != null))
{
var valueAsType = value as Type;
var valueType = value.GetType();
// Check lazy metadata first, then try to get the type data from the value (if not lazy)
if (typeof(LazyMetadataWrapper.Enum32Substitution) == valueType)
{
((LazyMetadataWrapper.Enum32Substitution)value).EnumType.GetInputAssemblies(assemblies);
}
else if (typeof(LazyMetadataWrapper.TypeSubstitution) == valueType)
{
((LazyMetadataWrapper.TypeSubstitution)value).TypeRef.GetInputAssemblies(assemblies);
}
else if (typeof(LazyMetadataWrapper.TypeArraySubstitution) == valueType)
{
foreach (var typeRef in ((LazyMetadataWrapper.TypeArraySubstitution)value).TypeRefArray)
{
typeRef.GetInputAssemblies(assemblies);
}
}
else if (valueAsType != null)
{
GetTypeAndBaseTypeAssemblies(assemblies, valueAsType);
}
else if (value.GetType().IsArray)
{
// If the value is an array, we should determine the assemblies of each item.
var array = value as object[];
if (array != null)
{
foreach (var obj in array.Where(o => o != null))
{
// Check to see if the value is a type. We should get the assembly from
// the value if that's the case.
var objType = obj as Type;
if (objType != null)
{
GetTypeAndBaseTypeAssemblies(assemblies, objType);
}
else
{
GetTypeAndBaseTypeAssemblies(assemblies, obj.GetType());
}
}
}
else
{
// Array is full of primitives. We can just use value's assembly data
GetTypeAndBaseTypeAssemblies(assemblies, value.GetType());
}
}
else
{
GetTypeAndBaseTypeAssemblies(assemblies, value.GetType());
}
}
}
protected virtual LazyMetadataWrapper Clone(LazyMetadataWrapper oldVersion, IReadOnlyDictionary <string, object> newMetadata)
{
return(new LazyMetadataWrapper(newMetadata.ToImmutableDictionary(), oldVersion.direction, this.resolver));
}
public bool IsSatisfiedBy(ExportDefinition exportDefinition)
{
Requires.NotNull(exportDefinition, nameof(exportDefinition));
// Fast path since immutable dictionaries are slow to enumerate.
if (this.Requirements.IsEmpty)
{
return(true);
}
foreach (var entry in this.Requirements)
{
object value;
if (!LazyMetadataWrapper.TryGetLoadSafeValueTypeRef(exportDefinition.Metadata, entry.Key, this.Resolver, out value))
{
if (entry.Value.IsMetadataumValueRequired)
{
return(false);
}
else
{
// It's not required, and it's not present. No more validation necessary.
continue;
}
}
TypeRef metadatumValueTypeRef = entry.Value.MetadatumValueTypeRef;
if (value == null)
{
if (metadatumValueTypeRef.IsValueType)
{
// A null reference for a value type is not a compatible match.
return(false);
}
else
{
// Null is assignable to any reference type.
continue;
}
}
if (value is TypeRef valueTypeRef)
{
if (!metadatumValueTypeRef.ElementTypeRef.IsAssignableFrom(valueTypeRef.ElementTypeRef))
{
return(false);
}
continue;
}
if (value is TypeRef[] valueTypeRefArray && metadatumValueTypeRef.ElementTypeRef != metadatumValueTypeRef)
{
var receivingElementTypeRef = metadatumValueTypeRef.ElementTypeRef;
foreach (var item in valueTypeRefArray)
{
if (item == null)
{
if (receivingElementTypeRef.IsValueType)
{
return(false);
}
else
{
continue;
}
}
if (!receivingElementTypeRef.IsAssignableFrom(item))
{
return(false);
}
}
continue;
}
}
return(true);
}
