private void ValidateContract(RelationMetadata metadata, IRelationContract contract)
{
if (contract.ItemType == null)
{
throw MetadataBuilderException.InvalidContract(metadata, "Item type cannot be null.");
}
else if (string.IsNullOrWhiteSpace(contract.ItemName))
{
throw MetadataBuilderException.InvalidContract(metadata, "Item name cannot be empty.");
}
else
{
Type enumerableType = typeof(IEnumerable <>).MakeGenericType(contract.ItemType);
if (!enumerableType.IsAssignableFrom(metadata.Type))
{
throw MetadataBuilderException.InvalidContract(metadata, $"List of type '{metadata.Type.GetSanitizedName()}' cannot be converted to '{enumerableType.GetSanitizedName()}'.");
}
}
if (contract.ReadIndex != null && !contract.ReadIndex.HasSignature(contract.ItemType, typeof(int)))
{
throw MetadataBuilderException.InvalidContract(metadata, $"ReadIndex method must have signature '{contract.ItemType.GetSanitizedName()} (int)'.");
}
if (contract.WriteIndex != null && !contract.WriteIndex.HasSignature(typeof(void), typeof(int), contract.ItemType))
{
throw MetadataBuilderException.InvalidContract(metadata, $"WriteIndex method must have signature 'void (int, {contract.ItemType.GetSanitizedName()})'.");
}
}
private Lazy <IRelationMetadata> CreateRecursor(RelationMetadata metadata)
{
if (metadata.HasFlag(RelationMetadataFlags.Item))
{
IRelationMetadata recursiveParent = this.GetRecursiveParent(metadata);
if (recursiveParent != null)
{
string recursivePath = metadata.Notation.Path(recursiveParent.Identity.Name, metadata.Parent.Identity.Name);
string otherPath = metadata.Notation.Combine(metadata.Identity.Name, recursivePath);
MetadataIdentity otherId = metadata.Identity.Push(recursivePath);
return(new Lazy <IRelationMetadata>(() => this.GetMetadata(metadata.Schema, otherId)));
}
}
else if (metadata.Owner.Recursor != null)
{
IRelationContract contract = this.GetContract(metadata);
if (contract != null && metadata.Owner.Type.Equals(contract.ItemType))
{
return(new Lazy <IRelationMetadata>(() => metadata.Owner));
}
}
return(null);
}
private RelationMetadata CreateItem(RelationMetadata parent)
{
if (parent.Owner.HasFlag(RelationMetadataFlags.Recursive))
{
MemberInfo parentMember = parent.Owner.Parent?.Member;
MemberInfo thisMember = parent.Member;
if (parentMember != null && parentMember.Equals(thisMember))
{
return(null);
}
}
IRelationContract contract = this.GetContract(parent);
if (contract == null)
{
return(null);
}
MetadataIdentity itemId = parent.Identity.Push(contract.ItemName ?? "Item");
RelationMetadata metadata = new RelationMetadata(parent.Schema, itemId)
{
Parent = parent,
Type = contract.ItemType,
Flags = RelationMetadataFlags.Item,
ReadIndex = contract.ReadIndex,
WriteIndex = contract.WriteIndex,
Depth = parent.Depth + 1,
};
metadata.Owner = metadata;
metadata.Item = this.CreateItem(metadata);
metadata.Properties = this.CreateLazy(() => this.CreateProperties(metadata));
metadata.Annotations = this.CreateAnnotations(metadata).ToList();
if (contract.ReadIndex != null)
{
metadata.Flags |= RelationMetadataFlags.Readable;
}
if (contract.WriteIndex != null)
{
metadata.Flags |= RelationMetadataFlags.Writable;
}
if (metadata.Item != null)
{
metadata.Flags |= RelationMetadataFlags.List;
}
return(metadata);
}
private IRelationContract GetContract(RelationMetadata metadata)
{
IEnumerable <IRelationContractResolver> allResolvers = new[] { this.DefaultResolver }.Concat(this);
IRelationContract contract = allResolvers.Reverse().NotNull(cr => cr.GetContract(metadata)).FirstOrDefault();
if (contract != null)
{
this.ValidateContract(metadata, contract);
}
return(contract);
}
