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()})'.");
}
}
public TMetadata Lookup <TMetadata>(string name)
where TMetadata : IMetadata
{
MetadataKey key = this.CreateKey <TMetadata>(name);
ReaderWriterLockSlim slim = this.GetLock <TMetadata>();
try
{
slim.EnterReadLock();
if (this.entries.TryGetValue(key, out object value))
{
return((TMetadata)value);
}
}
catch (LockRecursionException ex)
{
throw MetadataBuilderException.NoRecursion <TMetadata>(name, ex);
}
finally
{
if (slim.IsReadLockHeld)
{
slim.ExitReadLock();
}
}
slim.EnterWriteLock();
try
{
MetadataIdentity identity = new MetadataIdentity(this, name);
IRelationMetadata relation = this.GetCachedMetadata <IRelationMetadata>(name) ?? this.Store.RelationBuilder.GetMetadata(this, identity);
if (relation == null)
{
return(default);