/// <summary>
/// Initializes a new instance for the specified graph types and directives, and with the specified type resolver and name converter.
/// </summary>
/// <param name="types">A list of graph type instances to register in the lookup table.</param>
/// <param name="directives">A list of directives to register.</param>
/// <param name="resolveType">A delegate which returns an instance of a graph type from its .NET type.</param>
/// <param name="schema">A schema for which this instance is created.</param>
public static SchemaTypes Create(
IEnumerable <IGraphType> types,
IEnumerable <DirectiveGraphType> directives,
Func <Type, IGraphType> resolveType,
ISchema schema)
{
var lookup = new SchemaTypes(schema);
var ctx = new TypeCollectionContext(t => lookup._builtInScalars.TryGetValue(t, out var graphType) ? graphType : resolveType(t), (name, graphType, context) =>
{
if (lookup[name] == null)
{
lookup.AddType(graphType, context);
}
});
foreach (var type in types)
{
lookup.AddType(type, ctx);
}
// these fields must not have their field names translated by INameConverter; see HandleField
lookup.HandleField(null, lookup.SchemaMetaFieldType, ctx, false);
lookup.HandleField(null, lookup.TypeMetaFieldType, ctx, false);
lookup.HandleField(null, lookup.TypeNameMetaFieldType, ctx, false);
foreach (var directive in directives)
{
if (directive.Arguments?.Count > 0)
{
foreach (var arg in directive.Arguments.List)
{
if (arg.ResolvedType != null)
{
lookup.AddTypeIfNotRegistered(arg.ResolvedType, ctx);
arg.ResolvedType = lookup.ConvertTypeReference(directive, arg.ResolvedType);
}
else
{
lookup.AddTypeIfNotRegistered(arg.Type, ctx);
arg.ResolvedType = lookup.BuildNamedType(arg.Type, ctx.ResolveType);
}
}
}
}
lookup.ApplyTypeReferences();
Debug.Assert(ctx.InFlightRegisteredTypes.Count == 0);
lookup._sealed = true;
return(lookup);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
if (!_disposed)
{
_services = null;
Query = null;
Mutation = null;
Subscription = null;
Filter = null;
_additionalInstances?.Clear();
_additionalTypes?.Clear();
Directives.List.Clear();
_converters.Clear();
_allTypes?.Dictionary.Clear();
_allTypes = null;
_disposed = true;
}
}
}
private void CreateSchemaTypes()
{
IEnumerable <IGraphType> GetTypes()
{
if (_additionalInstances != null)
{
foreach (var instance in _additionalInstances)
{
yield return(instance);
}
}
//TODO: According to the specification, Query is a required type. But if you uncomment these lines, then the mass of tests begin to fail, because they do not set Query.
// if (Query == null)
// throw new InvalidOperationException("Query root type must be provided. See https://graphql.github.io/graphql-spec/June2018/#sec-Schema-Introspection");
if (Query != null)
{
yield return(Query);
}
if (Mutation != null)
{
yield return(Mutation);
}
if (Subscription != null)
{
yield return(Subscription);
}
if (_additionalTypes != null)
{
foreach (var type in _additionalTypes)
{
yield return((IGraphType)_services.GetRequiredService(type.GetNamedType()));
}
}
}
IEnumerable <ISchemaNodeVisitor> GetVisitors()
{
if (_visitors != null)
{
foreach (var visitor in _visitors)
{
yield return(visitor);
}
}
if (_visitorTypes != null)
{
foreach (var type in _visitorTypes)
{
yield return((ISchemaNodeVisitor)_services.GetRequiredService(type));
}
}
}
_allTypes = SchemaTypes.Create(
GetTypes(),
Directives,
type => (IGraphType)_services.GetRequiredService(type),
this);
// At this point, Initialized will return false, and Initialize will still lock while waiting for initialization to complete.
// However, AllTypes and similar properties will return a reference to SchemaTypes without waiting for a lock.
_allTypes.ApplyMiddleware(FieldMiddleware);
foreach (var visitor in GetVisitors())
{
visitor.Run(this);
}
Validate();
}