private void MapSelectionSubSet(SelectionSubset selSubset, TypeDefBase typeDef)
{
switch (typeDef)
{
case ScalarTypeDef _:
case EnumTypeDef _:
// that should never happen
AddError($"Scalar or Enum may not have a selection subset", selSubset);
break;
case ObjectTypeDef objTypeDef:
MapObjectSelectionSubset(selSubset, objTypeDef);
break;
case InterfaceTypeDef intTypeDef:
foreach (var objType in intTypeDef.PossibleTypes)
{
MapObjectSelectionSubset(selSubset, objType);
}
break;
case UnionTypeDef unionTypeDef:
foreach (var objType in unionTypeDef.PossibleTypes)
{
MapObjectSelectionSubset(selSubset, objType, isForUnion: true);
}
break;
}
}
// Might be called for ObjectType or Interface (for intf - just to check fields exist)
private void MapObjectSelectionSubset(SelectionSubset selSubset, ObjectTypeDef objectTypeDef, IList <RequestDirective> directives, bool isForUnion = false)
{
var mappedFields = MapSelectionItems(selSubset.Items, objectTypeDef, directives, isForUnion);
selSubset.MappedItemSets.Add(new MappedObjectItemSet()
{
ObjectTypeDef = objectTypeDef, Items = mappedFields
});
}
} //method
private MappedSelectionSubSet GetMappedSubset(SelectionSubset subSet, IList <ObjectTypeDef> objectTypeDefs, Type entityType,
NamedRequestObject requestObj)
{
var mappedSubset = subSet.MappedSubSets.FirstOrDefault(
ms => (ms.Mapping.EntityType == entityType || ms.Mapping.EntityType.IsAssignableFrom(entityType)) &&
objectTypeDefs.Contains(ms.Mapping.TypeDef));
if (mappedSubset == null)
{
var types = string.Join(",", objectTypeDefs);
this._requestContext.AddError($"Failed to find mapping from entity type {entityType} to GraphQLType(s) [{types}].",
requestObj);
AbortRequest();
}
return(mappedSubset);
}
// Might be called for ObjectType or Interface (for intf - just to check fields exist)
private void MapObjectSelectionSubset(SelectionSubset selSubset, ObjectTypeDef objectTypeDef, bool isForUnion = false)
{
// Map arguments on fields, add directives, map fragments
foreach (var item in selSubset.Items)
{
AddRuntimeRequestDirectives(item);
switch (item)
{
case SelectionField selFld:
var fldDef = objectTypeDef.Fields[selFld.Name];
if (fldDef == null)
{
// if field not found, the behavior depends if it is a union; it is error for a union
if (!isForUnion)
{
AddError($"Field '{selFld.Name}' not found on type '{objectTypeDef.Name}'.", selFld);
}
continue;
}
selFld.MappedArgs = MapArguments(selFld.Args, fldDef.Args, selFld);
AddRuntimeModelDirectives(fldDef);
MapSelectionFieldSubsetIfPresent(selFld, fldDef.TypeRef.TypeDef);
break;
case FragmentSpread fspread:
// Named fragment refs are NOT set by parser; parser sets only Inline fragmDefs; we need to match named fragms here
if (!fspread.IsInline && fspread.Fragment == null)
{
fspread.Fragment = GetFragmentDef(fspread.Name);
if (fspread.Fragment == null)
{
AddError($"Fragment {fspread.Name} not defined.", fspread);
}
}
break;
} //switch
} //foreach item
if (_requestContext.Failed)
{
return;
}
// Now create mappings for all possible entity types
foreach (var typeMapping in objectTypeDef.Mappings)
{
// It is possible mapped set already exists (with unions and especially fragments)
var existing = selSubset.MappedSubSets.FirstOrDefault(ms => ms.Mapping == typeMapping);
if (existing != null)
{
continue;
}
var mappedItems = new List <MappedSelectionItem>();
foreach (var item in selSubset.Items)
{
switch (item)
{
case SelectionField selFld:
var fldDef = typeMapping.TypeDef.Fields[selFld.Name];
if (fldDef == null)
{
// it is not error, it should have been caught earlier; it is unmatch for union
continue;
}
var fldResolver = typeMapping.GetResolver(fldDef);
//.FirstOrDefault(fr => fr.Field.Name == selFld.Name);
var mappedFld = new MappedSelectionField(selFld, fldResolver);
mappedItems.Add(mappedFld);
break;
case FragmentSpread fs:
var onType = fs.Fragment.OnTypeRef?.TypeDef;
var skip = onType != null && onType.Kind == TypeKind.Object && onType != objectTypeDef;
if (skip)
{
continue;
}
if (fs.IsInline) // only inline fragments should be mapped from here; named fragments are mapped separately, upfront
{
MapObjectSelectionSubset(fs.Fragment.SelectionSubset, objectTypeDef, isForUnion);
}
var mappedSpread = new MappedFragmentSpread(fs);
mappedItems.Add(mappedSpread);
break;
} //switch
} //foreach item
selSubset.MappedSubSets.Add(new MappedSelectionSubSet()
{
Mapping = typeMapping, MappedItems = mappedItems
});
} //foreach typeMapping
}
private async Task ExecuteObjectsSelectionSubsetAsync(IList <OutputObjectScope> parentScopes,
ObjectTypeDef objTypeDef, SelectionSubset subSet)
{
var outItemSet = subSet.MappedItemSets.FirstOrDefault(fi => fi.ObjectTypeDef == objTypeDef);
var mappedFields = _requestContext.GetIncludedMappedFields(outItemSet);
// init scopes
foreach (var scope in parentScopes)
{
scope.Init(objTypeDef, mappedFields);
}
for (int fldIndex = 0; fldIndex < mappedFields.Count; fldIndex++)
{
var mappedField = mappedFields[fldIndex];
var returnsComplexType = mappedField.FieldDef.Flags.IsSet(FieldFlags.ReturnsComplexType);
var fieldContext = new FieldContext(_requestContext, this, mappedField, fldIndex, parentScopes);
foreach (var scope in fieldContext.AllParentScopes)
{
if (fieldContext.BatchResultWasSet && scope.HasValue(fldIndex))
{
continue;
}
fieldContext.CurrentScope = scope;
object result = null;
switch (mappedField.FieldDef.ExecutionType)
{
case FieldExecutionType.Reader:
result = InvokeFieldReader(fieldContext, fieldContext.CurrentScope.Entity);
break;
case FieldExecutionType.Resolver:
result = await InvokeResolverAsync(fieldContext);
break;
}
var outValue = fieldContext.ConvertToOuputValue(result);
if (!fieldContext.BatchResultWasSet)
{
scope.SetValue(fldIndex, outValue);
}
} //foreach scope
// if there are any non-null object-type results, add this field context to this special list
// to execute selection subsets in the next round.
if (returnsComplexType && fieldContext.AllResultScopes.Count > 0)
{
_executedObjectFieldContexts.Add(fieldContext);
}
} //foreach fldIndex
} //method
