protected override void SetOperations()

in src/Microsoft.OpenApi.OData.Reader/PathItem/NavigationPropertyPathItemHandler.cs [49:118]
56 lines of code
20 McCabe index (conditional complexity)

		protected override void SetOperations(OpenApiPathItem item)
        {
            IEdmEntitySet entitySet = NavigationSource as IEdmEntitySet;
            IEdmVocabularyAnnotatable target = entitySet;
            if (target == null)
            {
                target = NavigationSource as IEdmSingleton;
            }

            string navigationPropertyPath = String.Join("/",
                Path.Segments.Where(s => !(s is ODataKeySegment || s is ODataNavigationSourceSegment)).Select(e => e.Identifier));

            NavigationRestrictionsType navigation = Context.Model.GetRecord<NavigationRestrictionsType>(target, CapabilitiesConstants.NavigationRestrictions);
            NavigationPropertyRestriction restriction = navigation?.RestrictedProperties?.FirstOrDefault(r => r.NavigationProperty == navigationPropertyPath);

            // verify using individual first
            if (restriction != null && restriction.Navigability != null && restriction.Navigability.Value == NavigationType.None)
            {
                return;
            }

            if (restriction == null || restriction.Navigability == null)
            {
                // if the individual has not navigability setting, use the global navigability setting
                if (navigation != null && navigation.Navigability != null && navigation.Navigability.Value == NavigationType.None)
                {
                    // Default navigability for all navigation properties of the annotation target.
                    // Individual navigation properties can override this value via `RestrictedProperties/Navigability`.
                    return;
                }
            }

            // containment: Get / (Post - Collection | Patch - Single)
            // non-containment: Get
            AddGetOperation(item, restriction);

            if (NavigationProperty.ContainsTarget)
            {
                if (NavigationProperty.TargetMultiplicity() == EdmMultiplicity.Many)
                {
                    if (LastSegmentIsKeySegment)
                    {
                        // Need to check this scenario is valid or not?
                        UpdateRestrictionsType update = restriction?.UpdateRestrictions;
                        if (update == null || update.IsUpdatable)
                        {
                            AddOperation(item, OperationType.Patch);
                        }
                    }
                    else
                    {
                        InsertRestrictionsType insert = restriction?.InsertRestrictions;
                        if (insert == null || insert.IsInsertable)
                        {
                            AddOperation(item, OperationType.Post);
                        }
                    }
                }
                else
                {
                    UpdateRestrictionsType update = restriction?.UpdateRestrictions;
                    if (update == null || update.IsUpdatable)
                    {
                        AddOperation(item, OperationType.Patch);
                    }
                }
            }

            AddDeleteOperation(item, restriction);
        }