private static bool HasAutoExpandProperty(this IEdmModel edmModel, IEdmStructuredType structuredType, IEdmProperty pathProperty, ISet <IEdmStructuredType> visited)
{
if (visited.Contains(structuredType))
{
return(false);
}
visited.Add(structuredType);
List <IEdmStructuredType> structuredTypes = new List <IEdmStructuredType>();
structuredTypes.Add(structuredType);
structuredTypes.AddRange(edmModel.FindAllDerivedTypes(structuredType));
foreach (IEdmStructuredType edmStructuredType in structuredTypes)
{
// for top type, let's retrieve its properties and the properties from base type of top type if has.
// for derived type, let's retrieve the declared properties.
IEnumerable <IEdmProperty> properties = edmStructuredType == structuredType
? edmStructuredType.Properties()
: edmStructuredType.DeclaredProperties;
foreach (IEdmProperty property in properties)
{
switch (property.PropertyKind)
{
case EdmPropertyKind.Structural:
IEdmStructuralProperty structuralProperty = (IEdmStructuralProperty)property;
IEdmTypeReference typeRef = property.Type.GetElementTypeOrSelf();
if (typeRef.IsComplex() && edmModel.CanExpand(typeRef.AsComplex().ComplexDefinition(), structuralProperty))
{
IEdmStructuredType subStrucutredType = typeRef.AsStructured().StructuredDefinition();
if (edmModel.HasAutoExpandProperty(subStrucutredType, structuralProperty, visited))
{
return(true);
}
}
break;
case EdmPropertyKind.Navigation:
IEdmNavigationProperty navigationProperty = (IEdmNavigationProperty)property;
if (IsAutoExpand(navigationProperty, pathProperty, edmStructuredType, edmModel))
{
return(true); // find an auto-expand navigation property path
}
break;
}
}
}
return(false);
}
private static void GetAutoExpandPaths(this IEdmModel edmModel, IEdmStructuredType structuredType, IEdmProperty pathProperty,
Stack <IEdmElement> nodes, ISet <IEdmStructuredType> visited, IList <ExpandModelPath> results,
bool isSelectPresent = false, ModelBoundQuerySettings querySettings = null)
{
if (visited.Contains(structuredType))
{
return;
}
visited.Add(structuredType);
List <IEdmStructuredType> structuredTypes = new List <IEdmStructuredType>();
structuredTypes.Add(structuredType);
structuredTypes.AddRange(edmModel.FindAllDerivedTypes(structuredType));
foreach (IEdmStructuredType edmStructuredType in structuredTypes)
{
IEnumerable <IEdmProperty> properties;
if (edmStructuredType == structuredType)
{
// for base type, let's retrieve its properties and the properties from base type of base type if have.
properties = edmStructuredType.Properties();
}
else
{
// for derived type, let's retrieve the declared properties.
properties = edmStructuredType.DeclaredProperties;
nodes.Push(edmStructuredType); // add a type cast for derived type
}
foreach (IEdmProperty property in properties)
{
switch (property.PropertyKind)
{
case EdmPropertyKind.Structural:
IEdmStructuralProperty structuralProperty = (IEdmStructuralProperty)property;
IEdmTypeReference typeRef = property.Type.GetElementTypeOrSelf();
if (typeRef.IsComplex() && edmModel.CanExpand(typeRef.AsComplex().ComplexDefinition(), structuralProperty))
{
IEdmStructuredType subStructuredType = typeRef.AsStructured().StructuredDefinition();
nodes.Push(structuralProperty);
edmModel.GetAutoExpandPaths(subStructuredType, structuralProperty, nodes, visited, results, isSelectPresent, querySettings);
nodes.Pop();
}
break;
case EdmPropertyKind.Navigation:
IEdmNavigationProperty navigationProperty = (IEdmNavigationProperty)property;
if (IsAutoExpand(navigationProperty, pathProperty, edmStructuredType, edmModel, isSelectPresent, querySettings))
{
nodes.Push(navigationProperty);
results.Add(new ExpandModelPath(nodes.Reverse())); // found an auto-expand navigation property path
nodes.Pop();
}
break;
}
}
if (edmStructuredType != structuredType)
{
nodes.Pop(); // pop the type cast for derived type
}
}
}
