/// <summary>
/// Visits a collection item.
/// </summary>
/// <param name="collectionValue">The collection to visit.</param>
protected override ODataPayloadElement VisitCollectionValue(ODataCollectionValue collectionValue)
{
if (collectionValue == null)
{
return(new PrimitiveMultiValue(null, true));
}
bool?isPrimitiveCollection = null;
// Try to parse the type name and if the item type name is a primitive EDM type, then this is a primitive collection.
string typeName = collectionValue.TypeName;
if (typeName != null)
{
string itemTypeName = EntityModelUtils.GetCollectionItemTypeName(typeName);
isPrimitiveCollection = itemTypeName != null && EntityModelUtils.GetPrimitiveEdmType(itemTypeName) != null;
}
List <object> items = new List <object>();
foreach (object item in collectionValue.Items)
{
if (!isPrimitiveCollection.HasValue)
{
ODataComplexValue complexItemValue = item as ODataComplexValue;
// If the first item is a complex value, then the collection is of complex kind.
// Note that if the first item is null, we assume primitive collection, since we can't really decide (and it's an invalid thing anyway)
isPrimitiveCollection = complexItemValue == null;
}
if (isPrimitiveCollection.Value)
{
items.Add((PrimitiveValue)this.Visit(item));
}
else
{
ODataComplexValue complexItemValue = item as ODataComplexValue;
ExceptionUtilities.Assert(
item == null || complexItemValue != null,
"The collection was determined to be of complex values but one of its items is not an ODataComplexValue.");
items.Add((ComplexInstance)this.Visit(complexItemValue));
}
}
if (!isPrimitiveCollection.HasValue)
{
// If we could not tell until now (possible only if there was no type name and no items)
// assume primitive collection.
isPrimitiveCollection = true;
}
if (isPrimitiveCollection == true)
{
PrimitiveMultiValue primitiveCollection = new PrimitiveMultiValue(typeName, false);
foreach (object item in items)
{
primitiveCollection.Add((PrimitiveValue)item);
}
this.ConvertSerializationTypeNameAnnotation(collectionValue, primitiveCollection);
return(primitiveCollection);
}
else
{
ComplexMultiValue complexCollection = new ComplexMultiValue(typeName, false);
foreach (object item in items)
{
complexCollection.Add((ComplexInstance)item);
}
this.ConvertSerializationTypeNameAnnotation(collectionValue, complexCollection);
return(complexCollection);
}
}