/// <summary>
/// Deal with missing "LayerAssignments" in IFC2x3 EXP file.
/// </summary>
/// <param name="layerAssignment">The layer assignment to add to this representation.</param>
public void PostProcessLayerAssignment(IFCPresentationLayerAssignment layerAssignment)
{
if (LayerAssignment == null)
{
LayerAssignment = layerAssignment;
}
else
{
IFCImportDataUtil.CheckLayerAssignmentConsistency(LayerAssignment, layerAssignment, Id);
}
}
/// <summary>
/// Get the one layer assignment associated to this handle, if it is defined.
/// </summary>
/// <param name="ifcLayeredItem">The handle assumed to be an IfcRepresentation or IfcRepresentationItem.</param>
/// <param name="isIFCRepresentation">True if the handle is an IfcRepresentation. This determines the name of the inverse attribute.</param>
/// <returns>The associated IfcLayerAssignment.</returns>
/// <remarks>This deals with the issues that:
/// 1. the default IFC2x3 EXP file doesn't have this inverse attribute set.
/// 2. The name changed in IFC4.
/// 3. The attribute didn't exist before IFC2x3.</remarks>
static public IFCPresentationLayerAssignment GetTheLayerAssignment(IFCAnyHandle ifcLayeredItem, bool isIFCRepresentation)
{
IFCPresentationLayerAssignment theLayerAssignment = null;
IList <IFCAnyHandle> layerAssignments = null;
if (IFCImportFile.TheFile.Options.AllowUseLayerAssignments)
{
// Inverse attribute changed names in IFC4 for IfcRepresentationItem only.
string layerAssignmentsAttributeName = (isIFCRepresentation || IFCImportFile.TheFile.SchemaVersion < IFCSchemaVersion.IFC4) ? "LayerAssignments" : "LayerAssignment";
try
{
layerAssignments = IFCAnyHandleUtil.GetAggregateInstanceAttribute
<List <IFCAnyHandle> >(ifcLayeredItem, layerAssignmentsAttributeName);
}
catch
{
IFCImportFile.TheFile.Options.AllowUseLayerAssignments = false;
layerAssignments = null;
}
}
if (layerAssignments != null && layerAssignments.Count > 0)
{
// We can only handle one layer assignment, but we allow the possiblity that there are duplicates. Do a top-level check.
foreach (IFCAnyHandle layerAssignment in layerAssignments)
{
if (!IFCAnyHandleUtil.IsSubTypeOf(layerAssignment, IFCEntityType.IfcPresentationLayerAssignment))
{
Importer.TheLog.LogUnexpectedTypeError(layerAssignment, IFCEntityType.IfcStyledItem, false);
theLayerAssignment = null;
break;
}
else
{
IFCPresentationLayerAssignment compLayerAssignment = IFCPresentationLayerAssignment.ProcessIFCPresentationLayerAssignment(layerAssignment);
if (theLayerAssignment == null)
{
theLayerAssignment = compLayerAssignment;
continue;
}
if (!IFCImportDataUtil.CheckLayerAssignmentConsistency(theLayerAssignment, compLayerAssignment, ifcLayeredItem.StepId))
{
break;
}
}
}
}
return(theLayerAssignment);
}
