//recursive function to find group with specified name in the scope of the root
private IfcGroup GetGroup(string name, IfcGroup root)
{
if (root.Name == name) return root;
else
{
IEnumerable<IfcGroup> children = root.GetGroupedObjects<IfcGroup>();
foreach (IfcGroup group in children)
{
IfcGroup result = GetGroup(name, group);
if (result != null)
return result;
}
return null;
}
}
private void ClearGroups(IfcGroup root)
{
List<IfcElement> elements = root.GetGroupedObjects<IfcElement>().ToList();
int count = elements.Count;
//must use for cycle instead of foreach because enumeration would collapse
for (int i = 0; i < count; i++)
{
root.RemoveObjectFromGroup(elements[i]);
}
//recursive call for children
IEnumerable<IfcGroup> children = root.GetGroupedObjects<IfcGroup>();
foreach (IfcGroup group in children)
{
ClearGroups(group);
}
}
//create group and add it into the group hierarchy (top -> down creation)
private IfcGroup CreateGroup(string groupName, string classification, IfcGroup parentGroup)
{
IfcGroup group = _model.Instances.Where<IfcGroup>(g => g.Name == groupName).FirstOrDefault();
if (group == null) group = _model.Instances.New<IfcGroup>(g => { g.Name = groupName; g.Description = classification; });
if (parentGroup != null)
{
//check if it is not already child group.
IfcGroup child = parentGroup.GetGroupedObjects<IfcGroup>().Where(g => g.Name == groupName).FirstOrDefault();
if (child == null)
//ad if it is not
parentGroup.AddObjectToGroup(group);
}
//add to the root groups if this is root (there is no parent group)
if (parentGroup == null)
RootGroups.Add(group);
_numCreated++;
return group;
}