#1539 Option to specify id/instance_name in file::add()

src/ifcopenshell-python/ifcopenshell/file.py

@@ -80,8 +80,12 @@ class file(object):
             f.create_entity('IfcPerson', Identification='Foobar')
             >>> #3=IfcPerson('Foobar',$,$,$,$,$,$,$)
         """
+        eid = -1
+        try:
+            eid = kwargs.pop("_id", -1)
+        except: pass
         e = entity_instance((self.schema, type))
-        self.wrapped_data.add(e.wrapped_data)
+        self.wrapped_data.add(e.wrapped_data, eid)
         e.wrapped_data.this.disown()
         attrs = list(enumerate(args)) + [(e.wrapped_data.get_argument_index(name), arg) for name, arg in kwargs.items()]
         for idx, arg in attrs:
@@ -120,12 +124,12 @@ class file(object):
         """
         return self[guid]
 
-    def add(self, inst):
+    def add(self, inst, _id=None):
         """Adds an entity including any dependent entities to an IFC file.
 
         If the entity already exists, it is not re-added."""
         inst.wrapped_data.this.disown()
-        return entity_instance(self.wrapped_data.add(inst.wrapped_data))
+        return entity_instance(self.wrapped_data.add(inst.wrapped_data, -1 if _id is None else _id))
 
     def by_type(self, type, include_subtypes=True):
         """Return IFC objects filtered by IFC Type and wrapped with the entity_instance class.

src/ifcparse/IfcFile.h

@@ -230,7 +230,7 @@ public:
 
 	void recalculate_id_counter();
 
-	IfcUtil::IfcBaseClass* addEntity(IfcUtil::IfcBaseClass* entity);
+	IfcUtil::IfcBaseClass* addEntity(IfcUtil::IfcBaseClass* entity, int id=-1);
 	void addEntities(IfcEntityList::ptr es);
 
 	void batch() { batch_mode_ = true; }

src/ifcparse/IfcParse.cpp

@@ -1562,7 +1562,11 @@ void IfcFile::addEntities(IfcEntityList::ptr es) {
 	}
 }
 
-IfcUtil::IfcBaseClass* IfcFile::addEntity(IfcUtil::IfcBaseClass* entity) {
+IfcUtil::IfcBaseClass* IfcFile::addEntity(IfcUtil::IfcBaseClass* entity, int id) {
+	if (id != -1 && byid.find((unsigned)id) != byid.end()) {
+		throw IfcParse::IfcException("An instance with id " + boost::lexical_cast<std::string>(id) + " is already part of this file");
+	}
+
 	if (entity->declaration().schema() != schema()) {
 		throw IfcParse::IfcException("Unabled to add instance from " + entity->declaration().schema()->name() + " schema to file with " + schema()->name() + " schema");
 	}
@@ -1698,7 +1702,14 @@ IfcUtil::IfcBaseClass* IfcFile::addEntity(IfcUtil::IfcBaseClass* entity) {
 		// the instance is pointed to this file.
 		we->file = this;
 		if (we->type()->as_entity()) {
+			if (id == -1) {
 				we->set_id(FreshId());
+			} else {
+				we->set_id((unsigned int)id);
+				if ((unsigned) id > MaxId) {
+					MaxId = (unsigned)id;
+				}
+			}
 		}
 
 		// @todo entity_file_map: use weak_ptr
@@ -1754,9 +1765,15 @@ if (ty->as_entity()) {
 		if (!new_entity->data().file) {
 			// For newly created entities ensure a valid ENTITY_INSTANCE_NAME is set
 			new_entity->data().file = this;
-		new_id = new_entity->data().set_id();
+			boost::optional<unsigned> id_value;
+			if (id != -1) {
+				id_value = (unsigned)id;
+				if ((unsigned)id > MaxId) {
+					MaxId = (unsigned)id;
 				}
-	else {
+			}
+			new_id = new_entity->data().set_id(id_value);
+		} else {
 			new_id = new_entity->data().id();
 		}