changed: there is one dir called root (has parent_id -1)

(we have an owner, group, privileges etc of the root dir)
         the root.id of course is not -1 


git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@468 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/dircontainer.cpp

@@ -13,6 +13,17 @@
 
 DirContainer::DirContainer()
 {
+	is_root = false;
+}
+
+
+
+DirContainer::Iterator DirContainer::GetRoot()
+{
+	if( !is_root )
+		return table.end();
+		
+return table.begin() + root_index;
 }
 
 
@@ -40,6 +51,7 @@ bool DirContainer::Empty()
 }
 
 
+
 void DirContainer::PushBack(const Item & item)
 {
 bool rebuild_indexes = false;
@@ -47,8 +59,21 @@ bool rebuild_indexes = false;
 	if( table.size() == table.capacity() )
 		rebuild_indexes = true;
 
+
+	if( item.parent_id == -1 )
+	{
+		if( is_root )
+			log << log1 << "DirCont: more than one root dir - skipped, id: " << item.id << logend;
+		else
+		{
+			is_root = true;
+			root_index = table.size();
+		}
+	}
+
 	table.push_back(item);
 	log << log2 << "DirCont: added item, id: " << item.id << ", parent_id: " << item.parent_id << logend;
+
 	
 	if( rebuild_indexes )
 		RebuildIndexes();