/*
- * Jalview - A Sequence Alignment Editor and Viewer (Version 2.8)
- * Copyright (C) 2012 J Procter, AM Waterhouse, LM Lui, J Engelhardt, G Barton, M Clamp, S Searle
+ * Jalview - A Sequence Alignment Editor and Viewer (Version 2.8.1)
+ * Copyright (C) 2014 The Jalview Authors
*
* This file is part of Jalview.
*
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with Jalview. If not, see <http://www.gnu.org/licenses/>.
+ * The Jalview Authors are detailed in the 'AUTHORS' file.
*/
package jalview.structure;
}
Hashtable mappingData = new Hashtable();
-
+ private static StructureSelectionManager nullProvider = null;
public static StructureSelectionManager getStructureSelectionManager(
StructureSelectionManagerProvider context)
{
- if (context==null)
- {
- throw new Error("Implementation error. Structure selection manager's context is 'null'", new NullPointerException("SSM context is null"));
+ if (context==null) {
+ if (nullProvider == null)
+ {
+ if (instances != null)
+ {
+ throw new Error(
+ "Implementation error. Structure selection manager's context is 'null'",
+ new NullPointerException("SSM context is null"));
+ }
+ else
+ {
+ nullProvider = new StructureSelectionManager();
+ }
+ return nullProvider;
+ }
}
if (instances == null)
{
StructureSelectionManager instance = instances.get(context);
if (instance == null)
{
- instances.put(context, instance = new StructureSelectionManager());
+ if (nullProvider!=null)
+ {
+ instance = nullProvider;
+ } else {
+ instance = new StructureSelectionManager();
+ }
+ instances.put(context, instance);
}
return instance;
}