/*
- * Jalview - A Sequence Alignment Editor and Viewer (Version 2.7)
- * Copyright (C) 2011 J Procter, AM Waterhouse, J Engelhardt, LM Lui, 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.
*
* Jalview is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
- *
+ *
* Jalview is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* 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) {
+ 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)
{
instances = new java.util.IdentityHashMap<StructureSelectionManagerProvider, StructureSelectionManager>();
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;
}