-/*******************************************************************************\r
- * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
- * in Industry THTH ry.\r
- * All rights reserved. This program and the accompanying materials\r
- * are made available under the terms of the Eclipse Public License v1.0\r
- * which accompanies this distribution, and is available at\r
- * http://www.eclipse.org/legal/epl-v10.html\r
- *\r
- * Contributors:\r
- * VTT Technical Research Centre of Finland - initial API and implementation\r
- *******************************************************************************/\r
-package org.simantics.db.common.procedure.single;\r
-\r
-import java.util.HashSet;\r
-import java.util.Set;\r
-\r
-import org.simantics.db.procedure.Listener;\r
-\r
-abstract public class StagedSingleSetListener<T> implements Listener<Set<T>>{\r
- \r
- private Set<T> previous = null;\r
- \r
- public void start(Set<T> items) {}\r
- public void add(T item) {}\r
- public void remove(T item) {}\r
- \r
- @Override\r
- public synchronized void execute(final Set<T> result) {\r
- \r
- if(previous == null) {\r
-\r
- start(result);\r
-\r
- } else {\r
-\r
- HashSet<T> added = new HashSet<T>(result);\r
- added.removeAll(previous);\r
- HashSet<T> removed = new HashSet<T>(previous);\r
- removed.removeAll(result);\r
-\r
- for(T t : added) add(t);\r
- for(T t : removed) remove(t);\r
-\r
- }\r
-\r
- previous = result;\r
- \r
- }\r
- \r
-}\r
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.common.procedure.single;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.simantics.db.procedure.Listener;
+
+abstract public class StagedSingleSetListener<T> implements Listener<Set<T>>{
+
+ private Set<T> previous = null;
+
+ public void start(Set<T> items) {}
+ public void add(T item) {}
+ public void remove(T item) {}
+
+ @Override
+ public synchronized void execute(final Set<T> result) {
+
+ if(previous == null) {
+
+ start(result);
+
+ } else {
+
+ HashSet<T> added = new HashSet<T>(result);
+ added.removeAll(previous);
+ HashSet<T> removed = new HashSet<T>(previous);
+ removed.removeAll(result);
+
+ for(T t : added) add(t);
+ for(T t : removed) remove(t);
+
+ }
+
+ previous = result;
+
+ }
+
+}