Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.databoard / src / org / simantics / databoard / accessor / impl / EventCollection.java

diff --git a/bundles/org.simantics.databoard/src/org/simantics/databoard/accessor/impl/EventCollection.java b/bundles/org.simantics.databoard/src/org/simantics/databoard/accessor/impl/EventCollection.java
new file mode 100644 (file)
index 0000000..b2a6f8d
--- /dev/null
+++ b/bundles/org.simantics.databoard/src/org/simantics/databoard/accessor/impl/EventCollection.java
@@ -0,0 +1,90 @@
+/*******************************************************************************\r
+ *  Copyright (c) 2010 Association for Decentralized Information Management in\r
+ *  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.databoard.accessor.impl;
+
+import java.util.ArrayList;\r
+import java.util.Collection;\r
+import java.util.List;\r
+\r
+import org.simantics.databoard.accessor.Accessor.Listener;\r
+import org.simantics.databoard.accessor.event.Event;\r
+import org.simantics.databoard.accessor.event.ModificationEvent;\r
+
+/**
+ * Event Collection is a {@link Listener} implementation that collects events.
+ *
+ * @see ModificationEvent
+ * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
+ */
+public class EventCollection implements Listener {
+
+       public List<Event> events = new ArrayList<Event>();
+       
+       public synchronized void addEvent(Event event) {\r
+               this.events.add(event);\r
+       }\r
+               \r
+       public synchronized void addEvents(Collection<Event> events) {\r
+               this.events.addAll(events);\r
+       }\r
+               \r
+       /**
+        * Returns events and clears change set.
+        * 
+        * @return the list of events
+        */
+       public synchronized List<Event> getAndClearEvents() {
+               List<Event> result = events;
+               events = new ArrayList<Event>();
+               return result;
+       }
+       
+       public synchronized boolean isEmpty() {
+               return events.isEmpty();
+       }
+       
+       /**
+        * Get a snapshot of events.
+        * 
+        * @return a copy of events
+        */
+       public synchronized List<Event> getEvents() {
+               return new ArrayList<Event>( events );
+       }
+
+       @Override
+       public void onEvents(Collection<Event> events) {
+               addEvents(events);
+       }
+       
+       @Override
+       public synchronized String toString() {
+               StringBuilder sb = new StringBuilder();
+               sb.append('[');
+               int len = events.size();
+               if (len>1) sb.append("\n ");
+               for (int i=0; i<len; i++) {
+                       Event e = events.get(i);
+                       if (i>0) sb.append("\n ");
+                       sb.append(e.toString());
+               }
+               if (len>1) sb.append('\n');
+               sb.append(']');
+               return sb.toString();
+       }
+
+       public synchronized void clear() {
+               events.clear();
+       }
+       
+}
+