--- /dev/null
+/*******************************************************************************\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.Collection;\r
+import java.util.Collections;\r
+import java.util.concurrent.Executor;\r
+\r
+import org.simantics.databoard.accessor.Accessor.Listener;\r
+import org.simantics.databoard.accessor.event.Event;\r
+import org.simantics.databoard.accessor.interestset.InterestSet;\r
+import org.simantics.databoard.accessor.reference.ChildReference;\r
+
+/**
+ * ListenerEntry is a linked list of <Listener, InterestSet> pairs
+ *
+ * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
+ */
+public class ListenerEntry {
+
+ public Listener listener;
+ public InterestSet interestSet;
+ // Path from the listened object
+ public ChildReference path;\r
+ public Executor executor;
+ public ListenerEntry next;
+
+ public ListenerEntry(Listener listener, InterestSet interestSet, ChildReference path, Executor executor) {
+ if (interestSet==null) throw new IllegalArgumentException();
+ this.listener = listener;
+ this.interestSet = interestSet;
+ this.path = path;
+ this.executor = executor;\r
+ }
+
+ /**
+ * Add new entry to listener list
+ *
+ * @param prevValue
+ * @param listener
+ * @param interestSet
+ * @return the new assignment for the list
+ */
+ public static ListenerEntry link(ListenerEntry prevValue, Listener listener, InterestSet interestSet, ChildReference path, Executor executor) {
+ ListenerEntry e = new ListenerEntry(listener, interestSet, path, executor);
+ e.next = prevValue;
+ return e;
+ }
+
+ @SuppressWarnings("unchecked")
+ public <T extends InterestSet> T getInterestSet() {
+ return (T) interestSet;
+ }
+
+
+ /**
+ * Remove listener entry from linked list
+ *
+ * @param firstEntry
+ * @param listener the value to be removed
+ * @return the new assignment for the list
+ */
+ public static ListenerEntry remove(ListenerEntry firstEntry, Listener listener) {
+ ListenerEntry e = firstEntry;
+ ListenerEntry p = null;
+ while (e!=null) {
+ if (e.listener == listener) {
+ if (p==null) return e.next;
+ p.next = e.next;
+ return firstEntry;
+ }
+ p = e;
+ e = e.next;
+ }
+ return null;
+ }
+
+ /**
+ * Emits an event to the listener.
+ *
+ * NOTE, Event instance can be emited only once. This method writes to the
+ * e.reference field.
+ *
+ * @param e
+ */
+ public void emitEvent(final Event e) {
+// e.reference = ChildReference.concatenate(path, e.reference);\r
+ if (executor == null) {
+ listener.onEvents( Collections.singleton(e) );\r
+ } else {\r
+ executor.execute( new Runnable() {\r
+ public void run() {\r
+ listener.onEvents( Collections.singleton(e) );\r
+ }});\r
+ }
+ }
+\r
+ public void emitEvents(final Collection<Event> events) {\r
+// for (Event e : events) {\r
+// e.reference = ChildReference.concatenate(path, e.reference);\r
+// }\r
+ if (executor == null) {\r
+ listener.onEvents( events );\r
+ } else {\r
+ executor.execute( new Runnable() {\r
+ public void run() {\r
+ listener.onEvents( events );\r
+ }});\r
+ }\r
+ }\r
+
+}
+