chg: add a PeriodicClockListener that trigger a ClockListener at periodic times

Author: pictavien

lib/jbotsim-core/src/main/java/io/jbotsim/core/event/PeriodicClockListener.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2008 - 2020, Arnaud Casteigts and the JBotSim contributors <contact@jbotsim.io>
+ *
+ *
+ * This file is part of JBotSim.
+ *
+ * JBotSim is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * JBotSim 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with JBotSim.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+package io.jbotsim.core.event;
+
+import io.jbotsim.core.Topology;
+
+public class PeriodicClockListener extends FilteredClockListener {
+    private int period;
+
+    public PeriodicClockListener(Topology tp, ClockListener listener, int period) {
+        super(tp, listener);
+        this.period = period;
+    }
+
+    @Override
+    protected boolean shouldTriggerListener(Topology tp, int currentTime) {
+        return ((currentTime + 1) % period == 0);
+    }
+}