--- /dev/null
+/*
+ * Copyright (c) 2003-2005 The BISON Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+package peersim.vector;
+
+import peersim.core.*;
+import peersim.util.*;
+
+/**
+ * This class computes and reports statistics information about a vector.
+ * Provided statistics include average, max, min, variance,
+ * etc. Values are printed according to the string format of {@link
+ * IncrementalStats#toString}.
+ * @see VectControl
+ * @see peersim.vector
+ */
+public class VectorObserver extends VectControl {
+
+
+/** The name of this observer in the configuration */
+private final String prefix;
+
+
+//--------------------------------------------------------------------------
+//Initialization
+//--------------------------------------------------------------------------
+
+/**
+ * Standard constructor that reads the configuration parameters.
+ * Invoked by the simulation engine.
+ * @param prefix the configuration prefix for this class
+ */
+public VectorObserver(String prefix) {
+
+ super(prefix);
+ this.prefix = prefix;
+}
+
+//--------------------------------------------------------------------------
+// Methods
+//--------------------------------------------------------------------------
+
+/**
+ * Prints statistics information about a vector.
+ * Provided statistics include average, max, min, variance,
+ * etc. Values are printed according to the string format of {@link
+ * IncrementalStats#toString}.
+ * @return always false
+ */
+public boolean execute() {
+
+ IncrementalStats stats = new IncrementalStats();
+
+ for (int j = 0; j < Network.size(); j++)
+ {
+ Number v = getter.get(j);
+ stats.add( v.doubleValue() );
+ }
+
+ System.out.println(prefix+": "+stats);
+
+ return false;
+}
+
+}
