--- /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.transport;
+
+import java.io.*;
+
+import peersim.config.*;
+import peersim.core.*;
+
+/**
+ * Initializes static singleton {@link E2ENetwork} by reading a trace
+ * file containing the latency distance measured between a set of
+ * "virtual" routers. Latency is assumed to be symmetric, so the
+ * latency between x and y is equal to the latency to y and x.
+ *
+ * The format of the file is as follows: all values are stored as
+ * integers. The first value is the number of nodes considered.
+ * The rest of the values correspond to a "strictly upper triangular
+ * matrix" (see this
+ * <a href="http://en.wikipedia.org/w/index.php?title=Triangular_matrix&oldid=82411128">
+ * link</a>), ordered first by row than by column.
+ *
+ * @author Alberto Montresor
+ * @version $Revision: 1.4 $
+ */
+public class TriangularMatrixParser implements Control
+{
+
+// ---------------------------------------------------------------------
+// Parameters
+// ---------------------------------------------------------------------
+
+/**
+ * This configuration parameter identifies the filename of the file
+ * containing the measurements. First, the file is used as a pathname
+ * in the local file system. If no file can be identified in this way,
+ * the file is searched in the local classpath. If the file cannot be
+ * identified again, an error message is reported.
+ * @config
+ */
+private static final String PAR_FILE = "file";
+
+/**
+ * The ratio between the time units used in the configuration file and the
+ * time units used in the Peersim simulator.
+ * @config
+ */
+private static final String PAR_RATIO = "ratio";
+
+// ---------------------------------------------------------------------
+// Fields
+// ---------------------------------------------------------------------
+
+/** Name of the file containing the measurements. */
+private String filename;
+
+/** Ratio read from PAR_RATIO */
+private double ratio;
+
+// ---------------------------------------------------------------------
+// Initialization
+// ---------------------------------------------------------------------
+
+/**
+ * Read the configuration parameters.
+ */
+public TriangularMatrixParser(String prefix)
+{
+ filename = Configuration.getString(prefix + "." + PAR_FILE);
+ ratio = Configuration.getDouble(prefix + "." + PAR_RATIO);
+}
+
+// ---------------------------------------------------------------------
+// Methods
+// ---------------------------------------------------------------------
+
+/**
+ * Initializes static singleton {@link E2ENetwork} by reading a king data set.
+* @return always false
+*/
+public boolean execute()
+{
+ try {
+ ObjectInputStream in = null;
+ try {
+ in = new ObjectInputStream(
+ new BufferedInputStream(
+ new FileInputStream(filename)));
+ System.err.println("TriangularMatrixParser: Reading " + filename + " from local file system");
+ } catch (FileNotFoundException e) {
+ in = new ObjectInputStream(
+ new BufferedInputStream(
+ ClassLoader.getSystemResourceAsStream(filename)));
+ System.err.println("TriangularMatrixParser: Reading " + filename + " through the class loader");
+ }
+
+ // Read the number of nodes in the file (first four bytes).
+ int size = in.readInt();
+
+ // Reset the E2E network
+ E2ENetwork.reset(size, true);
+ System.err.println("TriangularMatrixParser: reading " + size + " rows");
+
+ // If the file format is not correct, data will be read
+ // incorrectly. Probably a good way to spot this is the
+ // presence of negative delays, or an end of file.
+
+ // Reading data
+ int count = 0;
+ for (int r=0; r < size; r++) {
+ for (int c = r+1; c < size; c++) {
+ int x = (int) (ratio*in.readInt());
+ count++;
+ E2ENetwork.setLatency(r,c,x);
+ }
+ }
+ System.err.println("TriangularMatrixParser: Read " + count + " entries");
+ } catch (IOException e) {
+ throw new RuntimeException(e.getMessage());
+ }
+ return false;
+}
+
+}
