-/*
- * 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.*;
-
-/**
- * Observes the cosine angle between two vectors. The number which is output is
- * the inner product divided by the product of the length of the vectors.
- * All values are converted to double before processing.
- * <p>
- * This observer class can observe any protocol field containing a
- * primitive value, provided that the field is associated with a getter method
- * that reads it.
- * The methods to be used are specified through parameter {@value #PAR_METHOD1}
- * and {@value #PAR_METHOD2}.
- * <p>
- * Please refer to package {@link peersim.vector} for a detailed description of
- * this mechanism.
- */
-public class VectAngle implements Control
-{
-
-// --------------------------------------------------------------------------
-// Parameters
-// --------------------------------------------------------------------------
-
-/**
- * The first protocol to be observed.
- * @config
- */
-private static final String PAR_PROT1 = "protocol1";
-
-/**
- * The second protocol to be observed.
- * @config
- */
-private static final String PAR_PROT2 = "protocol2";
-
-/**
- * The getter method used to obtain the values of the first protocol.
- * Defaults to <code>getValue</code> (for backward compatibility with previous
- * implementation of this class, that were based on the
- * {@link SingleValue} interface).
- * Refer to the {@linkplain peersim.vector vector package description} for more
- * information about getters and setters.
- * @config
- */
-private static final String PAR_METHOD1 = "getter1";
-
-/**
- * The getter method used to obtain the values of the second protocol.
- * Defaults to <code>getValue</code> (for backward compatibility with previous
- * implementation of this class, that were based on the
- * {@link SingleValue} interface).
- * Refer to the {@linkplain peersim.vector vector package description} for more
- * information about getters and setters.
- * @config
- */
-private static final String PAR_METHOD2 = "getter2";
-
-// --------------------------------------------------------------------------
-// Fields
-// --------------------------------------------------------------------------
-
-/** The prefix for this observer*/
-private final String name;
-
-private final Getter getter1;
-
-private final Getter getter2;
-
-// --------------------------------------------------------------------------
-// Initialization
-// --------------------------------------------------------------------------
-
-/**
- * Standard constructor that reads the configuration parameters.
- * Invoked by the simulation engine.
- * @param prefix the configuration prefix for this class
- */
-public VectAngle(String prefix)
-{
- name = prefix;
- getter1 = new Getter(prefix,PAR_PROT1,PAR_METHOD1);
- getter2 = new Getter(prefix,PAR_PROT2,PAR_METHOD2);
-}
-
-// --------------------------------------------------------------------------
-// Methods
-// --------------------------------------------------------------------------
-
-/**
- * Observes the cosine angle between two vectors. The printed values
- * are: cosine, Eucledian norm of vect 1, Eucledian norm of vector 2,
- * angle in radians.
-* @return always false
-*/
-public boolean execute() {
-
- double sqrsum1 = 0, sqrsum2 = 0, prod = 0;
- for (int i = 0; i < Network.size(); ++i)
- {
- double v1= getter1.get(i).doubleValue();
- double v2= getter2.get(i).doubleValue();
- sqrsum1 += v1 * v1;
- sqrsum2 += v2 * v2;
- prod += v2 * v1;
- }
-
- double cos = prod / Math.sqrt(sqrsum1) / Math.sqrt(sqrsum2);
-
- // deal with numeric errors
- if( cos > 1 ) cos=1;
- if( cos < -1 ) cos = -1;
-
- System.out.println(name+": " + cos + " "
- + Math.sqrt(sqrsum1) + " " + Math.sqrt(sqrsum2) + " "
- + Math.acos(cos));
- return false;
-}
-
-//--------------------------------------------------------------------------
-
-}
