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A library of composable components enabling simpler Computational Intelligence

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/**           __  __
 *    _____ _/ /_/ /_    Computational Intelligence Library (CIlib)
 *   / ___/ / / / __ \   (c) CIRG @ UP
 *  / /__/ / / / /_/ /   http://cilib.net
 *  \___/_/_/_/_.___/
 */
package net.sourceforge.cilib.pso.dynamic.detectionstrategies;


import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import net.sourceforge.cilib.algorithm.Algorithm;
import net.sourceforge.cilib.algorithm.population.HasNeighbourhood;
import net.sourceforge.cilib.algorithm.population.HasTopology;

import net.sourceforge.cilib.entity.Entity;
import net.sourceforge.cilib.math.random.generator.Rand;
import net.sourceforge.cilib.pso.dynamic.DynamicParticle;
import net.sourceforge.cilib.pso.particle.Particle;

public class RandomSentryDetectionStrategy extends EnvironmentChangeDetectionStrategy {
    private static final long serialVersionUID = 6254159986113630555L;

    private int sentries;
    private double theta;
    private int[] sentryIDs;
    private boolean initialised = false;
    ArrayList sentryList;

    public RandomSentryDetectionStrategy() {
        sentries = 1;
        theta = 0.001;
    }

    public  void Initialise(A algorithm){
        sentryIDs = new int[sentries];
        int populationSize = algorithm.getTopology().length();

        //randomly select the sentries among the particles
        for(int i=0; i topology = algorithm.getTopology();
        this.sentryList = new ArrayList();
        Iterator iterator = topology.iterator();

        int sentryCounter = 0;
        while (iterator.hasNext() && sentryCounter boolean detect(A algorithm) {
        if(initialised == false){
            this.Initialise(algorithm);
        }
        boolean envChangeOccured = false;

        for (Particle nextSentry : sentryList) {
            double oldSentryFitness = nextSentry.getFitness().getValue();
            double newSentryFitness = algorithm.getOptimisationProblem().getFitness(nextSentry.getPosition()).getValue();

            if(Math.abs(oldSentryFitness - newSentryFitness) >=  theta) {
                envChangeOccured = true;
                break;
            }
        }
        return envChangeOccured;
    }

    /**
     * @return the sentries
     */
    public int getSentries() {
        return sentries;
    }

    /**
     * @param sentries the sentries to set
     */
    public void setSentries(int sentries) {
        this.sentries = sentries;
    }

    /**
     * @return the theta
     */
    public double getTheta() {
        return theta;
    }

    /**
     * @param theta the theta to set
     */
    public void setTheta(double theta) {
        this.theta = theta;
    }
}