source: src/main/java/agents/anac/y2010/Southampton/IAMhaggler.java

package agents.anac.y2010.Southampton;

import agents.anac.y2010.Southampton.similarity.LinearSimilarityAgent;
import agents.anac.y2010.Southampton.utils.concession.SpecialTimeConcessionFunction;
import agents.anac.y2010.Southampton.utils.concession.TimeConcessionFunction;
import genius.core.SupportedNegotiationSetting;

/**
 * @author Colin Williams The IAMhaggler Agent, created for ANAC 2010. Designed
 *         by C. R. Williams, V. Robu, E. Gerding and N. R. Jennings.
 * 
 */
public class IAMhaggler extends LinearSimilarityAgent {

        /**
         * The lowest target we have tried to use (initialised to 1).
         */
        private double lowestTarget = 1.0;

        /**
         * The minimum discounting factor.
         */
        private final double minDiscounting = 0.1;

        /**
         * The minimum beta value, which stops the agent from becoming too tough.
         */
        private final double minBeta = 0.01;

        /**
         * The maximum beta value, which stops the agent from becoming too weak.
         */
        private double maxBeta = 2.0;

        /**
         * The default value for beta, used when there is not enough information to
         * perform the linear regression.
         */
        private double defaultBeta = 1;

        /**
         * The minimum target value when the opponent is considered to be a
         * hardhaed.
         */
        private final double hardHeadTarget = 0.8;

        /*
         * (non-Javadoc)
         * 
         * @see agents.southampton.similarity.SimilarityAgent#init()
         */
        @Override
        public void init() {
                super.init();
                int discreteCombinationCount = this.bidSpace
                                .getDiscreteCombinationsCount();
                if (this.bidSpace.isContinuousWeightsZero()) {
                        defaultBeta = Math.min(0.5,
                                        Math.max(0.0625, discreteCombinationCount * 0.001));
                        if (utilitySpace.isDiscounted()) {
                                maxBeta = (2.0 + (4.0
                                                * Math.min(0.5, utilitySpace.getDiscountFactor())))
                                                * defaultBeta;
                        } else {
                                maxBeta = 2.0 + 4.0 * defaultBeta;
                        }
                }
        }

        /*
         * (non-Javadoc)
         * 
         * @see agents.southampton.similarity.VariableConcessionSimilarityAgent#
         * getTargetUtility(double, double)
         */
        @Override
        protected double getTargetUtility(double myUtility, double oppntUtility) {
                double currentTime = timeline.getTime() * timeline.getTotalTime()
                                * 1000;
                double beta = bidSpace.getBeta(bestOpponentBidUtilityHistory,
                                timeline.getTime(), utility0, utility1, minDiscounting, minBeta,
                                maxBeta, defaultBeta, currentTime, currentTime);

                cf = new SpecialTimeConcessionFunction(beta, defaultBeta,
                                TimeConcessionFunction.DEFAULT_BREAKOFF);

                double target = super.getTargetUtility(myUtility, oppntUtility);

                lowestTarget = Math.min(target, lowestTarget);

                if (opponentIsHardHead) {
                        return Math.max(hardHeadTarget, lowestTarget);
                }
                return lowestTarget;
        }

        /*
         * (non-Javadoc)
         * 
         * @see negotiator.Agent#getName()
         */
        @Override
        public String getName() {
                return "IAMhaggler";
        }

        /**
         * @return
         */
        @Override
        public String getVersion() {
                return "2.0 (Genius 3.1)";
        }

        @Override
        public SupportedNegotiationSetting getSupportedNegotiationSetting() {
                return SupportedNegotiationSetting.getLinearUtilitySpaceInstance();
        }

        @Override
        public String getDescription() {
                return "ANAC2010";
        }
}