source: src/main/java/negotiator/boaframework/acceptanceconditions/other/AC_CombiBestAvg.java

package negotiator.boaframework.acceptanceconditions.other;

import java.util.Map;

import genius.core.BidHistory;
import genius.core.boaframework.AcceptanceStrategy;
import genius.core.boaframework.Actions;
import genius.core.boaframework.NegotiationSession;
import genius.core.boaframework.OfferingStrategy;
import genius.core.boaframework.OpponentModel;

/**
 * This is the decoupled Acceptance Conditions Based on Tim Baarslag's paper on
 * Acceptance Conditions: "Acceptance Conditions in Automated Negotiation"
 * 
 * This Acceptance Condition averages the opponents bids (which are better than
 * the bid that was offered) made in the previous time window. If the bid is
 * higher than the average it will accept
 * 
 * Decoupling Negotiating Agents to Explore the Space of Negotiation Strategies
 * T. Baarslag, K. Hindriks, M. Hendrikx, A. Dirkzwager, C.M. Jonker
 * 
 * @author Alex Dirkzwager
 */
public class AC_CombiBestAvg extends AcceptanceStrategy {

        private double time;

        /**
         * Empty constructor for the BOA framework.
         */
        public AC_CombiBestAvg() {
        }

        public AC_CombiBestAvg(NegotiationSession negoSession, OfferingStrategy strat, double t) {
                this.negotiationSession = negoSession;
                this.offeringStrategy = strat;
                this.time = t;
        }

        @Override
        public void init(NegotiationSession negoSession, OfferingStrategy strat, OpponentModel opponentModel,
                        Map<String, Double> parameters) throws Exception {
                this.negotiationSession = negoSession;
                if (parameters.get("t") != null) {
                        time = parameters.get("t");
                } else {
                        throw new Exception("Paramaters were not correctly set");
                }
        }

        @Override
        public String printParameters() {
                return "[t: " + time + "]";
        }

        @Override
        public Actions determineAcceptability() {
                if (negotiationSession.getOpponentBidHistory().getLastBidDetails().getMyUndiscountedUtil() >= offeringStrategy
                                .getNextBid().getMyUndiscountedUtil()) {
                        return Actions.Accept;
                }

                if (negotiationSession.getTime() < time) {
                        return Actions.Reject;
                }

                double offeredUndiscountedUtility = negotiationSession.getOpponentBidHistory().getLastBidDetails()
                                .getMyUndiscountedUtil();
                double now = negotiationSession.getTime();
                double timeLeft = 1 - now;

                double window = timeLeft;
                BidHistory recentBetterBids = negotiationSession.getOpponentBidHistory()
                                .filterBetween(offeredUndiscountedUtility, 1, now - window, now);

                double avgOfBetterBids = recentBetterBids.getAverageUtility();
                double expectedUtilOfWaitingForABetterBid = avgOfBetterBids;

                if (offeredUndiscountedUtility >= expectedUtilOfWaitingForABetterBid)
                        return Actions.Accept;
                return Actions.Reject;
        }

        @Override
        public String getName() {
                return "Other - CombiBestAvg";
        }

}