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

package negotiator.boaframework.acceptanceconditions.other;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;

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

/**
 * This Acceptance Condition accepts an opponent bid if the utility is higher
 * than the previous bid the agent made.
 * 
 * Decoupling Negotiating Agents to Explore the Space of Negotiation Strategies
 * T. Baarslag, K. Hindriks, M. Hendrikx, A. Dirkzwager, C.M. Jonker
 * 
 * @author Alex Dirkzwager, Mark Hendrikx
 */
public class AC_Previous extends AcceptanceStrategy {

        private double a;
        private double b;

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

        public AC_Previous(NegotiationSession negoSession, double alpha, double beta) {
                this.negotiationSession = negoSession;
                this.a = alpha;
                this.b = beta;
        }

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

        @Override
        public String printParameters() {
                String str = "[a: " + a + " b: " + b + "]";
                return str;
        }

        @Override
        public Actions determineAcceptability() {
                if (!negotiationSession.getOwnBidHistory().getHistory().isEmpty()) {
                        double opponentBidUtil = negotiationSession.getOpponentBidHistory().getLastBidDetails()
                                        .getMyUndiscountedUtil();
                        double ownLastBidUtil = negotiationSession.getOwnBidHistory().getLastBidDetails().getMyUndiscountedUtil();
                        if (a * opponentBidUtil + b >= ownLastBidUtil) {
                                return Actions.Accept;
                        }
                }
                return Actions.Reject;

        }

        @Override
        public Set<BOAparameter> getParameterSpec() {

                Set<BOAparameter> set = new HashSet<BOAparameter>();
                set.add(new BOAparameter("a", 1.0,
                                "Accept when the opponent's utility * a + b is greater than the utility of our previous bid"));
                set.add(new BOAparameter("b", 0.0,
                                "Accept when the opponent's utility * a + b is greater than the utility of our previous bid"));

                return set;
        }

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