source: exampleparties/comparebids/src/main/java/geniusweb/exampleparties/comparebids/CompareBids.java@ 52

package geniusweb.exampleparties.comparebids;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;

import geniusweb.actions.Action;
import geniusweb.actions.Comparison;
import geniusweb.actions.ElicitComparison;
import geniusweb.actions.PartyId;
import geniusweb.inform.ActionDone;
import geniusweb.inform.Finished;
import geniusweb.inform.Inform;
import geniusweb.inform.Settings;
import geniusweb.issuevalue.Bid;
import geniusweb.party.Capabilities;
import geniusweb.party.DefaultParty;
import geniusweb.profile.PartialOrdering;
import geniusweb.profile.Profile;
import geniusweb.profileconnection.ProfileConnectionFactory;
import geniusweb.profileconnection.ProfileInterface;
import tudelft.utilities.logging.Reporter;

/**
 * A party following the COB protocol and thus answers {@link ElicitComparison}
 * questions. This party does not use a GUI but uses the given profile to
 * determine the answer.
 */
public class CompareBids extends DefaultParty {

        private PartyId me;
        protected ProfileInterface profileint;

        public CompareBids() {
        }

        public CompareBids(Reporter reporter) {
                super(reporter); // for debugging
        }

        @Override
        public void notifyChange(Inform info) {
                try {
                        if (info instanceof Settings) {
                                Settings settings = (Settings) info;
                                this.profileint = ProfileConnectionFactory
                                                .create(settings.getProfile().getURI(), getReporter());
                                this.me = settings.getID();
                        } else if (info instanceof ActionDone) {
                                Action action = ((ActionDone) info).getAction();
                                if (action instanceof ElicitComparison) {
                                        reply((ElicitComparison) action);
                                }
                        } else if (info instanceof Finished) {
                                terminate(); // stop this party and free resources.
                        } else {
                                reporter.log(Level.WARNING, "COB party ignores " + info);
                        }
                } catch (Exception e) {
                        throw new RuntimeException("Failed to handle info", e);
                }
        }

        @Override
        public Capabilities getCapabilities() {
                return new Capabilities(new HashSet<>(Arrays.asList("COB")),
                                Collections.singleton(PartialOrdering.class));
        }

        @Override
        public String getDescription() {
                return "compares a bid with a given list of other bids.";
        }

        /**
         * Handle the {@link ElicitComparison} and reply with {@link Comparison}.
         * This shoul dbe fast (assuming the request is reasonably sized) so we
         * handle this in-line instead of in separate thread.
         */
        private void reply(ElicitComparison compareRequest) throws IOException {
                List<Bid> better = new LinkedList<>();
                List<Bid> worse = new LinkedList<>();
                Profile profile1 = profileint.getProfile();
                if (!(profile1 instanceof PartialOrdering)) {
                        throw new IllegalStateException(
                                        "Profile must be a partial ordering");
                }
                PartialOrdering profile = (PartialOrdering) profile1;

                Bid bid = compareRequest.getBid();
                for (Bid otherbid : compareRequest.getOptions()) {
                        boolean betteroreq = profile.isPreferredOrEqual(otherbid, bid);
                        boolean worseoreq = profile.isPreferredOrEqual(bid, otherbid);
                        if (betteroreq && !worseoreq)
                                better.add(otherbid);
                        else if (worseoreq && !betteroreq)
                                worse.add(otherbid);
                }
                getConnection().send(new Comparison(me, bid, better, worse));
        }

}