source: src/main/java/parties/in4010/q12015/group7/EnhancedBidHistory.java@ 3

package parties.in4010.q12015.group7;

import java.util.ArrayList;
import java.util.List;

import genius.core.Bid;
import genius.core.BidHistory;
import genius.core.bidding.BidDetails;
import genius.core.issue.Issue;

/**
 * Enhancement of the default BidHistory which in addition keeps record of the
 * distance of every bid compared to the previous bid.
 * 
 * @author svanbekhoven
 *
 */
public class EnhancedBidHistory extends BidHistory {
        /**
         * Serial for serializing purposes
         */
        private static final long serialVersionUID = 6182046030452141299L;

        /**
         * ArrayList containing the distances of each bid towards the previous bid
         */
        private ArrayList<Double> bidDistances;

        /**
         * Constructor
         */
        public EnhancedBidHistory() {
                this.bidDistances = new ArrayList<Double>();
        }

        /**
         * Besides adding the bid to the BidHistory, also add the distance between
         * the bid to be added and the previous bid to the ArrayList.
         */
        public void add(BidDetails details) {
                if (this.getLastBid() != null) {
                        bidDistances.add(distance(details.getBid(), this.getLastBid()));
                }
                super.add(details);
        }

        /**
         * Return "toughness" of the bids in this BidHistory Toughness means the
         * average distance of the last x bids
         * 
         * @param numberOfBids
         * @return toughness
         */
        public double getToughness(int numberOfBids) {
                if (this.bidDistances.size() == 0)
                        return 1;

                double sum = 0.0;
                int count = 0;
                for (int i = this.bidDistances.size() - 1; i >= Math.max(0,
                                this.bidDistances.size() - numberOfBids - 1); i--) {
                        sum += this.bidDistances.get(i);
                        count += 1;
                }

                return sum / ((double) count);
        }

        /**
         * Calculates the distance between two bids
         * 
         * @param bid1
         * @param bid2
         * @return distance = (number of differing issues between bid1 and bid2) /
         *         (number of issues)
         */
        public double distance(Bid bid1, Bid bid2) {
                double distance = 0;
                List<Issue> issues = bid1.getIssues();
                for (Issue issue : issues) {
                        try {
                                if (!bid1.getValue(issue.getNumber()).equals(
                                                bid2.getValue(issue.getNumber()))) {
                                        distance += 1.0 / ((double) issues.size());
                                }
                        } catch (Exception e) {
                                e.printStackTrace();
                        }
                }
                return distance;
        }

        public String toString() {
                String res = "EnhancedBidHistory[";
                for (BidDetails bd : getHistory()) {
                        res += "(" + bd.getMyUndiscountedUtil() + ", " + bd.getBid()
                                        + "\n\r";
                }
                return res + "]";
        }
}