source: src/main/java/parties/in4010/q12015/group17/AcceptStrategy.java@ 126

package parties.in4010.q12015.group17;

import genius.core.Bid;
import genius.core.timeline.TimeLineInfo;
import genius.core.utility.AbstractUtilitySpace;

/**
 * This class is responsible for determining whether to accept a bid or not.
 * Though it is currently only a single method, for the sake of future expansion
 * as well as proper segregation it has been placed in its own class.
 */
public class AcceptStrategy {

        private final AbstractUtilitySpace utilitySpace;
        private final TimeLineInfo timeline;

        public AcceptStrategy(AbstractUtilitySpace us, TimeLineInfo t) {
                this.utilitySpace = us;
                this.timeline = t;
        }

        /**
         * Determines if the given bid is acceptable according to the current time.
         * 
         * @param b
         *            The {@link Bid} to evaluate.
         * @return {@code TRUE} if this {@link Bid} should be accepted, otherwise
         *         {@code FALSE}.
         */
        public boolean determineAcceptability(Bid b) {
                try {
                        double utility = utilitySpace.getUtility(b);
                        double time = timeline.getTime();

                        // First part of concession. A sinoid decay from 1 to 0.8 utility
                        // over 0<t<0.8.
                        if (time <= 0.8)
                                return utility > 1 + (0.1 * ((Math.cos(time * Math.PI * 1.25) - 1)));
                        // Fourth part. A linear decay from 0.6 to 0.55 over 0.985 < t < 1.
                        else if (time > 0.985)
                                return utility > 0.6 - ((time - 0.985) / 0.015) * 0.05;
                        // Third part. A linear decay from 0.7 to 0.6 over 0.95<t<0.985.
                        else if (time > 0.95)
                                return utility > 0.7 - ((time - 0.95) / 0.035) * 0.1;
                        // Second part. A linear decay from 0.8 to 0.7 over 0.8<t<0.95.
                        else if (time > 0.8)
                                return utility > 0.8 - ((time - 0.8) / 0.15) * 0.1;
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return false;
        }
}