source: src/main/java/negotiator/boaframework/offeringstrategy/anac2010/IAMhaggler2010/SpecialTimeConcessionFunction.java

package negotiator.boaframework.offeringstrategy.anac2010.IAMhaggler2010;

public class SpecialTimeConcessionFunction extends ConcessionFunction {

        private double beta;
        private double breakoff;
        private double defaultBeta;

        public SpecialTimeConcessionFunction(double beta, double defaultBeta, double breakoff) {
                this.beta = beta;
                this.breakoff = breakoff;
                this.defaultBeta = defaultBeta;
        }

        @Override
        public double getConcession(double startUtility, long currentTime, double totalTime) {
                double utilityBeta = startUtility - (startUtility - breakoff) * Math.pow(currentTime / totalTime, 1.0 / beta);
                double utilityDefaultBeta = startUtility - (startUtility - breakoff) * Math.pow(currentTime / totalTime, 1.0 / defaultBeta);
                double gamePercent = currentTime / totalTime;
                if(gamePercent < 0.2)
                {
                        return utilityDefaultBeta;
                }
                if(gamePercent < 0.4)
                {
                        return (utilityDefaultBeta * (1 - ((gamePercent - 0.2)/0.2))) + (utilityBeta * ((gamePercent - 0.2)/0.2));
                }
                return utilityBeta;
        }
}