source: ai2020/group6/UtilityBasedAcceptanceStrategy.java@ 5

package ai2020.group6;

import java.math.BigDecimal;
import java.util.List;
import java.util.stream.Collectors;

import ai2020.group6.IAcceptanceStrategy;
import geniusweb.actions.Offer;
import geniusweb.actions.Vote;
import geniusweb.actions.Votes;

/**
 * UtilityBasedAcceptanceStrategy accepts all bids whose utility exceeds the minimum
 * utility threshold provided by the getUtilityThreshold function.
 * 
 * @author Group 6
 */
public abstract class UtilityBasedAcceptanceStrategy implements IAcceptanceStrategy {

        protected Integer minPower;
        protected Integer maxPower;
        
        public UtilityBasedAcceptanceStrategy ( Integer minPower, Integer maxPower ) {
                this.minPower = minPower;
                this.maxPower = maxPower;
        }
        
        public abstract BigDecimal getUtilityThreshold ( MAState state );
        
        @Override
        public Votes acceptanceVote ( MAState state, List<Offer> offers ) {
                BigDecimal util = getUtilityThreshold(state);
                return new Votes(state.getId(), offers.stream()
                                .filter(offer -> {
                                        return state.getUtilitySpace().getUtility(offer.getBid()).compareTo(util) >= 0;
                                })
                                .map(offer -> new Vote(state.getId(), offer.getBid(), minPower, maxPower))
                                .collect(Collectors.toSet()));
        }

}