source: src/main/java/agents/anac/y2015/group2/G2ParetoFinder.java

package agents.anac.y2015.group2;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Map.Entry;
import java.util.Set;

class G2ParetoFinder
{
        ArrayList<G2IssueSubSet> issueSubSets;
        G2ParetoFinder(G2UtilitySpace ourUtilitySpace, ArrayList<G2UtilitySpace> OtherUtilitySpaces)
        {
                issueSubSets = new ArrayList<G2IssueSubSet>();
                Set<Entry<String, G2Issue>> issues = ourUtilitySpace.getIssues();
                for(Entry<String, G2Issue> issueInfo: issues)
                {
                        String IssueName = issueInfo.getKey();
                        G2Issue issue = issueInfo.getValue();
                        LinkedList<G2SubBid> subBids = new LinkedList<G2SubBid>();
                        
                        Set<String> optionNames = issue.getOptionNames();
                        for(String optionName: optionNames)
                        {
                                ArrayList<Double> OtherUtilities = new ArrayList<Double>(OtherUtilitySpaces.size());
                                for(G2UtilitySpace utilitySpace: OtherUtilitySpaces)
                                {
                                        OtherUtilities.add(utilitySpace.calculateOptionUtility(IssueName, optionName));
                                }
                                double ourUtility = ourUtilitySpace.calculateOptionUtility(IssueName, optionName);
                                subBids.add(new G2SubBid(optionName, ourUtility, OtherUtilities));
                        }
                        issueSubSets.add(new G2IssueSubSet(IssueName, subBids));
                }
        }
        
        private void trimMerge() {
                for(G2IssueSubSet subSet: issueSubSets)
                {
                        subSet.trimSubBids();
                }
                
                ArrayList<G2IssueSubSet> newIssueSubSets = new ArrayList<G2IssueSubSet>();
                int i=1;
                while(i<issueSubSets.size())
                {
                        newIssueSubSets.add(new G2IssueSubSet(issueSubSets.get(i-1), issueSubSets.get(i)));
                        i+=2;
                }
                if(i==issueSubSets.size())
                {
                        newIssueSubSets.add(issueSubSets.get(i-1));
                }
                issueSubSets = newIssueSubSets;
        }
        
        ArrayList<G2Bid> findParetoOptimalBids() {
                while (issueSubSets.size()>1) {
                        trimMerge();
                }
                issueSubSets.get(0).trimSubBids();
                
                return issueSubSets.get(0).generateBids();
        }
}