package org.kuali.rice.krms.framework.engine;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.List;

 import java.util.Map;

 import org.kuali.rice.krms.api.Agenda;

 import org.kuali.rice.krms.api.AssetResolver;

 import org.kuali.rice.krms.api.Context;

 import org.kuali.rice.krms.api.ExecutionEnvironment;

 public class BasicContext implements Context {

         private Map<String, String> qualifiers;

         private List<Agenda> agendas;

         private List<AssetResolver<?>> assetResolvers;

         public BasicContext(Map<String, String> qualifiers, List<Agenda> agendas, List<AssetResolver<?>> assetResolvers) {

                 this.qualifiers = qualifiers;

                 this.agendas = agendas;

                 this.assetResolvers = assetResolvers;

         }

         @Override

         public void execute(ExecutionEnvironment environment) {

                 if (assetResolvers != null) for (AssetResolver<?> assetResolver : assetResolvers) {

                         environment.addAssetResolver(assetResolver);

                 }

                 List<Agenda> matchingAgendas = findMatchingAgendas(environment);

                 for (Agenda matchingAgenda : matchingAgendas) {

                         matchingAgenda.execute(environment);

                 }

         }

         protected List<Agenda> findMatchingAgendas(ExecutionEnvironment environment) {

                 List<Agenda> matchingAgendas = new ArrayList<Agenda>();

                 for (Agenda agenda : agendas) {

                         if (agenda.appliesTo(environment)) {

                                 matchingAgendas.add(agenda);

                         }

                 }

                 return matchingAgendas;

         }

         @Override

         public boolean appliesTo(ExecutionEnvironment environment) {

                 for (String contextQualifierName : qualifiers.keySet()) {

                         String qualifierValue = qualifiers.get(contextQualifierName);

                         String environmentQualifierValue = environment.getSelectionCriteria().getContextQualifiers().get(qualifierValue);

                         if (!qualifierValue.equals(environmentQualifierValue)) {

                                 return false;

                         }

                 }

                 return true;

         }

         public List<AssetResolver<?>> getAssetResolvers() {

                 return Collections.unmodifiableList(assetResolvers);

         }

 }