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

 import java.util.Collection;

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

 import org.kuali.rice.krms.api.engine.ResultEvent;

 import org.kuali.rice.krms.api.engine.Term;

 import org.kuali.rice.krms.api.engine.TermResolutionException;

 import org.kuali.rice.krms.framework.engine.result.BasicResult;

 public class CollectionOfComparablesTermBasedProposition<T> extends ComparableTermBasedProposition<T> {

         private static final ResultLogger LOG = ResultLogger.getInstance();

         private CollectionOperator collectionOper;

         private Term term;

         public CollectionOfComparablesTermBasedProposition(CollectionOperator collectionOper, ComparisonOperator compareOper, Term term, T expectedValue) {

                 super(compareOper, term, expectedValue);

                 this.term = term;

                 this.collectionOper = collectionOper;

         }

         /**

          * @see org.kuali.rice.krms.framework.engine.ComparableTermBasedProposition#evaluate(org.kuali.rice.krms.api.engine.ExecutionEnvironment)

          * @throws TermResolutionException if there is a problem resolving a {@link Term}

          */

         @Override

         public boolean evaluate(ExecutionEnvironment environment) {

                 boolean collatedResult = collectionOper.getInitialCollatedResult();

                 Collection<? extends Comparable<T>> termValue;

                 termValue = environment.resolveTerm(term);

                 if (termValue != null) {

                         for (Comparable<T> item : termValue) {

                                 collatedResult = collectionOper.reduce(compare(item), collatedResult);

                                 if (collectionOper.shortCircuit(collatedResult)) break;

                         }

                 }

                 // TODO: log this appropriately

                 if (LOG.isEnabled(environment)) {

                         LOG.logResult(new BasicResult(ResultEvent.PropositionEvaluated, this, environment, collatedResult));

                 }

                 return collatedResult;

         }

         public String toString() {

                 StringBuilder sb = new StringBuilder();

                 sb.append(collectionOper.toString());

                 sb.append(" "+super.toString());

                 return sb.toString();

         }

 }