/**
    * Copyright 2011 The Kuali Foundation Licensed under the Educational Community License, Version 2.0 (the "License"); you may not
    * use this file except in compliance with the License. You may obtain a copy of the License at
    *
    * http://www.osedu.org/licenses/ECL-2.0
    *
    * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
    * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language
    * governing permissions and limitations under the License.
   */
  package org.kuali.student.core.krms.proposition;
  
  import java.util.Date;
  import org.kuali.rice.krms.api.engine.ExecutionEnvironment;
  import org.kuali.rice.krms.api.engine.ResultEvent;
  import org.kuali.rice.krms.framework.engine.PropositionResult;
  import org.kuali.rice.krms.framework.engine.result.BasicResult;
  import org.kuali.student.common.util.krms.RulesExecutionConstants;
  import org.kuali.student.common.util.krms.proposition.AbstractLeafProposition;
  
  /**
   * This proposition is used to evaluate whether or not a person is alive
   *
   * @author alubbers
   */
  public class IsAliveProposition extends AbstractLeafProposition {
  
      @Override
      public PropositionResult evaluate(ExecutionEnvironment environment) {
          Date deceasedDate = environment.resolveTerm(RulesExecutionConstants.STUDENT_DECEASED_DATE_TERM, this);
  
          if (deceasedDate == null) {
              return this.recordResultWithNoDetails(environment, true);
          }
          return this.recordResultWithNoDetails(environment, false);
      }
  }