/*

  * Copyright 2007 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php

  *

  * 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.enrollment.class2.courseoffering.keyvalue;

 import java.io.Serializable;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.Comparator;

 import java.util.List;

 import javax.xml.namespace.QName;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

 import org.kuali.rice.core.api.util.ConcreteKeyValue;

 import org.kuali.rice.core.api.util.KeyValue;

 import org.kuali.rice.krad.keyvalues.KeyValuesBase;

 import org.kuali.student.common.exceptions.DoesNotExistException;

 import org.kuali.student.common.exceptions.InvalidParameterException;

 import org.kuali.student.common.exceptions.MissingParameterException;

 import org.kuali.student.common.exceptions.OperationFailedException;

 import org.kuali.student.core.enumerationmanagement.dto.EnumeratedValueInfo;

 import org.kuali.student.core.enumerationmanagement.service.EnumerationManagementService;

 public class SubjectAreaKeyValues extends KeyValuesBase implements Serializable {

     private static final long serialVersionUID = 1L;

     private static final String SUBJECT_AREA_ENUM_KEY = "kuali.lu.subjectArea";

     private EnumerationManagementService enumService;

     private SubjectAreasComparator subjectAreasComparator = new SubjectAreasComparator();

     @Override

     public List<KeyValue> getKeyValues() {

         List<EnumeratedValueInfo> subjectAreas;

         try {

             subjectAreas = getEnumService().getEnumeratedValues(SUBJECT_AREA_ENUM_KEY, null, null, null);

             Collections.sort(subjectAreas, subjectAreasComparator);

         } catch (DoesNotExistException e) {

             throw new RuntimeException("No subject areas found! There should be some in the database", e);

         } catch (InvalidParameterException e) {

             throw new RuntimeException(e);

         } catch (MissingParameterException e) {

             throw new RuntimeException(e);

         } catch (OperationFailedException e) {

             throw new RuntimeException(e);

         }

         List<KeyValue> keyValues = new ArrayList<KeyValue>();

         for(EnumeratedValueInfo e : subjectAreas) {

             keyValues.add(new ConcreteKeyValue(e.getCode(), e.getValue()));

         }

         return keyValues;

     }

     protected EnumerationManagementService getEnumService() {

         if(enumService == null) {

             enumService = (EnumerationManagementService)GlobalResourceLoader.getService(new QName("http://student.kuali.org/wsdl/enumerationmanagement","EnumerationManagementService"));

         }

         return this.enumService;

     }

     private class SubjectAreasComparator implements Comparator {

         @Override

         public int compare(Object o1, Object o2) {

             if (!(o1 instanceof EnumeratedValueInfo) || !(o2 instanceof EnumeratedValueInfo)) {

                 throw new ClassCastException("Object not of type EnumeratedValueInfo.");

             }

             EnumeratedValueInfo enumeratedValue1 = (EnumeratedValueInfo) o1;

             EnumeratedValueInfo enumeratedValue2 = (EnumeratedValueInfo) o2;

             int result = enumeratedValue1.getValue().compareToIgnoreCase(enumeratedValue2.getValue());

             return result;

         }

     }

 }