/**
    * Copyright 2005-2011 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.opensource.org/licenses/ecl2.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.rice.core.web.namespace;
  
  import org.kuali.rice.core.api.util.ConcreteKeyValue;
  import org.kuali.rice.core.api.util.KeyValue;
  import org.kuali.rice.core.impl.namespace.NamespaceBo;
  import org.kuali.rice.krad.keyvalues.KeyValuesBase;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.service.KeyValuesService;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  public class NamespaceValuesFinder extends KeyValuesBase {
  
      @Override
  	public List<KeyValue> getKeyValues() {
  
          // get a list of all Namespaces
          KeyValuesService boService = KRADServiceLocator.getKeyValuesService();
          List<NamespaceBo> bos = (List<NamespaceBo>) boService.findAll(NamespaceBo.class);
          // copy the list of codes before sorting, since we can't modify the results from this method
          if ( bos == null ) {
          	bos = new ArrayList<NamespaceBo>(0);
          } else {
          	bos = new ArrayList<NamespaceBo>( bos );
          }
  
          // sort using comparator.
          Collections.sort(bos, NamespaceComparator.INSTANCE); 
  
          // create a new list (code, descriptive-name)
          List<KeyValue> labels = new ArrayList<KeyValue>( bos.size() );
          labels.add(new ConcreteKeyValue("", ""));
          for ( NamespaceBo bo : bos ) {
              labels.add( new ConcreteKeyValue(bo.getCode(), bo.getName() ) );
          }
          return labels;
      }
  
      private static class NamespaceComparator implements Comparator<NamespaceBo> {
          public static final Comparator<NamespaceBo> INSTANCE = new NamespaceComparator();
  
          @Override
          public int compare(NamespaceBo o1, NamespaceBo o2) {
              return o1.getCode().compareTo( o2.getCode() );
          }
      }
  }