package org.kuali.student.lum.common.client.widgets;
   
   import java.util.HashMap;
   import java.util.List;
   import java.util.Map;
   
   import com.google.gwt.user.client.ui.ListBox;
   
   /**
   * Dropdown list components. Extends ListBox to add useful methods and support for underlying model.
   * Each item in dropdown list is associated with corresponding model item.
   *
   * @author Igor
   */
  public class DropdownList extends ListBox {
  
      /**
       * Components model.
       */
      private Map<String, Integer> model = new HashMap<String, Integer>();
  
      /**
       * Selected index.
       */
      private Integer index = 0;
  
      public DropdownList() {
      }
  
      public DropdownList(List<String> list) {
          for (String s : list) {
              addItem(s);
          }
      }
  
      @Override
      public void addItem(String value) {
          model.put(value, index++);
          super.addItem(value);
      }
  
      public void setSelectedItem(String value) {
          if (model.get(value) == null) {
              setSelectedIndex(0);
          } else {
              setSelectedIndex(model.get(value));
          }
      }
  
      public String getSelectedValue() {
          return getValue(getSelectedIndex());
      }
  
      public void setList(List<String> relationship) {
          for (String s : relationship) {
              addItem(s);
          }
      }
  
      public void reset() {
          setSelectedIndex(0);
      }
  
      public void clear() {
          super.clear();
          model.clear();
          index = 0;
      }
  
      public void removeItem(String value) {
          if (null != model.get(value)) {
              removeItem(model.get(value));
          }
      }
  }