package org.jtheque.primary.view.impl.models;

 /*

  * This file is part of JTheque.

  *

  * JTheque is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, either version 3 of the License.

  *

  * JTheque is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with JTheque.  If not, see <http://www.gnu.org/licenses/>.

  */

 import org.jtheque.core.managers.persistence.able.DataContainer;

 import org.jtheque.core.managers.persistence.able.DataListener;

 import org.jtheque.core.managers.persistence.able.Entity;

 import org.jtheque.primary.od.able.Data;

 import javax.swing.DefaultComboBoxModel;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.List;

 /**

  * A combo box model with the data in a cache.

  *

  * @author Baptiste Wicht

  * @param <T> The entity class on the model.

  */

 public final class DataContainerCachedComboBoxModel<T extends Data> extends DefaultComboBoxModel implements DataListener {

         private final DataContainer<T> container;

         private List<T> datas;

         /**

          * Construct a new DataContainerCachedComboBoxModel with a specific container.

          *

          * @param container The data container.

          */

         public DataContainerCachedComboBoxModel(DataContainer<T> container){

                 super();

                 this.container = container;

                 datas = new ArrayList<T>(container.getDatas());

                 container.addDataListener(this);

         }

         @Override

         public Object getElementAt(int index){

                 return datas.get(index);

         }

         @Override

         public int getSize(){

                 return getDatas().size();

         }

         /**

          * Return the selected data in the model.

          *

          * @return The data who's selected.

          */

         @SuppressWarnings("unchecked")

         public T getSelectedData(){

                 return (T) getSelectedItem();

         }

         @Override

         public void dataChanged(){

                 datas = new ArrayList<T>(container.getDatas());

                 fireContentsChanged(this, 0, getSize());

         }

         /**

          * Return the datas.

          *

          * @return The datas.

          */

         private Collection<? extends Entity> getDatas(){

                 return datas;

         }

         /**

          * Select the first element. If there is no element, nothing will be done.

          */

         public void selectFirst(){

                 if (!datas.isEmpty()){

                         setSelectedItem(datas.get(0));

                 }

         }

 }