// Copyright 2008 Thiago H. de Paula Figueiredo

 //

 // Licensed under the Apache 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.apache.org/licenses/LICENSE-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 br.com.arsmachina.tapestrycrud.grid;

 import java.io.Serializable;

 import java.util.List;

 import org.apache.tapestry5.grid.GridDataSource;

 import br.com.arsmachina.controller.Controller;

 import br.com.arsmachina.controller.ReadableController;

 import br.com.arsmachina.dao.SortCriterion;

 /**

  * {@link GridDataSource} implementation using a {@link Controller} instance, specifically its

  * {@link Controller#findAll(int, int, SortCriterion[])} method.

  * 

  * @param <T> the entity class related to this controller.

  * @param <K> the type of the field that represents the entity class' primary key.

  * @author Thiago H. de Paula Figueiredo

  */

 public class ControllerGridDataSource<T, K extends Serializable> extends

                 PagedSearchGridDataSource<T> {

         /**

          * Single construtctor of this class.

          * 

          * @param controller a {@link Controller}. It cannot be <code>null</code>.

          */

         @SuppressWarnings("unchecked")

         public ControllerGridDataSource(Class<T> clasz, ReadableController<T, K> controller) {

                 super(clasz, new ReadableControllerPagedSearch(controller));

         }

         final private static class ReadableControllerPagedSearch<T, K extends Serializable> implements

                         PagedSearch<T> {

                 final private ReadableController<T, K> controller;

                 /**

                  * Single constructor of this class.

                  * 

                  * @param controller a {@link Controller}. It cannot be null.

                  */

                 public ReadableControllerPagedSearch(ReadableController<T, K> controller) {

                         if (controller == null) {

                                 throw new IllegalArgumentException("Parameter controller cannot be null");

                         }

                         this.controller = controller;

                 }

                 public int count() {

                         return controller.countAll();

                 }

                 public List<T> search(int firstIndex, int maximumResults, SortCriterion... sortingConstraints) {

                         return controller.findAll(firstIndex, maximumResults, sortingConstraints);

                 }

         }

 }