// 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.selectmodel;

 import java.util.ArrayList;

 import java.util.List;

 import org.apache.tapestry5.OptionModel;

 import org.apache.tapestry5.SelectModel;

 import br.com.arsmachina.controller.Controller;

 import br.com.arsmachina.tapestrycrud.encoder.LabelEncoder;

 /**

  * Default {@link SingleTypeSelectModelFactory} implementation for entity classes. It uses

  * {@link Controller#}

  * 

  * @author Thiago H. de Paula Figueiredo

  * @param <T> the type related to this factory.

  */

 public class DefaultSingleTypeSelectModelFactory<T> implements SingleTypeSelectModelFactory<T> {

         private Controller<T, ?> controller;

         private LabelEncoder<T> labelEncoder;

         /**

          * Single constructor of this class.

          * 

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

          * @param encoder a {@link LabelEncoder}. It cannot be null.

          */

         @SuppressWarnings("unchecked")

         public DefaultSingleTypeSelectModelFactory(Controller<T, ?> controller,

                         LabelEncoder<T> labelEncoder) {

                 if (controller == null) {

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

                 }

                 if (labelEncoder == null) {

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

                 }

                 this.controller = controller;

                 this.labelEncoder = labelEncoder;

         }

         public SelectModel create(List<T> objects) {

                 if (objects == null) {

                         objects = controller.findAll();

                 }

                 List<OptionModel> options = new ArrayList<OptionModel>();

                 for (T object : objects) {

                         final String label = labelEncoder.toLabel(object);

                         options.add(new SimpleOptionModel(object, label));

                 }

                 return new SimpleSelectModel(options);

         }

 }